Question

Fishes having swim bladder, which do not have direct communication with the exterior and where resorbent and seretory part is not sharply separated from one another are called as
A. Physostomes
B. Physoclists
C. Euphysoclists
D. Paraphysoclists

Answer 1

Correct Answer - B
Two type of air bladders are known. In the more generalizes groups of teleosts, the air bladder retain connection with the gut via a pneumatic duct, just as ganoids and dipnoi. Such an open air bladder is called physostomous. In the teleost Erythrinus the air bladder has a lateral attachment to gut. Such a closed or ductless air bladder is called physoclistous.