Give an account of different types of fish ponds used for rearing fishes.

Explanation

Types of ponds for fish culture
Fish farm requires different types of pond for the various developmental stages of fish growth.They are:
a) Breeding pond: Healthy and sexually mature male and female fishes are collected and introduced in this pond for breeding.The eggs released by the female are fertilized by the sperm and fertilized eggs float in water as frothy mass.
b) Hatching pits: The fertilized eggs are transferred to hatching pits for hatching.Two types of hatching pits are hatcheries and hatching hapas.
c) Nursery ponds: The hatching are transferred from hatching pits after 2 to 7 days. The hatchlings grow into fry and are cultured in these ponds for about 60 days with proper feeding till they reach2-2.5 cm in length.
d) Rearing ponds: Rearing ponds are used to culture the fry. The fish fry are transferred from nursery pond to rearing ponds and are maintained for about three months till they reach 10 to 15 cm in length.In these rearing ponds the fry develops into fingerlings.
e)Stocking pond: The stocking pond is also called as culture pond or production pond.These ponds are used to rear fingerlings upto the marketable size.Before releasing the fingerlings, the pond is manured with orgainc manure and inorganic fertilizers.