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?