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shark catfish
The shark catfishes form the family Pangasiidae. They are found in fresh and brackish waters across southern Asia, from Pakistan to Borneo.〔 Among the 30-odd members of this family is the plant-eating, endangered Mekong giant catfish ''Pangasianodon gigas'', one of the largest known freshwater fish. Several species are the basis of productive aquaculture industries in Vietnam's Mekong Delta.
==Taxonomy and fossil record==
Although Pangasiidae forms a monophyletic group, several studies indicate this group may actually be a subtaxon nested within the family Schilbeidae. Thus, Pangasiidae's familial status may not deserve continued recognition.〔
Two fossil pangasiid species are described, ''Cetopangasius chaetobranchus'' and ''Pangasius indicus'', from the Miocene, and Eocene, respectively. However, the reported age of ''P. indicus'' from the Eocene is debatable, as the Sipang Fauna stratum where it is found has never been officially dated. Therefore, the earliest reliable pangasiid fossil age is of ''C. chaetobranchus'' from the Miocene.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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