MassWildlife operates five fish hatcheries in the state, located in Sandwich, Belchertown, Montague, Sunderland, and Palmer. Rainbow, brown, brook, and tiger trout are raised for stocking rivers, streams, lakes, and ponds throughout the Commonwealth. Each fall, approximately 1.5 million trout eggs are collected by fisheries and hatchery staff. Trained staff extract eggs from females and milt from males and combine them with water to begin the fertilization process. After incubating for about two months, the eggs will hatch into fry. After growing in the hatchery for 1.5\u20132.5 years, these trout will be ready for stocking statewide.\u00a0\n\nLearn more about MassWildlife\u0027s Trout Stocking Program.