EVERYDAY SCIENCE

Detailed explanation-1: -The difference is, we get our oxygen through air while fish get it through water. With humans, the lungs extract oxygen from the air we breathe and transfer it into the bloodstream, at the same time releasing carbon dioxide from the system. With most-but not all-fish, the gills do the same thing.

Detailed explanation-2: -Even though fish can live their lives underwater, they still need oxygen to “breathe”. Instead of breathing air, fish must get their oxygen from the water. This process requires large volumes of water to pass through absorption surfaces to get enough oxygen into their bodies using their mouths and gills.

Detailed explanation-3: -A fish breathes by taking water into its mouth and forcing it out through the gill passages. As water passes over the thin walls of the gills, dissolved oxygen moves into the blood and travels to the fish’s cells.

Detailed explanation-4: -Aquatic respiration is the term used when fishes breathe. It is the process of gaseous exchange with water by an aquatic organism, receiving O2 from oxygen dissolved in liquid and removing carbon dioxide and other metabolic products into the water. Fish need their gills to breathe and require a steady supply of oxygen.