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Cyprichromis leptosoma


Cyprichromis leptosoma
Black Fin Slender Cichlid
蓝剑鲨慈鲷
Cyprichromis leptosoma is a mouthbrooding species of fish in the Cichlidae family. It is endemic to Zambia. Its natural habitat is Lake Tanganyika.
It is a streamlined fish with a body color that is silvery to blue. It grows to about 3 inches or 8 centimeters in length. The males have either yellow or blue tails. Other fish that are similar but larger are sometimes referred to as Cyprichromis leptosoma, but they are generally considered to be a separate undescribed species.
C. leptosoma, like other fish in its genus, has an unusual breeding strategy. Males form a three-dimensional lek in mid-water. Females decide which males they want to mate with. If a female chooses to mate with a particular male, they will release an egg, which the male fertilizes in mid-water. The female catches the egg in her mouth without the egg hitting the ground. The female protects and broods the eggs in its mouth until the fry hatch and are able to swim on their own. This takes about three weeks. At that point the female releases the eggs into a rocky area for the fry's protection, and leaves them there on their own.
C. leptosoma is subject to several predators within Lake Tanganyika. The most prominent is Cyphotilapia frontosa, which lives in deep water most of the time, but comes up to feed on C. leptosoma primarily at dawn.

Due to its vivid color, small size and relative hardiness, C. leptosoma is a reasonably popular fish for home aquariums. There are several color varieties, the most popular of which is called "blue flash". Cyps, as they are sometimes referred to in the aquarium hobby, are more sensitive to water conditions than some more popular Lake Tanganyikan aquarium cichlids, such as many Lamprologus, Neolamprologus, Julidochromis and Altolamprologus species. But they are more tolerant than many other Lake Tanganyikan mouthbrooders, such as Tropheus, Petrochromis and Eretmodus. They are also less particular about their diet than many other mouthbrooders.
They do require space in an aquarium. It is generally suggested that at least a 55 gallon tank be used to house a group of 6 cyps. Within a group, breeding will likely occur naturally if males and females are both present. The female's mouth becomes very distended after holding the eggs/fry for a couple of weeks. If the female does not release the fry after about three weeks it may be necessary to remove the eggs from her mouth manually (a process called "stripping" the fry)..

蓝剑沙群是坦湖中最不像慈鲷的种类,其行为也大异其趣,他可说是最喜欢集体行动的坦鱼了,不但同种聚集还会和其它同属甚至是相近的cyprichromis属的鱼相混而形成一大集团,因此在人工饲养中是最适合群养、混养的坦鱼,他们的群体可能有三种形式:觅食群-主要由成熟母鱼及尚无领域性的公鱼(同种或不同种);繁殖群-靠近岩石表面,由占有领域的公鱼和准备产卵的母鱼组成(同种);孵育群-由口孵的母鱼组成(同种较常见)。
  由于他们常以直线方式运动,因此大一些的缸子是较好的选择,最好能超过100公分,深度则较无限制,但缸子上需要加盖以免受惊扰或被追赶的蓝剑沙跳出。若进入繁殖状态则可置于较小的缸子,可避免发情的公鱼驱赶其它未成熟个体并方便管理,但成鱼通常不会吃幼鱼,因此可以任母鱼自行口孵而不用隔离,也不用采人工孵化以免因采子时机不对而造成损失,养一大群是最好的饲养方式,但雄鱼的体色可能需要较低的水温才能显现,所以尽可能保持在22~24℃

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