Question

why do fishes breathe vigorously

Answer 1

Explanation:

Nonetheless, fish need oxygen to breathe, too. In order to remove oxygen from the water, they rely on special organs called "gills." Gills are feathery organs full of blood vessels. A fish breathes by taking water into its mouth and forcing it out through the gill passages.

Answer 2

Answer:

The lungs of mammals would not work very well for a fish , one breathe underwater would fill them with fluid and make them useless . so, dish need oxygen to breathe