Migration of smallmouth bass Micropterus dolomieui between summer and winter habitats was investigated from 1985 to 1987 in the Embarrass and Wolf rivers of Wisconsin. Smallmouth bass of age 2 and older (> 200 mm, total length) migrated from the Embarrass River downstream 69–87 km to the Wolf River when the water temperature fell below 16°C in autumn. Smallmouth bass returned to the Embarrass River in April and May, and most individuals returned to the same 5-km reach of river. Adults (age 4 and older, > 280 mm) migrated sooner than subadult fish.
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Langhurst et al. (1990) studied this question.