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Heterotis niloticus


Heterotis niloticus
African Arowana
非洲龙
The African arowana, Heterotis niloticus, is a member of the arowana family. Despite being called an "Arowana", the African arowana is more closely related to Arapaima gigas, the only other member in the subfamily Heterotidinae. The only plankton-feeding osteoglossid, the African arowana has a more terminal mouth than other species of arowana.
Like the other Osteoglossids, the African arowana is a long-bodied fish with large scales, long dorsal and anal fins set far back on the body, and a rounded caudal fin. Its height is 3.5 to 5 times Standard Length (SL). It has been reported to reach up to 100 cm SL and weigh up to 10.2 kg.
This fish is gray, brown, or bronze in color. Coloration is uniform in adults, but juveniles often have dark longitudinal bands.
African arowanas have air-breathing organs on its branchiae, enabling them to survive in oxygen-depleted water. A suprabranchial organ allows it to concentrate small planktonic food particles and also has a sensory function.
This species is widespread throughout Africa, where it is native to all the watersheds in Sahelo-Sudanese region, Senegal, and Gambia as well as parts of eastern Africa. This range includes the basins of the Corubal, Volta, Ouémé, Niger, Bénoué, and Nile Rivers as well as those of Lake Chad and Lake Turkana. It has been successfully introduced to Côte d'Ivoire, the Cross River in Nigeria, the Sanaga and Nyong rivers in Cameroon, and Ogooué River in Gabon, as well as the lower and middle Congo River basin, including Ubangui and Kasaï Rivers.
分布于尼罗河中上游和热带西非洲。外形类似于亚洲及澳洲龙鱼。其吻端到背鳞前位置的轮廓不是直线型的,此外口部较大而不开裂,觅食时才会张开。体色为橄榄色带灰色而不是黑色,天然水域中的尼罗河龙鱼可长达一米。在水族箱中可长至100厘米。须注意的是此鱼不吃小鱼而是吃浮游生物,象沦虫、红虫等等,这样巨大的鱼吃这么小的东西有趣吧?它的第四、五腮面的上部是螺旋状的类似于迷宫科鱼类的呼吸器官。
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