In the Gulf of Thailand, fisheries researchers are releasing baskets full of young bamboo sharks. The small, slow moving, bottom dwelling sharks with striped bodies and an extra long tail have become endangered in recent years because of their popularity with fish collectors and exotic food diners.
Researchers have released scores of juvenile bamboo sharks over the past several months, hoping to remove the species from the International Union for Conservation of Nature’s “Near Threatened” red list.
“We dive down to the sea base to release the fishes in safe area so they have a better chance to survive, rather than releasing them on the water surface like most other animals,” said fisheries official Udom Krueniam earlier this month. “If we release them on the water surface, there’s more chance they’ll be eaten by bigger fish or swim out from shelter.”
Researchers last week released 40 of the brownbanded bamboo sharks, aged between 2 and 3 months, in an purpose-built artificial coral reef at a depth of 18 metres (60 feet).
The species is native to the Gulf of Thailand, and is also found across Southeast Asia, Japan, and Northern Australia.
A conservationist from the marine fisheries research centre in Thailand’s east coast holds brownbanded bamboo sharks before they are released into the sea, in an effort to increase the population of the sharks, which numbers have been decreasing in recent years as they are often netted as bycatch or end up in the tanks of exotic fish collectors.
The sharks are one of the smallest marine predators, growing to a maximum length of around 1.2 metres (4 feet), and are not threatening to humans. They feed mainly at night, using their small teeth to grasp or crush prey.
Researchers hope the released sharks will settle in to their new home, where they will initially be sheltered by the man-made reef and hopefully reproduce.
Scissors are used to cut off the end of an egg sheath to help release the baby shark inside. Researchers help hatch the eggs in an aquarium, rather than in the open sea where they are vulnerable to other predators.
Udom said a successful egg hatching project last year was providing researchers with more baby sharks to release this year.
The project has so far helped hatch, nurse and deliver more than 200 bamboo sharks to the Gulf of Thailand.