Polypterus onatipinnis

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Polypterus onatipinnis is a weird fish. Its common name is Bichir. They originated from Central Africa and Zaire. Bichirs are fish but they do have some interesting features. This fish is truly unique.


Bichirs are an ancient fresh water fish. They have wide head and long bodies, which average around two feet long. The length includes their circular tail. These fish are scaly and have elongated fins protruding the front and back. Those fins somewhat resemble legs, and some people say that Bichirs look like salamanders. These fish have a unique swim bladder. Their swim bladder acts like a lung so the fish can breath for a short


time above the water. It takes in air and absorbs the oxygen. The swim bladder just isn’t


unique for acting like a lung, it is a paired swim bladder. These paired swim bladders are not the same size. The Bichirs still uses its gills for underwater breathing.


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These fish are usually found in the bottom plants of the sides of rivers. The are carnivorous and usually eat worms and small fishes. They will search in the river bottom to find the worms during the day. At night it when the Bichirs do most of their hunting. .


For reproduction of the Birches the male instigate the spawning process. The physical difference to distinguish the males from the females is males usually have larger fins by their anus and females usually have big heads. The reproduction process is pretty easy and is reality quick. The female lies her eggs near the back end of the male. The male then releases his sperm to fertilize the eggs. Then the young will start to hatch in four days if it is in a topical climate.


The Polypterus onatipinnis is indeed a weird fish. It’s is very significant to the vertebrate evolution. It is a very ancient fish but it gave much to the vertebrate features. One feature is the leg-like appendages in the front and back of the fish. Even though they are fins they look and act like legs. The fish uses them to move along the bottom of lakes and rivers. The feature that is most significant to the vertebrate evolution is its swim bladder. It is a paired swim bladder, which is unique for a fish. The bladder acts like a lung, which is even more unique. The lung-like feature was a major part of the vertebrate’s evolution.





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