Red-Tailed Black Shark. Epalzeorhynchos bicolor
It is currently critically endangered in the wild, but common in aquaria, where it is prized for its deep black body and vivid red or orange tail.
As of 2011 it is only known at a single location in the Chao Phraya basin, and has Critically Endangered status on the IUCN Red List.3 From 1996 until 2011 it was believed to be Extinct in the Wild. There is no evidence that collection for the aquarium trade is responsible for the species’ decline, and it is more likely that construction of dams and draining of swamps that took place during the 1970s resulted in their decline.3
Typically they are aggressive chasers, but will rarely bite or harm other fish. Individual personalities vary greatly â€" some are calm, while others are extremely aggressive and cranky. They are bottom dwellers and like lots of dark hiding places. They get along with other semiaggressive fish, but they do not like other sharks.
When two red tails cohabitate, they have been known to become extremely territorial with one another. One shark will become dominant and will continually chase and harass the submissive shark, preventing it from feeding and resting. This will often result in the death of the submissive redtail shark. Larger groups of five or more, surprisingly, tend to get along much better than two or three, as they will establish a stable hierarchy; such a group will require a very large aquarium, however.
I prefer to think of Hipuks as an asexual mouse.- LatinD
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