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Age, Food, and Migration of Sea‐run Cutthroat Trout, Salmo clarki, at Eva Lake, Southeastern Alaska
Author(s) -
Armstrong Robert H.
Publication year - 1971
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(1971)100<302:afamos>2.0.co;2
Subject(s) - weir , fishery , salmo , trout , fish migration , fish <actinopterygii> , oncorhynchus , biology , geography , ecology , cartography
Information was collected on sea‐run cutthroat trout (Salmo clarki) from the Eva Lake system on Baranof Island, Southeastern Alaska. Migrations of 1,210 to 1,594 out‐migrants and 1,203 to 1,682 in‐migrants were recorded at a weir across the outlet of Eva Lake. Migration peaks occurred in mid‐May (out‐migrants) and mid‐September to early October (in‐migrants). No movement of cutthroat was noted at the weir from December through February. Ages of out‐migrant cutthroat ranged from 3 to 10, with the majority showing 5, 6, and 7 annuli on their otoliths. The numbers of annuli considered to be formed prior to smolt migration were 2 (3%), 3 (80%) and 4 (17%). Stomach contents consisted primarily of salmon young and insects during the summer and stickleback and insects during the winter in Eva Lake. The fish fed mostly on insects during their out‐migration and amphipods and salmon young in salt water. Results of the Eva Lake study and other studies on sea‐run cutthroat are compared.