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Downstream Migration, Population Size, and Feeding of Juvenile Rainbow Trout,
By Wen-hwa Kwain
Journal of Great Lakes Research, Volume 9, Issue 1, 1983, Pages 52-59, ISSN 0380-1330, DOI: 10.1016/S0380-1330(83)71871-X.
Emigration of juvenile rainbow trout (Salmo gairdneri) from a tributary of Lake Superior was associated with receding water levels and rising water temperatures (peaking in mid-June). According to 1973 and 1979 estimates, about 23,000 juvenile rainbow trout inhabited the creek each year. Eleven major taxa of benthic organisms were collected in 1972, of which 88% were Diptera and Trichoptera. From a total of 136 stomaches examined, general agreement was found between benthos in the creek and food taxa utilized by the fish. However, the smaller fish (< 7 cm)fed more on benthic organisms than terrestrial insects, while the larger fish (> 14 cm) consumed more terrestrial insects than benthos.
Keywords: Benthos; Salmo gairdneri; Lake Superior