Question

how does exchange of gases occur in a fish

Answer 1

Answer:

through gills the exchange of gases takes place in fish

Answer 2

║Answer║

The exchange of gases in fishes takes place through gills. Gills have large number of filaments supplied with thin blood capillaries. Water enters through the mouth and passes over the gills. Oxygen is absorbed by blood in the capillaries and carbon dioxide is given out through its walls.