Question

how fishes change their speed of movement​

Answer 1

Answer:

Fishes swim by moving their bodies and the tail area, with the work of the tail fin being especially important. Fins allow the fish to move, to keep balance and to turn. Fish keep their balance with pelvic and pectoral fins. The scale-covered, streamlined body is slimy, which helps them swim faster.

Answer 2

Answer:

by their tail they change their direction and movement