Question

Which one of these is completely cartilaginous fish?

• A. Cat fish
• B. Flying fish
• C. Dog fish
• D. Gold fish

Answer 1

The correct option is C Dog fish

Catfishes are a diverse group of ray-finned fish and belong to superclass Osteichthyes.

The flying fish (Exocoetidae) is a family of marine fish in the order Beloniformes of the class Actinopterygii.

The goldfish is a freshwater fish in the family Cyprinidae of order Cypriniformes.

Dog fish belongs to class Chondrichthyes. This group contains all cartilaginous fishes. These fishes have snout like mouth and two dorsal fins, but no anal fin. There are spines in the dorsal fins which contains venom.

Thus, the correct answer is option C.