Which of the following is used mainly for balancing in fish?

Explanation

The fins are composed of bony spines protruding from the body with skin covering them and joining them together. Fins are used for movement, stability, nest-building, spawning, and as organs of touch. They can be single or paired. The caudal or tail fin is used for propulsion. Fish that have forked caudal fins usually are fast swimmers. The anal fin stabilizes the fish and provides propulasion while it is swimming. Ventral fins are also used to provide stability in swimming. The paired pectoral fins are used for manoeuvering the fish. The single dorsal fin helps balance the fish while swimming and also during sudden movements or turns. The rays of this fin are often sharp, and a spine is often present.