zondag 30 december 2012

Reef Clean Up Gili Air with Oceans 5 dive

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: info@oceans5dive.com

zaterdag 22 december 2012

Turtle release at Gili Air

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

Facts about thge Giant Trevally

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

Facts about Porcelain Crabs

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

What is the primary benefit of enriched air (Nitrox)?

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

Facts about Trumpetfish

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

Safety Stops

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?

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

Facts about Parrotfish

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.