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Breathing system of fish is very efficient as compared to land animals. You have dead space in case of land animals. No such dead space is present in case of fish. Oxygen is only sparingly soluble in water. (4 to 5 ml per liter.) You have continuous flow of water from mouth, which passes through the gills of fish. The very less quantity of oxygen, that is present in water is trapped due to large surface area of gills. It is a great wonder that fish survive with such a less quantity of oxygen in water. The aquatic plants supply the oxygen in almost molecular form that is required by fish to breath in.

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9y ago
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12y ago

Fish use gills.

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Q: What do fish use for breathing?
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