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31. Compare and contrast cartilaginous and bony fishes. A: Comparison between cartilaginous and bony fishes: [AP M-16][AP May-17] [TS May-19,22]

Cartilaginous fishes	Bony fishes
2) Eartilaginous fishes are mostly marine.	1) Bony fishes are found in all aqautic habitats.
3) Mouth is ventral.	2) Endoskeleton is made up of bones.
4) Scales are placoid.	3) Mouth is terminal.
5) Air bladder is absent.	4) Scales are cycloid, ctenoid, ganoid or cosmoid.
6) Excretion is ureotelic.	5) Air bladder is present.
7) Caudal fin is heterocercal.	6) Excretion is ammonotelic.
8) Claspers are present in males.	7) Caudal fin is homocercal or diphycercal.
9) Mostly Viviparous.	8) Claspers are absent in males.
10.) Ex: Scolidon(dog fish), Torpedo	9) Mostly Oviparous.

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Updated on: Mar 8, 2023