Question

In fast swimming fishes, propulsion is mainly due to

• A. Pelvic fins
• B. Caudal fin
• C. Dorsal fin
• D. Pectoral fins

Answer 1

Answer: (B)

Caudal fin

A. Pelvic fins: These fins are also called ventral fins and are paired. These are generally located behind the pectoral fins.

B. Caudal fins: These fins are the tail fins and maybe homocercal or heterocercal.

C. Dorsal fins: These are single and located at the back of the body of fish.

D. Pectoral fins: These are two in number and hence, are paired. These fins are called fish's arm and are located on each side of the body of fish.

In fast swimming fishes, propulsion i.e. the action of pushing forward, is due to the caudal fin. So, the correct answer is 'Caudal fin'.