Posts by Harry

Fish of Koh Tao – Clownfish

By Harry, 17 February, 2012, No Comment

Clownfish or anemonefish (Nemo), often found at several of the dive sites around Koh Tao living in the shelter of an anemone. They form a symbiotic mutualisms relationship with sea anemones, which means they both provide benefits to each other, the clownfish feed on small invertebrates which could harm the anemone, whilst the fecal matter from the clownfish provides nutrients to the anemone.

As they dont stray too far from the anemone mating becomes a bit more difficult, the way they solve this problem is by changing sex, all clownfish are born male, and when they are ready to mate the largest and most dominant male turns into a female. When the female dies then the largest male will become female, and continue the cycle. There are also several other fishes that go through this change aswell. Finding Nemo will never be the same again..

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Congratulations Open Water Divers!!

By Harry, 3 February, 2012, No Comment

Congratulations to 5 new open water students; Birgitte, Ingrid, Jon, Dag, (all from Norway) and Zack (USA). Team Norway completed the whole course here at DJL, while zack only had to finish off the dives after completing the theory and confined in the states. With great conditions throughout the course, especially on the final dives at chumpon pinnacle and twins, with the sun shining, flat seas and visibility upto 30 metres.

After the course Jon and Dag continued on to complete their advanced open water course, which included navigation, peak performance bouyancy, deep, wreck and a night dive. Whilst Ingrid, Birgitte and Zack all went for some fun dives.

We hope you enjoy the rest of your travels and continue to dive – the DJL team

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Search and Recovery

By Harry, 3 January, 2012, No Comment

As part of the divemaster course, the DMT’s (Divemaster Trainees) complete several different scenarios, including assisting on courses from Open water, advanced, rescue, and others, they also practice navigating around dive sites and leading dives.

Another scenario is the search and recovery, this is where the DMT’s learn about tying knots from bowline to half hitches, they also gain more experience navigating with a compass, by using search patterns, and then finally when they find the missing item they use a liftbag to bring it to the surface. This scenario helps the DMT’s alot with becoming more comfortable navigating and also working as part of a team to find and recover different objects, and helps with communicating and solving problems underwater. For more info on the divemaster course have a look on our website.

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Turtle Island

By Harry, 13 November, 2011, 1 Comment

With great diving conditions and several sightings of Turtles recently Koh Tao is living upto its name as Turtle Island. In the past this local area has been a popular choice for Sea Turtles to feed in the bays and on the coral reefs, also to nest on the beautiful beaches.  Over time sadly the numbers had fallen, human fishing and habitat destruction began to affect the population of these fascinating Reptiles. It had seemed that many of which moved on to different areas.

Here on Koh Tao we get two types of turtle; the Hawksbill and the Green turtle.

Both similar in appearance the green turtles are usually bigger and have a ligther shade on their shell than the hawksbill, they can be found on several of the dive sites around Koh Tao.

Harry

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Watchmen

By Harry, 7 November, 2011, No Comment

While diving around the dives site in Koh Tao, whenever your swimming over sand its quite common to see small burrows in the sand, these are usually the home to Gobies. Gobies are part of the largest families of fish, with more than 2000 species.

Usually in these burrows they live with a shrimp, this is called a symbiotic relationship. This relationship works by the shrimp maintaining a burrow where the shrimp and goby both live. The shrimp has poor eyesight so the Goby looks out for any danger at the entrance of the burrow, thats why they are sometimes called watchmen or prawn gobies. The goby alerts the shrimp to any potential danger by swimming past it into the burrow.

Each party gains from this relationship; the shrimp gets a warning of approaching danger, and the goby gets a safe home and a place to lay its eggs.

So the next time your swimming over sand have a look for some of the smaller things to see.

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