Hatchery
A place where fish are bred and their eggs hatched and young raised, to stock farms or rivers.
Also: fish seed, nursery pond
A hatchery breeds fish, either by inducing spawning or by stripping eggs and milt, then hatches the eggs in jars, tanks or circular pools with flowing water and rears the young. In India most carp seed now comes from hatcheries, many of them in West Bengal, Odisha and Andhra Pradesh. Hatcheries also raise salmon smolts in North America and Europe, and mahseer and other threatened fish for restocking rivers. Critics note that hatchery fish can differ genetically from wild fish and that releases cannot replace lost habitat.