Question

breathing organs of fish

Answer 1

according too the Science research gills is breathing organ as it intake water dissolved oxygen and throw co2 through water

Answer 2

so here is your answer.....
fish use specialized organ gills in order to breathe the oxygen dissolved in water. the mouth and throay of a fish force water over the gills . Gills have a lot of blood vessels . The water has a higher concentration of oxygen then the blood .
hope it will help you.