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Fishes are vertebrate species.
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They all live in water.
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Fish area is more in tropical area.
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They are tiny to massive in size.
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They have been living in water for more than 500 million years, coelacanth which is known the ancient fish.
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 Fishes breathe through gills.
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Fins help them in their movement in the water.
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Fishes are the only vertebrates with true fins.
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Some are hermaphrodite (possessing both sex organs – California Sheephead)
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There are 62 orders.
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 There are more than 25,000 species.
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