Gills And Gill Rakers Are Part Of The Fish'S Gill Arches And Are Used To Extract Dissolved Oxygen From The Water
Fish use their gills to extract dissolved oxygen from the water. Gill filaments are the red, fleshy part of the gills. They take oxygen into the blood. However, not all fish rely on their gill to breath. Some species carry a large part of their necessary oxygen through the skin. The gills regulate the levels of mineral ions and pH of blood vessels. They are complex structures that have a large surface area. Gill rakers are bony projections that help the fish feed. Some fish have more than 150 just on the lower arch. . . .
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