Hawksbill turtle

Two years after their detainment, 13 poachers, from Vietnam, who were caught with the dead bodies of 101 endangered Hawksbill turtles (known in scientific circles as Eretmochelys imbricata) near El Nido, northern Palawan, in the Philippines, have finally been convicted and sentenced to hefty fines along with some jail time.

On the 22nd of June, The Regional Trial Court of Puerto Princesa, Branch 50, after much deliberation, decided that the Vietnamese poachers should face jail time for their heinous acts, and will receive anywhere from 6 to 18 months, plus have some hefty fines to pay.

Since the poachers have been sitting in jail since the 2nd of September 2008, the court also decided that they will only have to cough up the money for the fines.

Two Filipino gunboats apprehended the Vietnamese boat transporting the poachers five miles east of Cabaluan Island near El Nido on August the 29th 2008. In a sheer act of desperation, the 13 crew members aboard the boat tried to sink her by flooding the holds, however were preented from doing so by law enforcement officers.

When the cargo holds were explored, they discovered the corpses of 101 Hawksbill Turtles, classified as being critically endangered, which is the highest risk rating for any living animal. This rating was handed down by the IUCN, the International Union for Conservation of Nature, some time ago.

So, they did the crime, they served the time, now all that remains is for them to pay the fine… Although, is it really enough? Did the poachers learn their lesson? Or were they simply sorry they were caught?

This Monday, a Megamouth shark (Megachasma pelagios) was caught by a Taitung fisherman off the coast of Taiwan.

According to National Taiwan Ocean University’s Department of Environmental Biology and
Fisheries Science, the shark, which was netted off the county’s Chenggong coast, is only the 42nd that has been caught or sighted worldwide and the ninth in Taiwan since the species was discovered in 1976.

Mega mouth shark exhibited at the Aburatsubo Marine

The shark was identified by marine biologist Tien from the Eastern Marine Biology Research
Center (a part of the Council of Agriculture’s Fisheries Research Institute). It was 3.9 meter long, weighed 350 kilograms, and its mouth measured 75 centimeters across when opened.

The shark has now been purchased for NT$18,000 (US$549) by Chen Wen-jung, owner of a local shark museum where the fish will be displayed as a preserved specimen. Wen-jung said he has collected dozens of shark specimens but that this was his first Megamouth.

In late March 2009, a 500-kilogram, 4-meter long Megamouth shark was caught off Burias Island in the Philippines and turned into kinunot.

Big-mouthed but elusive
The Megamouth shark remained unknown to science until November 15, 1976 when a 4.5 meter long specimen became entangled in the sea anchor of a United States Navy ship about 25 miles off the coast off Kaneohe in Hawaii. Since then, the Megamouth has continued to be a rare sight and this deep water shark has for instance only been recorded on film three times.

The Megamouth is named after its gigantic mouth which it uses to filter out plankton and jellyfish from the water. When feeding, Megamouth swims around with its mouth wide open in a fashion similar to the Basking shark. The mouth is surrounded by luminous photophores, which may act as a lure for plankton or small fish. Megamouth can also be recognized on its large head and rubbery lips.

“The ‘underwater turbulence’ the jellies create is being debated as a major player in ocean energy budgets,” says marine scientist John Dabiri of the California Institute of Technology.

Jellyfish are often seen to be aimless aquatic drifters, propelled by nothing but haphazard currents and waves, but the truth is that these gooey creatures continuously contract and relax their bells to move in desired directions.

The jellyfish Mastigias papua carries algae-like zooxanthellae within its tissues from which it derives energy and since the zooxanthellae depend on photosynthesis, the jellyfish has to stay in sunny locations. Research carried out in the so called Jellyfish Lake, located in the island nation of Palau 550 miles east of the Philippines, shows that this jellyfish doesn’t rely on currents to bring it to sunny spots – it willingly budges through the lake as the sun moves across the sky.

In Jellyfish Lake, enormous congregations of Mastigias papua can be found in the western half of the lake each morning, eagerly awaiting dawn. As the sun rises in the east, all jellyfish turn towards it and starts swimming towards east. The smarmy creatures will swim for several hours until they draw near the eastern end of the lake. They will however never reach the eastern shore, since the shadows cast by trees growing along the shoreline cause them to stop swimming. They shun the shadows and will therefore come to a halt in the now sundrenched eastern part of the lake. As the solar cycle reverses later in the afternoon, millions of jellyfish will leave the eastern part of the lake and commence their journey back to the western shore.

Together with his research partner, marine scientists Michael Dawson of the University of California at Merced, John Dabiri have investigated how this daily migration of millions of jellyfish affects the ecosystem of the lake.

What the jellies are doing, says Dabiri, is “biomixing”. As they swim, their body motion efficiently churns the waters and nutrients of the lake.

Dabiri and Dawson are exploring whether biomixing could be responsible for an important part of how ocean, sea and lake waters form so called eddies. Eddies are circular currents responsible for bringing nitrogen, carbon and other elements from one part of a water body to another. The two researchers have already shown how Jellyfish like Mastigias papua and the moon jelly Aurelia aurita use body motion to generate water flow that transports small copepods within jellyfish feeding range; now they want to see if jellyfish movements make any impact on a larger scale.

“Biomixing may be a form of ‘ecosystem engineering’ by jellyfish, and a major contributor to carbon sequestration, especially in semi-enclosed coastal waters,” says Dawson.