Giant Siamese Carp Catlocarpio siamensis

The Giant Siamese Carp, sometimes called Giant Barb, is the largest carp in the world and one of the largest freshwater fish. It is native to the Mae Klong, Mekong and Chao Phraya River basins in Indochina but may now be extinct in the last-mentioned. It is a slow-moving, migratory, vegetarian fish that can reach nearly 3 metres long and can weigh nearly 300kg.

Its mouth has no barbels. It has 4 sets of chromosomes rather than the usual 2 sets. Depicted on ancient stone temple carvings of Angkor Wat in Cambodia, the Giant Carp is now critically endangered by overfishing and habitat loss (from pollution and dam construction).