Effects of Hatchery Procedures on Later Return of Atlantic Salmon to Rivers in Maine

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Abstract
The hatchery procedures used at Craig Brook (Maine) National Fish Hatchery in rearing and stocking Atlantic salmon (Salmo salar) into rivers in Maine were tabulated according to 85 variables related to strain, hatching, fry size, growth, water temperature, water volumes, type of feed, disease treatment, living space, stocking date, river conditions, and treatment during transit. Variables in the rearing regime were compared with returns of adult salmon by standard multiple regression statistics to identify possible reasons for variability in the survival rate of hatchery lots planted in different years and rivers. Only 5 of 493 multiple regressions were significant (P = 0.025), and these were associated with water flow and amount of living space during the last few months of life in the hatchery, or with relative water level in the rivers receiving smolts.

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