Question

Fishes with swim bladder without direct communication with exterior and where there is little separation of secretory and absorbent parts are

• A. Physostomes
• B. Physoclists
• C. Euphysoclists
• D. Paraphysoclists

Answer 1

The correct option is D Paraphysoclists

A. Physostomes are the fishes which contain a pneumatic duct that connects the gas bladder to alimentary canal.

B. Physoclists are the fishes that lacks the duct connecting air bladder and alimentary canal.

C. Euphysoclists are the fishes in which a posterior chamber is formed in the absorbent part which separates it from the secretory path.

D. Paraphysiclists are the fishes in which the absorbent path is bent and hence, there is little separation between the secretory and absorbent parts. The swim bladder has no direct communication with the exterior.

So, the correct answer is 'Paraphysoclists'.