What are a rearing pond and a nursery pond?

Rearing pond is an area within a big fish farm where fry fish from the breeding ponds are transplanted to grow into fingerlings. It contains fertile soil and should have a minimum depth of 60-80 cm with 1.5 m of depth near the floodgate. The water in this pond should be changed every 10 days. Ponds where spawns are raised up to fry fish stage are known as nursery ponds.