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Apteronotus albifrons


Apteronotus albifrons
Black Ghost Knife Fish
黑魔鬼刀
The black ghost knifefish, Apteronotus albifrons, is a tropical fish belonging to the ghost knifefish family (Apteronotidae). They originate in South America in the Amazon Basin in Peru and from Venezuela through Paraguay in the Paraná River. They are becoming popular in aquaria. The fish is all black except for two white rings on its tail, and a white blaze on its nose, which can occasionally extend into a stripe down its back. It moves mainly by undulating a long fin on its underside. It will grow to a maximum length of 20 inches (50 centimeters). It does not have scales.
They are nocturnal. They are a weakly electric fish which use an electric organ and receptors distributed over the length of their body in order to locate insect larvae.
The black ghost knifefish natively lives in fast moving, sandy bottom creeks in a tropical climate. South American natives believe that the ghosts of the departed take up residence in these fish, hence the name
Black ghost knifefish require a medium sized tank of 30-40 US gal (95-110 litres) when smaller, though as they grow larger will require a much larger tank of around 75+ US gal. A lid is needed as they have been known to jump out. Black Ghost knifefish get to a maximum size of 20" in the wild, but usually stop growing at 12" in home aquaria. They should be provided with a shelter (such as a plastic tube or driftwood) in which to hide. They prefer a dimly lit tank as their eyesight is optimized for low light. To help them see, they are a weakly electric fish. They will eat smaller fish in the tank and are intolerant of conspecifics. As with other scaleless fish, they are vulnerable to parasite infestations such as ich (Ichthyophthirius multifiliis). 

黑鬼鱼,也叫无背鳍鳗,学名:Apternotus albifrons,英文名:Black Ghost Fish,国内也有人俗称黑魔鬼。黑鬼鱼原产南美洲的亚马逊河流域,属大型鱼,成鱼体长45 - 50公分。外型是令人不愉快的黑色,尾柄突出如棒状,幼鱼有白色线条,身体呈刀型,侧扁,没有背鳍,臀鳍宽大而发达,成鱼尾鳍上的白色斑点会随成长而退化消失。同种中还有一款咖啡色的品种,鱼友们称为“咖啡魔鬼”。
黑魔鬼的身体呈刀型,侧扁,没有背鳍,臀鳍宽大而发达,尾鳍成棒状,幼鱼时期在尾鳍上有两块白色斑点,但会随着生长而退化消失。此鱼双目退化依靠尾部白色环节处发出的微弱电流来感知周围情况。同种的另一咖啡色的品种,称为“咖啡魔鬼”。
  它有着一个凶悍的名字,却习性温和,可以和绝大多数的热带鱼混合饲养。
  “魔鬼”,这个名字更多的只是表示了它的神秘特性--黑魔鬼喜欢夜行性生活,大多数时候,它们躲藏在密植的水草丛中,岩石、沉木的缝隙的幽暗环境里。所以,除了饲养者本人,其他人不太会留意到它们在水族箱中的存在,当偶尔它们在白天竖立游动着滑过水族箱一际的的时候,宛若一个突然出现的黑色幽灵。
  黑魔鬼的眼睛已经退化,却依然能够凭着灵敏的嗅觉,借助宽大的臀鳍和桨翼一般的尾鳍在水族箱中异常灵敏地穿梭。没有哪种鱼类的游姿可以与黑魔鬼相媲美,灵巧、美妙的游姿就象一支黑色的羽毛在风中舞动!这正是黑魔鬼吸引人的魅力所在。
  黑魔鬼对水质较为敏感,喜欢生活在弱酸性的清水中。它们体格极其强健,很少会感染得病。黑魔鬼喜欢摄食动物性的活饵,却也十分容易接受各种人工饵料。
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