A fish hatchery is a facility where fish eggs are hatched and fish are reared through early life stages. Hatcheries provide fish seed for aquaculture and some fisheries by spawning, hatching, and caring for various fish and shellfish species. Factors to be considered in hatchery design include site selection, water supply and disposal systems, equipment selection, and developing floor plans. Tanks can be circular or rectangular and are used for rearing fish at different life stages.