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FishBase Wikipedia

fishbase wikipedia
About AnimalsFirst occurrence of Norileca triangulata Crustacea Isopoda Cymothoidae from Indian marine fishesA few other fish have buildings equivalent to labyrinth organs in form and performance, most above all snakeheads, pikeheads, and the Clariidae catfish family. Fish have a closed loop circulatory system. The heart pumps the blood in one loop across the body. In most fish, the heart consists of four parts, including two chambers and an entrance and exit. The first part is the sinus venosus, a thin walled sac that collects blood from the fish’s veins before permitting it to flow to the second part, the atrium, that’s a huge muscular chamber. The atrium serves as a one way antechamber, sends blood to the third part, ventricle.