Question
Give differences between cartilaginous and bony fishes.

Answer

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

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