zondag 30 december 2012
Yesterday Oceans 5 dive resort organized another reef clean up. Instructor Phil, Divemaster Yvonne and Divemaster Trainee Budi took care of 7 other divers who wanted to help. The clean up started at 16.00. At that time the preparation started with preparing the bags, the gloves and all the equipment. At 16.30 Divemaster Yvonne gave a dive briefing about how everyone should take the rubbish away, the bottom time, the max depth and buddy teams. The first divers came after 44 minutes out of th water. They had 3 bags full of rubbish. After this each buddy team and the result was shocking...... After we had last time 15 bags of rubbish now the divers collected another 12 bags of rubbish! It looks a little bit better in the front of Oceans 5 dive resort, but still a lot of work has to be done. For further information about the reef clean ups: firstname.lastname@example.org
zaterdag 22 december 2012
It was time for their release. After being at Oceans 5 for 8 months these Hawksbill sea turtles were ready to return to their home, The Ocean. The people who were taking care of them, Nun, Uding and Bahry, helped to get the turtles to the beach. There they were released! Some of them were shy and didnt know what to do with their freedom, other enjoyed the first minute and run into the ocean as it was not new for them. A new adventure has started for them, they have to swimm and catch their own food. Hopefully we see them in the future underwater! Enjoy your stay turtles, see you soon.
woensdag 19 december 2012
Description All twenty-five species of trevally have elongated, compressed bodies and deeply forked caudal fins, with long, sickle shaped pectoral fins. The Giant Trevally (also known as the ulua, ronin jack and “GT”) is the most prized of the species by anglers and is identifiable by an ovoid patch of small scales located on the breast ahead of the ventral fins. Coloration for the Giant Trevally can range from silvery-white to almost jet-black. The Giant Trevally uses its superior swimming abilities and power to hunt and smash baitfish. The Giant Treavally is known for stunning prey with its first strike and then circling back to engulf the wounded and/or disoriented baitfish. They will usually devour the prey quickly with one bite, as competition can be fierce from other members of the pack. As they grow, larger specimens move to deeper water and congregate over coral reefs and other underwater structure. Giant Trevally also venture onto flats, headlands and shallow water to hunt food. Giant Trevallies can be found along the reef edge and points where large pounding swells crash on the reef and rocks stirring up food and creating the ideal environment to hunt. Pound for pound, these are among the hardest-fighting fish in the sea. The current record comes from a plug cast from shore in Japan. Fishing for trevally is best in hotspots like the Seychelles and the edge of the outside reef at Christmas Island, which is also a world-class bonefishing destination. Average Length 23 inches - 5 feet Average Weight 30 - 60 lbs Habitat The Giant Trevally ranges from estuaries to coral reefs. Juvenile fish are prevalent in estuaries and river systems. . Range Distribution is widespread. They’re found in the warm tropical waters of the Pacific and Indian Oceans as far south as New South Wales in Australia, east to the Hawaiian Islands, west to the eastern islands of Africa and north to Japan. You will find Giant trevallies on the dive sites around the Gili Islands. Specially Deep Turbo, Halik and Sharkpoint are famous for seeing the trevallies. . .
maandag 17 december 2012
Porcelain crab Neopetrolisthes maculatus These delicately spotted crabs live in a symbiotic relationship with anemones. They keep the anemone clean while benefiting from its protection. Porcelain crabs have modified mouthparts which open out like fans into the oncoming current in order to trap tiny particles of plankton . Life span They live for around 2-3 years. Statistics They are less than 24mm in width. Distribution They are found in the Indo-Pacific. You see them when you are diving around the Gili Islands Indonesia. Habitat They are also known as anemone crabs, due to their close association with anemones. Porcelain crabs may be found singly or in pairs, hidden between the stinging tentacles, or near the mouth, of anemones. They are found in reef habitats, to depths of around 10m. Diet They are mainly plankton feeders, sieving tiny particles from the water column using their fan-like mouthparts. They also eat mucus from the anemone. Behaviour Porcelain crabs are relatively aggressive, using their large claws to deter invaders, including anemone fish. Although both use an anemone host, porcelain crabs and anemone fish are not commonly found together, the crab usually losing out to the tougher fish. Like anemone fish, porcelain crabs are immune to the anemone's stinging tentacles. It is a mutualistic relationship, since both parties benefit from the arrangement: the crab gaining safety and shelter, in return for cleaning. Reproduction Porcelain crabs are often found in heterosexual pairs. They have internal fertilization, the male passing sperm to the female in the form of a tiny packet called a spermatophore. The eggs are carried by the female in a brood flap, on the abdomen. A single female may carry nearly 1,600 eggs at a time. The larvae are planktonic for several weeks before settling. Conservation status Porcelain crabs are not of the IUCN Red List, but suffer from habitat loss if reefs are damaged or polluted.
zondag 16 december 2012
Why Nitrox? Nitrox exposes you to less nitogen. This has the advantages of longer allowable bottom times, less need to push the air no decompression limits and less overall nitogen load when making multiple dives. Oceans 5 dive resort offers Nitrox course. They start every day. If you are 12 year old and older and you have an Open Water Certification you can begin. Enjoy the tast of Nitrox!
zaterdag 15 december 2012
TRUMPETFISH (Aulostomus chinensis) Also known as Trumpet, Atlantic Trumpetfish, Caribbean Trumpetfish, Trumpeter and Painted Flutemouth. You can find them everywhere around the Gili Islands when you are snorkeling or divinvg. The Trumpetfish can be recognised by its long body, tubular snout with minute teeth, its chin barbel and the series of short dorsal spines.Their bodies are inflexible, supported by interwoven struts of bone. The colouration of this species is variable. It is often brown or green with pale stripes and bars, and white spots posteriorly. A yellow colour variety is common in some areas. Individual fish have the ability to change their colours very quickly. Trumpetfish have the capability to rapidly expand their jaws into a circular gaping hole almost the diameter of their body when feeding. The trumpetfish is the true master-hunter on the coral reef. Yes, this fish looks rather benign and yes it is a relative of the passive sea horses, but it is truly a fish-killing machine! The trumpetfish employ a variety of strategies to capture their fish neighbors. One of the most spectacular is referred to by fish behaviorists as "hunting by riding" (a.k.a. shadow stalking). This is where the trumpetfish uses another fish as a blind to sneak-up on its unsuspecting quarry. The hunter-extraordinaire will lie along the back of the larger fish as the latter swims over the reef. The species that the trumpetfish uses as a blind are usually large herbivores (e.g., parrotfishes) or omnivores (e.g., angelfishes). Because these species don't cause small fish to flee (because they do not feed on them), the trumpetfish can hide behind them to get close. Once the distance between predator and its prey reaches a critical point, the trumpetfish will dart out from its living blind like an amphibious arrow! While it may look like the trumpetfish has a relatively small mouth, the floor of the narrow snout is very expandable, which enables it to distend so larger prey can pass into the stomach. If you see a trumpetfish while diving, stay back and watch it for a while. There is a good chance you will see it engage in this fascinating hunting behavior.
vrijdag 14 december 2012
There are a few different kinds of decompression stops/ pauses in ascent, which a scuba diver needs to make to allow for the expelling of inert gasses to minimize the possibility of the gasses forming micro-bubbles which in turn can cause Decompression Sickness or DCS. In this article we take a closer look at the Safety Stops. Safety Stop Every recreational scuba diver has been taught to perform safety stops while learning how to dive. A safety stop which is a 3 minute halt, assists the body in rapidly eliminating nitrogen. Even a diver that has remained within Decompression Limits is susceptible to bubbling on ascent and the safety stop helps mitigate the chances of this happening by speeding up the off-gassing process. A diver that performs a 3 minute safety stop after a dive will have less nitrogen in their body immediately upon surfacing as compared to a diver that did not perform a safety stop, but has been on the surface “off-gassing” for 3 minutes. Therefore, no matter whether the dive is within NDL’s or not a safety stop is highly beneficial on any dive. All dive computers prompt divers either with an audible alarm or through the display the when they should perform the stop, and provide a count-down of 3 minutes. If you dive without a computer, make sure you have a wrist watch or timer with you to ensure you spend the correct amount of time at this stop. There are still a few divers that choose to ignore the safety stop when they have not gone in deco, claiming that the safety stop is not mandatory but only precautionary. One should still always observe the safety stop if they have sufficient air, as this is highly beneficial in helping the body “off-gas” and minimize the risk of DCS. Rules of RDP: Safety stop required: 1) diving 30 meters or deeper. 2) hitting the no decompression limits. 3) ending pressure group of your planned dive is within 3 pressure groups of the no deceompression limit. Oceans 5 advice, make after every dive a safety stop, it is just good dive behavior.
donderdag 13 december 2012
What is coral bleaching? A coral colony is made up of numerous individual coral polyps. Corals use their tentacles to feed on zooplankton, but depend primarily on microscopic, algae known as zooxanthellae located inside their tissues to provide them with food. Corals are very dependent on this symbiotic relationship, receiving up to 90% of their energy from the zooxanthellae. Healthy corals usually appear tan, brown or green from the presence of the algae within their tissues. Some types of corals have additional pigments so may appear more blue or purple. Coral bleaching is a stress response that occurs when the coral-algae symbiotic relationship breaks down. The term “bleaching’ describes the loss of color that results when zooxanthellae are expelled from the coral polyps or when chlorophyll within the algae are degraded. When the zooxanthellae leave the coral, the white of the coral skeleton is then clearly visible through the transparent coral tissue, making the coral appear bright white or ‘bleached’. Some corals, such as our lobe coral, have additional pigments in their tissue, so when they ‘bleach’ they may turn a pastel shade of yellow, blue or pink rather than bright white. What causes coral bleaching? Coral bleaching can be caused by a wide range of environmental stressors such as pollution, oil spills, increased sedimentation, changes in salinity, low oxygen, or disease. However, the primary cause of mass coral bleaching is increased sea temperatures. Corals are very sensitive animals so water temperatures need only increase 1-2 degrees Celsius above normal levels for bleaching to occur. The corals are still alive after bleaching but begin to starve. Most corals struggle to survive without their zooxanthellae. If the stressful conditions return to normal rather quickly, the corals can regain or regrow their zooxanthellae and survive. If the stressors are prolonged, the corals are more susceptible to disease, predation, and death because they are without an important energy source. Not all corals are equally susceptible to bleaching. Fast-growing branching and plate corals are often the first to bleach and are more likely to die from bleaching. Slower growing massive corals usually take longer to bleach and tend to be able to survive for longer in the bleached state. Past, Present… Future? Localized coral bleaching has been recorded for over 100 years but only in the last 20 years have we seen mass coral bleaching events. Mass bleaching has now affected every reef region in the world. A particularly severe worldwide bleaching event occurred in 1998, effectively destroying 16 percent of the world’s reefs. When coral bleaching causes extensive death of corals, recovery is very slow and dependent on new, young corals (called recruits) settling and growing on the reef. Regrowth of reefs that have been severely damaged by bleaching may take decades. Recovery is especially difficult for reefs in locations suffering from other stresses such as pollution, overfishing or other chronic pressures. The last coral bleaching event was in 2010 around the Gili Islands. A lot of corals specially in the shallow parts of Hans Reef, Halik and around Villa Ombak were highly affected. Coral bleaching is predicted to occur much more frequently due to higher sea temperatures associated with global climate change. Human populations continue to grow placing more and more stress on the coral reefs. The time to protect our reefs is NOW before these valuable resources are lost forever.
vrijdag 7 december 2012
When you are diving around the Gili Island you will spot them on every dive site. Some people loves them other one say this one of the most ugly fish in the sea. We are talking about the Parrotfish. This herbivorous fish uses its strong beak-like mouthparts to scrape algae and other plant matter from the surface of the coral. This maintains the health of the reef by keeping algae in check, which could otherwise overwhelm the delicate reef ecosystem. An unusual feature of parrotfishes is that they are able to change sex, with females becoming fully functional males. In a population, parrotfish start off as either females or males (known as primary males). Females may at some point in their life become male (secondary males). Populations that have these two types of males are called ‘diandrous’, meaning ‘two-males'. A terminal phase male defends a territory and a harem of females. If the male should die, the most dominant female will become the dominant male, her ovaries becoming functional male testes. The parrotfish occurs in the western Atlantic, from Florida, Bermuda and the Bahamas to Argentina and the Gili Islands Indonesia. Associated with coral reefs at depths of 3 to 25 metres. At night, parrotfish retreat into crevices. Juveniles tend to occur in mangroves adjacent to the reef. The mangroves act as important nursery areas and provide food-rich and predator free safe-havens for the growing young.
donderdag 22 november 2012
Porcupinefishes are on every dive site around the Gili Islands. You will find the for example when you are diving North Gili Air, on Hans reef. But is the Porcupinefish the same fish as a Puffer fish? Porcupinefishes are similar to puffer with regards to their ability to inflate by drawing water into the addomen. They have additional protection in the form of sharp spines on the head and body. These are either three rooted or non movable as seen in the burrfishes or two rooted and erectile in Diodon. In the genus Lophodiodon both types of spines are evident on the same individual. Typically the spines of Diodon lie flat against the body with their tips directed posteriously, but if theatened the body is expanded and the spines are erected approximately perpendicular to the body surface, forming an obvious deterrent to potential predators. Porcupinefishes and burrfishes further differ from puffers in having broader pectoral fins, in lacking a median suture on their dental plates and having larger eyes. Most are nocturnally active, usually hidden in caves or beneath ledges during daylight hours. Their strong dental plates and powerful jaws are well suited for crushing the hard outer shell or test of sea urchins, gastropod molluscs and hermit crabs as well as exoskeleton of crabs. Care should be exercised when handling these fishes because of their obvious spines and capability of inflicting severe bites. They are also reports of poisoning due to people eating diodontid fishes presumably from tetrodotoxin but they can also cause ciguatera. The Family contains 6 genera and 19 species which occur in all tropical subtropical and warm temperate seas.
woensdag 21 november 2012
A lot of times you see them around when you are diving Sharkpoint, Gili Trawangan or Bounty Wreck, Gili Meno. Its the Batfish. They are so common when and we see then so many times around the Gili Islands, but what do we know about them? Batfishes are recognisable on the basis of their distinctive shape, particulary juveniles, which have greatly elevated dorsal and anal fins. Other characteristics include a small, terminally located mouth, brush like jaw teeth (often with tricuspid lips), a continuous dorsal fin with 5-9 spines and 19-40 soft rays, anal fin with 3 spines and 17-29 rays, and typically a silvery adult colour pattern often with dark bars on the head and body. Members of the genus Platax are extremely tame and curious, often approaching divers at close range. Young fish are found close to the bottom, often around boat moorings, docks, jetties, and floating objects. Adults may form midwater feeding aggregation, frequently adjacent to steep outer reef slopes. The diet consists largely of benthic invertibrates and zooplankton. In their natural habitat the young of P. orbicularis mimic dead leaves, and those of P. pinnatus mimic toxic polyclad flatworms that are nearly identical in colour and shape.
dinsdag 20 november 2012
Diving around the Gili Islands gives you the oppurtunity to see unusual fish, like the Razor fish. You will find the in the harbor of Gili Air, in the front of Oceans 5 dive resort. These are small, unusually shaped fish that are related to pipefish and seahorses. They are characterised by an extremely thin or flattenend and nearly transparent body, which is encased in an integument of thin, sutured plates. The unusual appearance is further enhanced by their peculiar vertical orientation with the snout pointing downwards. However they are capable of rapid bursts of horizontal swimming when chased by a diver or preditor. Razor fish often occur in large synchronised groups, sometimes containing more than 50 individuals. The family is restricted to the tropical Indo Pacific region and contains two genera and four species, 3 of which occur in the East Indian region. The fish's diet consists of a variety of zoo-plankton and minute crustaceans. When in captivity, it is fed bait shrimp and a variety of small, live marine food. It swallows its food whole. This fish, like its closest relative, the seahorse, is toothless. As a young fish, it is prey to many larger fish. As an adult, however, the fish is thought to have little, if any, predators. This is thought to be because of its great camouflage and its "armor". The life span of the fish, unlike the reproduction method, is unknown. Maximium size to about 14 cm. Pale yellowish brown on the back and white on lower half with dark brown to black stripe from snout, through eye, to base of caudal fin. Sometimes seeks refuge among sea urchin spines.
vrijdag 16 november 2012
Sea snakes are venomous reptiles that live most or all of their lives in the sea. They're so adapted to life in the ocean that few species can crawl on land. They swim like eels with their paddle-like tail and laterally compressed body. Like marine mammals, they lack gills and must come to the surface to breathe. Sea-snakes are cold-blooded reptiles, so they live mostly in warm tropical waters, like the Gili Islands. During the diving around the Gilis you will meet some Sea snakes. Sea snakes are fully adapted to breathe, feed, breed and grow in the sea. For air-breathing animals, sea-snakes are remarkable divers. Some species can dive to 100 metres or more, and remain submerged for up to 80 minutes. This may be partly due to the remarkable ability of some species to absorb part of the oxygen they need through their skins. Their nostrils have valves that close when they are under the water. Sea snakes inject venom with their bites to subdue and kill prey, which is then grabbed in the jaws and swallowed whole. As with other snakes, the skullbones of sea-snakes are loosely attached and they can dislocate their lower jaws and slide them sideways to allowing them to swallow very large prey. Sea-snakes tend to be fussy eaters. Some only eat catfish, another only eats the eggs of two families of fish. Others dine on eels, fish, prawns, crabs and worms. Sea snake venom is among the most venomous of all snakes, yet sea snakes rarely inject enough venom to significantly harm a person. In fact, very few human deaths from sea snakes have been reported. They prey mainly on fish and other sea creatures. Sea snake venom has properties that may one day help in surgeries. Scientists are currently researching whether sea snake venom can be used as an anesthetic. Female sea snakes sometimes attract attention from more than one suitor and mate in the open water. They give birth to live young at sea. The mother then leaves the young to fend for themselves. No species of sea snakes are listed as threatened, although the distribution and status of most species is not very well known.
donderdag 8 november 2012
Sharkpoint, West Gili Trawangan, Indonesia is one of the most exciting divesites around the Gili Islands. It takes 30 minutes by boat from Oceans 5 dive resort to get there. The main attraction are the White Tip Reef Sharks. You will find them between the 20 and 30 meters in the sandy patches between the reefs, mostly sleeping. Description and Behavior Whitetip reef sharks, Trianodon obesus, are a slender species with a short, blunt snout. They are brown-gray on their dorsal (top) sides, white on their ventral (lower) sides. They have scattered dark gray spots along the sides of their bodies. The tips of their first dorsal fin and upper caudal (tail) fin lobe are brilliant white. The tip of their second dorsal fin and lower caudal fin lobe are also white in some animals. Spiracles usually present, teeth are tricuspidate (three-pronged, with a smaller secondary cusp on either side of the central blade) numbering 47-50 upper/44-46 lower jaw, in at least 2 functional rows. This species is reported to grow to 2.3 meters in length but adults over 1.6 meters long are rarely seen. Maximum published weight is 18 kg and the maximum reported age is 25 years. World Range and Habitat Whitetip reef sharks are found in tropical marine waters, are most abundant on the fore-reef, and during daylight hours are often associated with coral reefs or lying on the bottom in caves and under ledges. Individuals often return to favored resting sites at the same times each day, often for several years. Highly social, these sharks often lie together in groups on the bottom, stretched out side-by-side and even stacked like chord wood. Home ranges of individuals are very small, typically only 0.5 km² or so. In Australia they are recorded from northwestern Australia, around the tropical north and south to the Queensland coast. They are one of the most abundant species found near coral reefs, together with blacktip reef sharks, Carcharhinus melanopterus, and gray reef sharks, C. amblyrhynchos. They prefer shallow water, but have been found down to 330 m. These sharks live near the bottom or in caves and crevices. Compared to typical reef sharks (requiem sharks), this species swims in a more undulating manner. They are primarily nocturnal, but seem to be correlated with tidal ranges. They can be found in the same area for months (a few square kilometers) but territoriality is not known. They are sluggish inhabitants of lagoons and seaward reefs where they are often found resting in caves or under coral ledges during the day, or usually on a sand patch, or in a channel. They are more active at night or during slack tide in areas of strong currents. They are known to travel distances from about 0.3-3 km in periods up to about 1 year. Feeding Behavior (Ecology) Whitetip reef sharks feed nocturnally on benthic animals such as fishes, octopuses, spiny lobsters, and crabs. They have been observed feeding cooperatively at night at Cocos Island, Costa Rica, moving over the reef face like a phalanx of soldiers, flushing out sleeping prey. Foraging individuals often pause to wriggle their elongate bodies into crevices and under coral heads, twisting and turning violently and often breaking off coral and tearing their fins and skin. As such, the whitetip reef shark occupies a niche more like that of a moray eel than a typical shark. Life History One to five 60 cm young per litter. Mode: dioecism. Fertilization: internal (oviduct). Reproductive guild: internal live bearers. Description of life cycle and mating behavior: Viviparous, with 1-5 young per litter. Gestation is about 12 months. Size at birth 52-60 cm total length. Distinct pairing with embrace. One to 11 males follow a female until one gently nips her gill region; if she accepts him, he grasps one of her pectoral fins in his mouth and mates with her, their heads close together on the bottom and their bodies entwined and extending up into the water column at an angle of about 45 degrees. Mating typically lasts 1.5 to 3 minutes. They reach sexual maturity at an age of about 8 years and a length of about 1 m (males and females). Size at birth 52-60 cm total length. Conservation Status and Comments Check the Conservation Status of Whitetip Reef Sharks Note: if there are no entries found, it only means that this species has not yet been evaluated. The whitetip reef shark is a curious species that often approaches divers. It is not considered dangerous to humans. Its restricted habitat, depth range, small litter size and moderately late age at maturity suggest that, with increasing fishing pressure, this species may become threatened . Rarely reported to attack humans, but is potentially dangerous, particularly when when fish have been speared. Probably fished wherever it occurs (no data). Meat and liver utilized fresh for human consumption. The liver of this shark has been reported as toxic.
zaterdag 3 november 2012
The moray eel is a large species of eel found in warm and temperate waters all around the world. They are also around the Gili Islands. Despite their snake-like appearance, moray eels (along with other eel species) are in fact fish and not reptiles. Moray eels are found in both deep and shallow waters in tropical and sub-tropical regions. Although moray eels can be find in cooler waters occasionally, they tend to remain in the crevices deep in the ocean rather than venturing into shore. The largest populations of moray eels are found around tropical coral reefs where they are numerous different marine species found in large numbers. Specially when you are diving the dive sites around the Gili Islands named Halik, Hans and Bounty wreck you will see them. There are around 200 different species of moray eel than can range in size from just 10cm long to nearly 2 meters in length. Despite their varying size and colour all moray eels are fairly similar in appearance with an elongated body, slightly flattened towards the tail. Moray eels also have large eyes and mouths which contain large teeth. The moray eel is a relatively secretive animal, spending much of its time hiding in holes and crevices amongst the rocks and coral on the ocean floor. By spending the majority of their time hiding, moray eels are able to remain out of sight from predators and are also able to ambush any unsuspecting prey that passes. Like many other large fish, the moray eel is a carnivorous animal surviving on a diet that consists of only meat. Fish, molluscs including squid and cuttlefish and crustaceans such as crabs are the main source of food for the moray eel. The moray eel is often one of the most dominant predators within its environment but moray eels are hunting by some other animals including other large fish like grouper and barracuda, sharks and humans. Moray eels tend to mate when the water is warmest towards the end of the summer. Moray eel fertilisation is oviparous, meaning that eggs and sperm are fertilised outside of the womb, in the surrounding water, which is known as spawning. More than 10,000 eggs can be released at a time, which develop into larvae and become part of the plankton. It can take up to year for the moray eel larvae to have grown big enough to swim down to the ocean floor to join the community below
donderdag 1 november 2012
Today day 2 starts of the Padi instructor examination (IE) starts at Gili Air. Today it is only the confined water presentations. Oceans 5 candidates are making themselves ready for the final presentation. In a few hours we know more about the candidates. Hopefully we can tell you they all passed! For more information to become an instructor: http://www.indonesia-idc.com
woensdag 31 oktober 2012
After a successfull Instructor development course (IDC) at Oceans 5 Gili Air, the IDC candidates Paden, Dan, Florence and David have to show today and tomorrow what they have learned during the IDC. The Instructor Examination (IE) is over 2 days. Today the orientation, exames, classroom presentation and open water takes place. Tomorrow the final day there is only confined open water presentations. If all the candidates pass there will be a biug party in the Zipp Bar, Gili Air. This will start at 8 o'clock in the evening. But at this moment dont look at this, we have to start and pass firts. For further information: http://wwww.oceans5dive.com
dinsdag 30 oktober 2012
When you are diving around the Gili Islands you have a chance to see at the divesites Sharkpoint, Hans or Halik the Barracuda. Also in the evenings when you pass all the BBQ places for dinner, the barracuda is one of the most seen dishes. But how does it looks like? Description The great barracuda has a slender, streamlined body that is round in the mid-section. The top of the head between the eyes is nearly flat and the mouth is large, containing many large sharp teeth and a projecting lower jaw. The pectoral fin tips extend to the origin of the pelvic fins. The spinous and soft dorsal fins are widely separated and the double emarginate tail fin exhibits pale tips on each lobe. Body coloration of the great barracuda is brownish or bluish gray on the dorsum and upper side, with a greenish cast shading to silvery on the sides and a white belly. The upper side may have 18-23 dark bars most often observable when the fish is resting or over a variegated substrate. The black spots on the lower sides of the great barracuda distinguish it from other species of barracuda. The second dorsal fin, anal, and caudal fins are violet to black with whitish tips. Young barracuda exhibit pale reticulations on the dorsum and a dark stripe on either side that breaks into spots as the fish grows. These patterns are somewhat ephemeral though as juveniles can alter their color patterns to closely match that of their surroundings. These changes in coloration serve to camouflage the fish from predators as well as well as wary prey. Adults have similar coloration along with a more silvery appearance that is advantageous to a fish that swims near the surface of the water. Habitat Great barracuda commonly occur in nearshore coral reefs, seagrasses, and mangroves. They may also reside in the open ocean, living predominantly at or near the surface, although they are at times found at depths to 100 meters. Barracudas tend to be solitary but are sometimes found in small aggregations over reefs and sandy bottoms. Juveniles mature amongst mangroves and seagrass beds, habitats that offer cover from predators. During the second year of life, barracuda move to deeper reef habitats. Juveniles and some adults have been observed in areas that receive high amounts of freshwater input, however adults generally tend to avoid areas of brackish water. Diet Great barracudas feed on an array of prey including fishes such as jacks, grunts, groupers, snappers, small tunas, mullets, killifishes, herrings, and anchovies. Barracudas have a large gape and very sharp teeth, enabling them to feed on large fishes by chopping them in half. An opportunistic predator, great barracuda feed throughout the water column. Generally a diurnal fish, great barracuda locate their prey largely by sight. The body plan of the great barracuda is designed for speed and it is estimated that top speed for the species may be as fast as 60 km/h. Fishery Although not prized as a commercial fish in North American waters, the great barracuda puts up a good fight and is therefore esteemed by some anglers as a gamefish. They may be caught with a variety of gear including handlines, rod and reel, seines, trammel nets, and gill nets. The great barracuda has been implicated in cases of ciguatera poisoning within certain areas of its range. Ciguatera poisoning is caused by the bioaccumulation of ciguatoxins in the flesh of tropical marine fishes. Ciguatoxins are produced by marine dinoflagellates that grow attached to marine algae and as such may be incidentally ingested by herbivorous fishes. Large piscivorous reef dwelling fishes occupying the apex of the food chain become reservoirs for the highest amounts of ciguatoxin by feeding on other members of the reef community. Poisoned people report gastrointestinal maladies that may last several days, a general weakness in their arms and legs, and a reversal in the ability to differentiate hot versus cold. The illness is serious and symptoms may persist for weeks. Size Great barracuda are large fish. The record for a hook and line caught great barracuda is 1.7 meters, 44 kg and the species is reported to attain a size of 2 meters, 50 kg. Any barracuda over 4.8 feet (1.5 m) in length can be considered very large. Based on scale analysis of large specimens, great barracuda have a lifespan of at least 14 years. Sexual maturity is reached at a length of about 60 cm. Range Occurring worldwide in near shore tropical and subtropical seas (30°N - 30°S), the great barracuda is common in the western Atlantic Ocean from Massachusetts (U.S.) to Brazil. It is also found in the Gulf of Mexico and the Caribbean Sea as well as the eastern Atlantic Ocean, Indo-Pacific, and the Red Sea. It is rare or absent in areas of the eastern Pacific Ocean. For mor information: http://www.oceans5dive.com
maandag 29 oktober 2012
Today it is the last day of the Padi Instructor development course (IDC) at Oceans 5 dive resort. After 10 days the candidates are glad they will have tomorrow a day off before the Padi Instructor Examination (IE) starts. During the IDC the candidates were trained to do confined presentations, open water presentations and classroom presentations. Also they improved their diving and their dive theory skills. In the spare time they had, they did the MSDT preparation course with Platinum Padi Course Director Camille Lemmens. They became Padi specialty instructor in Deep, Enriched Air, Dugital Underwater Photography (DUP), Night and Oxygen provider. Florence, David, Paden and Dan have done a great job during these days. And they are looking forward when the IE is over. Then the Party will start....
zondag 28 oktober 2012
A scorpion fish is a group of predatory, marine fish that are found amongst coral reefs and in shallow waters in the more temperate oceans. The scorpion fish is most closely related to the lionfish and is most commonly found in the Indian and South Pacific oceans. You can find them if you dive around the Gili Islands at the dive sites Hans reef, Halik and the Bounty. Oceans 5 dive resort finds almost every dive a scorpion fish. There are more than 200 recognised species of scorpion fish, hiding amongst the ocean reefs and in artificial aquariums around the world. Scorpion fish are kept in tanks by numerous people because of their interesting appearance and behaviour. The body of the scorpion fish is often cover in feathery fins that help the scorpion fish to camouflage itself into the surrounding coral. The colours and markings of the scorpion fish are also used to help the scorpion fish to hide. Scorpion fish are nocturnal predators, and spend the daylight hours resting in a hidden crevice in the coral. Scorpion fish are also able to ambush their prey from this position and often catch small fish by surprise. Scorpion fish are omnivorous fish and hunt small fish, crustaceans and snails on the coral reefs. Scorpion fish are able to stun their prey with their venom before eating it. Scorpion fish also use their venomous sting to fend off unwanted predators. The scorpion fish is a very dominant predator in it's environment, and therefore the scorpion fish has very few natural predators. The human catching the scorpion fish to keep in tanks is the biggest threat to the scorpion fish along with habitat loss from the destruction of coral reefs. Large fish and sea lions are also known to hunt scorpion fish. The female scorpion fish releases between 2,000 and 15,000 eggs into the water which are fertilised by the male scorpion fish. The scorpion fish pair then quickly hide so that their eggs can float into the ocean before being spotted by predators that eat the eggs. The scorpion fish eggs hatch in just 2 days and the tiny scorpion fish fry remain near the surface of the water until they are bigger. When the scorpion fish fry reach nearly an inch in length, they swim down into the ocean to join the reef community.
zaterdag 27 oktober 2012
The Damselfish are quite lively and colorful and they are common in the tropical seas. They are found in the shallow water of tropical and semitropical seas, like diving around the Gili Islands and at the divesites Halik (North Gili Trawangan), Hans reef (North Gili Air) and Bounty Wreck (South West Gili Meno). They are small and aggressive. They love the coral reefs, mangroves and sea grass. They feed on zooplankton and algae. When they are in courtship, they make purring and clicking noises. The juveniles are different in color than the mature adults. Some juveniles may be red with blue spots. The mature ones are orange-yellow. They can display a ferocious behavior when they feel threatened. Some like to live in open water and swim in schools. These fish are beautiful as the display their bright colors. Many of the Damselfish grow to a length of 7 cm. They become mature in two to five years. Some species may take much longer to mature. Their spawning season begins in spring and ends in the summer. There are a few different species and some species swim in large schools. There are about 235 species of Damselfish, and that includes about 26 species of Clownfish. Habitat destruction and the destruction of the coral reefs may soon show declining populations. The young Blue Damselfish can live together in peace, but they become very aggressive as they mature. They like to stay very close to the coral reef. The Black and White Damselfish are also called Humbug fish. The Yellowtail Damselfish often lose their beautiful bright colors when they are captured. Some species of Damselfish can only be found in the Caribbean. Some species only live on the bottom of the sea and they defend their territory of about 16 feet. This territory covers feedinmg, spawning and shelter sites. The Damselfish ignores bass and groupers because they are much less competitive. It is the male that prepares for spawning by clearing a surafce of coral or rocky ledge. The female can lay up to about 20,000 oval eggs that are really tiny. The males guards these eggs with his fins. It takes the eggs about three to seven days to hatch. If you like more information about diving around the Gili Islands visit our website: http//:www.oceans5dive.com
vrijdag 26 oktober 2012
dinsdag 23 oktober 2012
The Padi instructor development course (IDC) at Oceans 5 dive resort has started. The 4 candidates arrived the 17th of October and started straight away with their IDC preparation course. The IDC preparation course will brush your diving and dive theory skills till instructor level. Normally it takes 2-3 days. After the first days of the IDC there was a specialty instructor break. The candidates did 4 specialties Enriched Air, Digital Underwater Photography, Deep and Oxigen Provider. It took place over 3 days. Today its time for their first classroom presentation. Well David, Paden, Florence, and Dan have some fun.....
woensdag 17 oktober 2012
It was Wednesday yesterday. Time for our weekly reef and beach clean up! This time all the Padi instructor development (IDC) candidates, all our divemaster trainees, fundivers and staff were joining the clean up. The clean up started at 16.00. Everyone was prepareing his/her equipment and all went in the water in front of Oceans 5 dive resort. The clean up dives takes maximum 60 minutes. But after 10 minutes the first divers cam at shore with bags full of rubbish. The end result was 10 bags full of pklastic, can, ropes etc.... Oceans 5 likes to thank everyone who joined the clean up. Lets make the world a little bit better and dont forget fish dont like plastic!
dinsdag 16 oktober 2012
When you are diving around the Gili Islands with Oceans 5 you will meet a lot of puffer fish in all kind of sizes. Normally the diver doesnt see that the puffer fish blows themselves up. Biologists think pufferfish, also known as blowfish, developed their famous “inflatability” because their slow, somewhat clumsy swimming style makes them vulnerable to predators. In lieu of escape, pufferfish use their highly elastic stomachs and the ability to quickly ingest huge amounts of water (and even air when necessary) to turn themselves into a virtually inedible ball several times their normal size. Some species also have spines on their skin to make them even less palatable. A predator that manages to snag a puffer before it inflates won’t feel lucky for long. Almost all pufferfish contain tetrodotoxin, a substance that makes them foul tasting and often lethal to fish. To humans, tetrodotoxin is deadly, up to 1,200 times more poisonous than cyanide. There is enough toxin in one pufferfish to kill 30 adult humans, and there is no known antidote. Amazingly, the meat of some pufferfish is considered a delicacy. Called fugu in Japan, it is extremely expensive and only prepared by trained, licensed chefs who know that one bad cut means almost certain death for a customer. In fact, many such deaths occur annually. There are more than 120 species of pufferfish worldwide. Most are found in tropical and subtropical ocean waters, but some species live in brackish and even fresh water. They have long, tapered bodies with bulbous heads. Some wear wild markings and colors to advertise their toxicity, while others have more muted or cryptic coloring to blend in with their environment. They range in size from the 1-inch-long (2.5-centimeter-long) dwarf or pygmy puffer to the freshwater giant puffer, which can grow to more than 2 feet (61 centimeters) in length. They are scaleless fish and usually have rough to spiky skin. All have four teeth that are fused together into a beak-like form. The diet of the pufferfish includes mostly invertebrates and algae. Large specimens will even crack open and eat clams, mussels, and shellfish with their hard beaks. Poisonous puffers are believed to synthesize their deadly toxin from the bacteria in the animals they eat. Some species of pufferfish are considered vulnerable due to pollution, habitat loss, and overfishing, but most populations are considered stable. Oceans 5 dive resort organises marine biology classes for evewryone who is interested, divers as non-divers. For more information: email@example.com
maandag 15 oktober 2012
Mandarin fish The Mandarin fish is a beautiful colourful fish. Oceans 5 dive resort is lucky to have 20-30 pieces of them in front of their House reef. But what do we know about them? Design The mandarinfish produces a thick mucous that covers its body. This mucous smells bad and tastes bitter. Scientists believe that this secretion could ward off potential predators. The bright colors of this fish could also give warning of its toxicity. These features may not have served this purpose until after the Fall of man since before the Fall all animals were vegetarian. Features ■ The mandaranfish is distinguished by its bright colors and unusual shape. ■ Its body is primarily blue with orange, red, and yellow wavy lines. Fun Facts ■ The mandarinfish does not have scales; instead it produces a stinky mucous that covers its body. ■ This fish is also called the mandarin dragonet. ■ Mating between mandarinfish involves a ritualized dance. ■ This is a very popular aquarium fish exported from the Philippines. CLASS: Actinopterygii (ray-finned fishes) ORDER: Perciformes (perch-like fishes) FAMILY: Callionymidae (dragonets) GENUS/SPECIES: Synchiropus splendidus Size: Up to 6 cm in Depth: Found at depths up to 18 meters Habitat: Western Pacific tropical waters of the Philippines, Indonesia, Hong Kong, Australia, New Guinea, and the Ryukyu Islands in coral reefs and shallow lagoons If you like to see the around the Gili Islands, and you like to dive with them, contact us, firstname.lastname@example.org
zondag 14 oktober 2012
The Ornate Ghostpipefish is an unually shaped species that occurs in tropical and warm termperate waters of the Indo-west Pacific. Identification The Ornate Ghostpipefish can be recognised by its distinctive body form with slender appendages on the body and fins. It has deeply incised membranes in the dorsal, caudal and ventral fins. Its colour varies from almost totally black to semi-transparent with red, yellow, and white scribbling, spots and blotches. Size range The species grows to 10 cm in length. Similar Species Ghostpipefishes are different to seahorses in several ways. A ghostpipefish’s head is held at an angle to the body, but not at such a large angle as that of the seahorse. Ghostpipefishes have two dorsal fins whereas a seahorse only has one. In addiction, ghostpipefishes do not have a pouch in which the young are reared, instead a female ghostpipefish (rather than the male seahorse) looks after the eggs in a pouch formed by her modified ventral fins. These fins are greatly expanded and united with the abdomen along the upper margin and together below for a brood pouch. Distribution It has a widespread distribution in tropical waters of the Indian and western Pacific Oceans. The Ornate Ghostpipefish is usually solitary, but has also been observed in pairs or small groups. Here around the Gili Island you will see Ornate Ghostpipe fish at Hans Reefs, Bounty wreck, Teluk Nara, Oceans 5 house reef and Mentiggi bay. You can find all the different colours and sizes. Most of the times they are in shallow waters. For more information about fish, Oceans 5 dive resort organises marine biology classes, email@example.com
zondag 7 oktober 2012
Ribbon Eel, (Rhinomuraena quaesita) When you are diving with Oceans 5 Mentiggi Bay, Lombok, you will see in the shallows these smaller black/white or medium sized blue/yellow or large yellow eels sitting in holes and moving the head up and down with jerky movements. Are they 3 different species? Nope. All the same! How come? Well, the male ribbon eel does not only change colours when growing up, but it changes as well sex when turning into a large yellow female! This really funky and curious animal can be lured out of its whole by moving a stick in front of it. When leaving the hole, the diver can see where the name comes from - this fish looks like a long ribbon and grows up to 1.5 m long. Isnt it amazing?
maandag 10 september 2012
Today the Padi business academy in Bali has started. It is the second time that Padi visit Bali with a business academy. The Padi business academy is a 2 days programme. During these days the participants will learn more about business positioning, marketing, e-marketing and social marketing. It is not only a programme where the participants have to listen but there are workshops where they can integrate the information they just have learned. Oceans 5 dive resort is joining the programme. Sander wants to upgrade his knowledge about e-marketing and websites.
vrijdag 7 september 2012
Oceans 5 Gili Air has certified some of their staff as Emergency First Responder (EFR). After 4 days of theory and skills 3 staff member can call themselves Emergency First Responder. So my name is Hamdi, Habibi and Acok, i am an Emergency First Responder! May i help you. Well done guys!!!!
donderdag 6 september 2012
Oceans 5 dive resort is following the latest trends of diving. In the beginning of October 2012 Oceans 5 dive resort will be ready to teach sidemounting around the Gili Islands. They will be the first or one of the first who are cabable to teach sidemounting arounf the famous Gili Islands. Oceans 5 ordered just 2 Hollis sms50 sidemount systems. And if we like them more will follow. What is sidemount scuba diving..? Diving in sidemount configuration is the process of taking one or two cylinders and placing them on either side of your body, rather than mounting them on your back, (traditionally known as backmounted). But Sidemount diving is much more than just a change in equipment. In fact, with the right training, you will find it to be a vastly more rewarding and enlightening experience. If fact if trained correctly I doubt, you will ever see the need to return to a backmouted equipment configuration. Why use sidemount equipment configuration vs backmount..? * Enables a unique method of buoyancy control which results in a more streamlined profile, reduces drag and makes finning and moving through the water much easier and more efficient. Get as close to the free-diver experience as possible with Scuba! * Offers a greater comfort level. Sidemount equipment and harness are custom fit to each individual, accommodating divers of all shapes and sizes. * Great for divers with any disabilities, as you carry the cylinder(s) separate from your harness to the water. Cylinders and weights are then mounted and attached in the water, making the entries and exits to dive sites much easier. * The safest option in terms of air management. Sidemount allows provides you with easier access to your cylinder valve(s), first stage(s) and alternate air source should a problem arise. One harness and BCD does it all! This statement is now 100% true! Your Sidemount equipment can also be used for more advanced types of diving i.e wreck, technical and cave diving, providing you get trained correctly at each level. If you like to have more information about sidemounting around the Gili Islands: http://www.oceans5dive.com or firstname.lastname@example.org
woensdag 5 september 2012
Diving around the Gili Islands is fantastic. To make your dives more joyable and to make you more aware about what garbage, rubbish can do with the underwater world, Oceans 5 organise every week beach and reef clean ups. In the last few months we collected a lot of rubbish. And at his time we see more marinelife than before. A few days ago we spotted a white tip reef shark, a wonderpus and a few robust pipefish in the harbor. We are really happy that all our work and time results in a better reef and a broader awareness of reef conservation on the island. But we are not there, there are many things that we individually can do! We can as divers create a good dive behavior, not touching and taking things away. We can improve our bouyancy. But even as a non diver you can help us to take some batteries we have back to the western world where they recycle them. If you like to know more about Gili Air, eco projects or clean ups: email@example.com
dinsdag 4 september 2012
Last week 5 candidates finished their Emergency First Response Instructor (EFRI) course here at Oceans 5 dive resort on Gili Air, Gili Islands, Indonesia. The EFR Instructor courses at Oceans 5 dive resort are run throughout the year when demand dictates. Courses takes 1 or 2 days and includes all elements of primary and secondary care, use of the AED, the provision of Oxygen and Care for Children. This course is open to anyone who has the provider qualifications. There is no requirement to be a diving instructor to undertake this training course. Prerequisites: To enter the Emergency First Response Instructor course, you must be 18 years old and have completed adult, child and infant CPR and first aid training in the past 24 months or a be a practicing medical professional such as a physician, Emergency Medical Technician, Paramedic and Registered Nurse. If you like to have more information about EFR instructor courses, EFR courses, or EFR update programes please contact us: firstname.lastname@example.org
maandag 3 september 2012
It were busy times the last few week at the Gili Islands. So didnt had time to write about the weekly beach and reef clean ups at Oceans 5 dive resort. But even during the high season there were beach and reef clean ups. The result is there! The reef in front of Oceans 5 dive resort has a lot of nice creatures. Yesterday we saw during a divemaster trainee workshop 2 times a wonderpus totally free. But if you like seahorses, pipefish, gurnets, all kind of lionfish, some nudis or flatworms, the Oceans 5 house reef is a great one to dive. Oceans 5 like to thank Peter and Daniel who organised all the clean up during high season. But we dont want to forget all the people who joined and helped us to get a better and cleaner reef! Thank You!!!!
zaterdag 1 september 2012
The Padi instructor examination (IE) is over! All 9 candidates are Padi dive instructors! There will be 7 new dive instructors on Gili Air (Oceans 5 dive) and 2 new dive instructors on Gili Trawangan (Trawangan dive). After a Padi instructor development course (IDC) there is a Padi instructor Examination (IE). This time the Padi instructor examination took place at Oceans 5 dive resort on Gili Air, Gili Islands, Lombok. The Padi IE started the 28th of August in the afternoon. The candidates were tested on their theorical dive and standars and procedure knowledge. The following day was a wet, open water, confined water presentations and rescue. The last morning was the classroom presentation. After the classroom presentations all 9 candidates could call themselves PADI instructor. All passed the PADI IE. Oceans 5 is very proud! Well done Signe, Agnes, Mariusz, Lara, Matt, Max and Cindy and ofcourse the candidates of Trawangan dive. See you all underwater!!!!! And lets the party begin!!!!
zaterdag 25 augustus 2012
Diving around the Gili islands is fantastic. There are always turtles around, the clownsfish always wants to play with you, and the water is cristal blue. Many people started diving there and become so addicted that they wanted to live the life style of a dive instructor. They like the athmosphere on the islands, being relax, no cars, no motorbikes and no dogs. And in the evening enough bars and restaurants to have a nice time. At this moment Oceans 5 dive resort has 7 people who are following their dream to become a Padi dive instructor and hopefully work on the Gili Islands. The instructor development course (IDC) at Oceans 5 dive resort is almost over. There are 3 days to go and after then there will be a Padi Instructor Examination (IE) over 3 days. For more information about the IDC: email@example.com