Cartilaginous fishes (Chondricthyes) | Bony fishes (Osteichthyes) |
1. Exclusively marine. | Marine & fresh water. |
2. Heterocercal caudal fin. | Homocercal caudal fin. |
3. Cartilaginous endoskeleton. | Bony endoskeleton |
4. Gill slits without operculum. | 4 pairs of gills covered by an operculum on each side. |
5. Crescent (half moon) shaped ventral mouth | Terminal mouth |
6. Skin with placoid scales. Teeth are modified placoid scales which are backwardly directed. | Scales are Cycloid, ctenoid etc. |
7. No air bladder so they have to swim constantly to avoid sinking. | Air bladder for buoyancy |
8. Sexes are separate. In males pelvic fins bear claspers. | Sexes are separate. No claspers |
9. Internal fertilization. | Fertilisation external |
10. Many of them viviparous | Mostly oviparous |
11. E.g. Scoliodon (Dog fish), Pristis(Saw fish), Carcharodon (Great white shark), Trygon (Sting ray),Torpedo (Electric ray) | E.g. Marine fishes: Exocoetus (flying fish),Hippocampus (sea horse), Sardine, Mackeral, Tuna, Remora (sucker fish), Pomfret, Cybium Fresh water fishes: Labeo (Rohu), Catla(Katla), Clarias (Magur), Tilapia, Anabas(Climbing perch) Aquarium fishes: Betta (Fighting fish), Pterophyllum (Angel fish) etc. |
Comparison between cartilaginous and bony fishes
Animals, Comparison, Fishes, Vertebrates, Zoology
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