Cartoon Fish
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Discover Cartoon Fish coloring page best quality picture to print or download. It is a sac called the "fin sac" that allows the fish to balance in the water.
This is a thin membrane sac. This sac is connected to the esophagus by a tiny tube in many fish. There is always some air in the sac. The animal contracts or widens this sac with special muscles so that it can rise above the water or go deep. In low-density freshwater fish, this pouch is more developed than in marine fish. With the help of this pouch, the fish stays in balance in the water without exerting much force.
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