Basic differences between fishes Belongs to Class Chondrichthyes and Osteichthyes are:
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Chondrichthyes (chondr – Cartilage, ichthys – fish)
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Osteichthyes (osteon – bone , ichthus – fish)
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Fishes with cartilaginous endoskeleton come under class chondrichthyes.
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Fishes with bony endoskeleton come under class osteichthyes.
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Such fishes body is covered with placoid scales
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Osteichthyes fishes is covered with cycloid and ctenoid scales
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Gills are five - seven pairs with no operculum
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Gills four pairs with operculum
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Tail heterocercal (hetero – other, kerkos – tail) means, tail lobes are unequal in shape.
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Tail homocercal (homo– same, kerkos– tail), means tail lobes are equal in shape.
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Air bladder or lungs absent.
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Air bladder is present and in some fishes lungs are also seen.
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For examples: Shark, Rays etc.
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For examples: Carps, tuna, salmon etc.
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