Question
Give differences between cartilaginous and bony fishes.
✓
Answer
Differences between cartilaginous and bony fishes:
|
S.No.
|
Cartilaginous Fishes (Chondrichthyes)
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Bony Fishes (Osteichthyes)
|
|
1.
|
They are always marine.
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They may be marine or freshwater.
|
|
2.
|
Skin is covered by small placoid scales.
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Skin is covered with large cycloid scales.
|
|
3.
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Endoskeleton is cartilaginous.
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Endoskeleton is partly or completely bony.
|
|
4.
|
Gill slits are not covered by gill covers.
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Gill slits are covered by gill covers.
|
|
5.
|
Swim bladder is absent.
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Swim bladder is present.
|
|
6.
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Tail fin is asymmetrical .
|
Tail fin is symmetrical.
|
|
7.
|
Excretory matter is urea.
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Excretory matter is ammonia.
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|
8.
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They exhibit sexual dimorphism.
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Sexual dimorphism is usually present.
|
|
9.
|
Mostly viviparous
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Usually oviparous.
|
|
10.
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e.g., sharks, skates.
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e.g., Labeo, Catle, Hilsa.
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