Archive for ‘Ecological’

Jenkins Whip Ray

By , 22 July, 2015, No Comment

I have seen a few now over my time here on Koh Tao and every time they are always impressive. Last night however was the first time I have ever seen one at night and it was awesome. They seem far more relaxed at night. Where as during the day they seem to be either sleeping or scare easily at night it was far more focused on hunting and therefore we were able to spend far more time with it moving about the bottom. I am talking about the Jenkins whipray, a species of stingray. Not as common here as the Bluespotted Ribbon tail rail it grows to an impressive 1.5m across and has a broad, diamond shaped pectoral fin disc and a whip-like tail without fin folds. What is even more impressive about it is a row of large spear-like thorns along the midline. It is less colourful than the blue spotted being a more gray and brown colour on the top and white on its underbelly. I’ve always loved the way rays move gracefully through the water and the Jenkins is no exception. It made it one of my favourite night dives to date and an extremely good reason to go on more of them! Unfortunately the International Union for Conservation of Nature (IUCN) have assessed the species as vulnerable in Southeast Asia, due to intense fishing. To lose such as magnificent creature would be a tragedy and I hope something can be done about this as I hope more can experience diving with these animals.

by Alex

 

jenkins whip ray

Jenkins Whip Ray

 

 

 

 

 

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Why Go Pro?….

By , 27 May, 2015, No Comment

Why Go Pro?…

How many people can truly wake up every morning and say i love my job? i can guarantee that i think this every morning. in my opinion there isn’t much better out there than getting to take people of all different varieties diving, and helping them learn how to experience the underwater world.

There are many different reasons that led me to my career as a dive instructor with Davy Jones Locker Koh tao, but it was definitely one of the best decisions i have ever made. As a PADI professional i am lucky to be a part of the most widely recognized SCUBA training organisations on the planet. I have met many students who have come to Koh Tao for a dive course or even just some fun dives and who have got hooked instantly, and lets be honest its not a bad thing to get hooked on. As an instructor at Davy Jones’ Locker i get to work with a fantastic bunch of girls and guys from all different walks of life and we all have the wonderful opportunity of living on one of the most beautiful islands in the world (my humble opinion). Not only is the lifestyle amazing but i also get to show students and fellow divers some of the most diverse underwater life around.  so i urge you to consider taking the leap if you have a passion for the underwater world, the Divemaster and IDC programmes at Davy jones’ locker could just take you out of the real world and into our crazy underwater bubble, where your office and computer are replaced by sun sea and all the fun that goes with it.

By Dani

dani

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Coral Nursuries

By , 22 May, 2015, No Comment

Corals are tiny animals that live in colonies. Symbiotic algae (zooxanthellae) live inside the polyps. Just like plants on land, the algae need light to photosynthesize . The animal-part and plant-part of the corals live in symbiosis, which means they benefit from the presence of the other.

Often called “rainforests of the sea”, coral reefs form some of the most diverse ecosystems on Earth. They occupy less than 0.2% of the world’s ocean surface, about half the area of France, yet they provide a home for 25% of all marine species and feed over a billion people.

Coral nurseries are a relatively new phenomenon. Whereas one or two students tinkered with the idea in the 1980s, the first serious attempts came in the mid-1990s out of marine biologist Baruch “Buki” Rinkevich’s lab at the University of Haifa in Israel. It began when he went to check on some underwater fish cages in the Red Sea and noticed that a few Acropora corals had grown around them. Curious, he set up an experiment to track growth and see how many would die in a nursery over a year.

At first, most scientists were skeptical. Corals are notoriously difficult and slow-growing. Moreover, they have a symbiotic relationship with specific algae, the demise of either spelling death for the reef. But as many have since discovered branching corals actually thrive in nursery environments, and their arms easily break off to form dozens or hundreds of new colonies. The new colonies not only grow faster than wild ones do, but reproduce sooner as well.

With any luck this could be a way forward to help our reefs recover in the various areas they have been affected in.

photo saisha

Coral Nursuries

By Saisha

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SEA SNAKES

By , 4 May, 2015, No Comment

Although all snakes can swim, sea snakes live mostly in the water.  They do need to come up for air but can stay under water for up to an hour! Since they need air regularly they are usually found in shallow waters of the Indian Ocean, and warmer areas of the Pacific Ocean.  They eat fish, fish eggs and eels that they find under rocks and in reefs.

There are about 30-50 different types of sea snakes and they belong to the Cobra family.  The average Sea snake grows to about 2 meters long and has a smallish head for its body size.  Their tails are flattened to make fast swimming possible and flaps over their nostrils close when they are underwater.

Sea snakes are very poisonous. Fortunately, these snakes have short fangs and they are unable to bite through diver’s suits very easily.  They are not likely to bite unless threatened.

Eels are sometimes mistaken for Sea Snakes. Eels are part of the fish family and have gills for breathing.  Sea snakes do not have gills but lungs instead and need to go to the surface for air.

Sea Kraits are one of the few sea snakes that go to land to lay their eggs while most others, like the Olive sea snake will give birth in the water. snake                                         Sea snakes do not have gills but lungs instead and need to go to the surface for air.

By Sophie

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“Snorkel for Sharks”

By , 17 March, 2015, No Comment

Hola amigos de Davy Jones Locker el pasado 10/ march / 2015. Hicimos un proyecto de finananciacion para ayudar a los tiburones apoyando y promoviendo el movimiento AWARE e todos nuestros océanos. “Snorkel for Sharks”.

La tarde empezó muy bien, con mas de 20 voluntarios en los que se encontraban diferentes nacionalidades involucradas como (Alemanes, ingleses, españoles, franceses…) y algunos mas con lo que fue un todo un éxito. Continuamos con la orientación del propósito de nuestra misión el cual era identificar tiburones(machos y embras), estimar tamaño y explicar cual era su comportamiento, para luego andar los datos de esta a project AWARE y que lo usaran en sus data base y también dar a conocer mas información de los pocos tiburones que tenemos en la zona. Un saludo amigos tendremos mas noticias pronto.

Manu

 

shark2

 

 

 

 

 

 

 

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