Eeltail catfish 鳗鲶科
(重定向自Plotosidae)
The eeltail catfish are a family (Plotosidae) of catfish whose tails are elongated in an eel-like fashion. These catfishes are native to the Indian Ocean and western Pacific from Japan to Australia and Fiji. The family includes about 35 species in 10 genera. Wikipedia lists 41 species. About half of the species are freshwater, occurring in Australia and New Guinea.