How is fish adapted for aquatic life?

Adaptations of fish that help it to live in water:
(a) The body of a fish is spindle-shaped and streamlined which allows least resistance while moving in water.
(b) The body of fish is provided with waterproof covering of scales.
(c) The body of fish is slimy because of the presence of mucous coating that reduces water tension.
(d) Fins are present in fish for movement such as swimming and changing direction.