Ca ho (Catlocarpio siamensis), vo co (Pangaius sannitwongsei) and tra dau (Pangasianodon gigas) living in the Mekong Delta are all large-size fish which can reach 300 kilos in weight and three meters in length. They are all in danger of extinction.As they have enormous size and always causes big waves when whisking their tail, the fish are called ‘sea monster of Mekong Delta’.
Scientists said the fish were found in large quantities in the Mekong Delta half a century ago, but they have become scarce and their names have been listed in the Red Book as endangered species.
The gradual disappearance of the precious fish has prompted many scientists to conduct research and save them with artificial breeding.
Vo co, or Pangaius sannitwongsei, is a species of giant freshwater fish in the shark catfish family (Pangasiidae). Though it is aggressive, its population has declined drastically mainly due to overfishing. It is now considered critically endangered.