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Why always fish opens and closes its mouth?

Asked: Kyle Cumberland ????⚓️??--?‍♂️, Last Updated:

Reason: The amount of dissolved oxygen in water is very low. The fish opens and closes its mouth (to push water over the gills) more number times so that more and more water passes over the gills. So that sufficient oxygen can be absorbed by the blood in the gills to meet the body's requirement.

FAQ

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