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Population Dynamics and Exploitation of Rainbow Trout in Stokely Creek, Eastern Lake Superior
Author(s) -
Kwain WenHwa
Publication year - 1981
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1981)110<210:pdaeor>2.0.co;2
Subject(s) - rainbow trout , salmo , fishery , fish <actinopterygii> , population , trout , biology , mark and recapture , geography , demography , sociology
During the years 1970–1975 inclusive, 852 adult rainbow trout (Salmo gairdneri) from Stokely Creek were tagged; 248 tags were recovered by anglers. The recapture rate of tagged fish after 1 year at large averaged 3.8% and after 2 years 1.3%. The exploitation rate averaged 18.9% per year. A stable population was produced each year in Stokely Creek during the study period and averaged 868 adult rainbow trout. Estimated total mortality averaged 41% per year. Smolts resided in the creek 1, 2, or 3 years before they migrated down to Lake Superior. Smolts that migrated at age II or III appeared to have higher survival rates than age‐I smolts, judged by proportions of returning adults, whose history could be read from their scales. Fish that descended as yearling smolts grew much more rapidly during the first year in the lake than those that descended at 2 or 3 years of age.