Question

Air bladder is connected to intestine in which one of the following group of fish (physostomous fish)?

• A. Anguilliformes
• B. Syngnathiformes
• C. Ophiocephaliformes
• D. Perciformes

Answer 1

Answer: (A)

Anguilliformes

The swim bladder or air bladder or fish maw is a gas-filled organ that contributes the ability of a fish to control its buoyancy and helps in swimming. In physostomous swim bladders, a connection is retained between the swim bladder and the gut, the pneumatic duct, allowing the fish to fill up the swim bladder by 'gulping' air. The physostome fish encompass the bichirs, a number of carps, trouts, herrings, catfish, eels and the lungfish. Of the given options, eels belong to the order Anguilliformes.