Gills work in a way similar to lungs and extract oxygen from water to allow the fishes to breath. The fish pulls in water through the mouth and pushes it out through the gills, which absorb oxygen from the water and exchange it for carbon dioxide, which is expelled from the body. Gills allow the fishes to breath underwater. 

Fishes use the oxygen from the water in order to survive.

Fishes migrate for two main reasons – feed and reproduce. In some cases, scientists are still unsure why fishes migrate.

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