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Epalzeorhynchos bicolor

Epalzeorhynchos bicolor
Red Tail Black Shark
The Red-tailed black shark (Epalzeorhynchos bicolor), also known as the Redtail Shark and Labeo bicolor, is a species of freshwater fish in the carp family, Cyprinidae. 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. The species is endemic to Thailand, and was described by Hugh M. Smith in 1931 as being 'not uncommon' in Bueng Boraphet and the streams which lead from it, and as being found in the Menam Chao Phaya as far south as Bangkok. A 1934 expedition reported catching a specimen in the Silom canal. 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. is notoriously difficult to sex Redtail Sharks. Females may have a grey belly, and males may have a more pointed dorsal fin, though there are some individuals with both these characteristics. In the aquarium tail bright red and orange being the most common. If the shark is stressed or unhealthy the red color will drain from its tail. Albino forms may also be encountered. Typically aggressive chasers, but will rarely bite or harm other fish. Individual personalities vary greatly - 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 semi-aggressive fish, but they do not like other sharks.
When two redtails are cohabitated together, 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, with five or more redtail sharks, surprisingly tend to get along much better than two or three of them, as they will establish a stable hierarchy; such a group will require a very large aquarium, however.
Redtail sharks are considered compatible in some community tanks, although they may chase docile/peaceful fish that present a large target (such as the Metynnis argenteus, or "Silver Dollar" fish). This may be harmless, but could cause a great deal of stress for the pursued fish, sometimes resulting in the death of the stressed fish. Redtails do not typically bite or injure other fish, but they will chase them and try to corner them. They will mostly chase fish away from their territory and then retreat, therefore it is important to ensure that your aquarium is large enough to allow the red-tail some space to call its territory. Aquariums should be at least 170 litres (45 gallons) or larger for a comfortable community. Redtails are bottom dwellers, so it is highly suggested that one does not introduce them into an aquarium with another bottom dweller, as they will constantly pester and harass them. They also should not be introduced to communities containing other shark-like fish.
Red-tails have varying personalities. Some are calm and will prefer to hide within its territory most of the time, while others are very aggressive and will constantly harass other fish. Most have at least a small streak of aggressiveness and will chase other fish once in a while. It is recommended to observe a prospective red-tail before buying it. Thus one can usually tell in a few minutes whether it is overly aggressive or more relaxed. However, this will not always be a good indicator of whether it will be compatible in your aquarium. It depends on what species are in a given aquarium's community.
Red-tail sharks have also been known to be excellent jumpers, having a tight fitting lid on the aquarium is recommended.

红尾黑鲨鱼爱在水的下层游动,但是常常可以看到它们在水中上下游动,追逐嬉戏。它对水质要求不严格,可以和 体形较大的热带鱼混养。