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Effects on Survival and Homing of Trucking Hatchery Yearling Coho Salmon to Release Sites
Author(s) -
Johnson Steven L.,
Solazzi Mario F.,
Nickelson Thomas E.
Publication year - 1990
Publication title -
north american journal of fisheries management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 72
eISSN - 1548-8675
pISSN - 0275-5947
DOI - 10.1577/1548-8675(1990)010<0427:eosaho>2.3.co;2
Subject(s) - hatchery , homing (biology) , tributary , oncorhynchus , fish hatchery , fishery , fish <actinopterygii> , chinook wind , biology , fish farming , ecology , aquaculture , geography , cartography
Effects of transporting yearling coho salmon Oncorhynchus kisutch to release sites in Oregon coastal river systems were determined by comparing survival of fish transported before release to that of fish released without being transported. Ocean catches of fish transported before release ranged from 43 to 113% of those for control fish within years. Over 4 years, ocean catches of fish trucked and returned to the hatchery for release, trucked and released upstream from the hatchery, and trucked and released in a tributary downstream from the hatchery averaged 76, 83, and 84% of ocean catches of untrucked fish. For yearling coho salmon trucked to another Oregon coastal river system for release, fish acclimated at the release site for 6 weeks before release showed consistently higher survival than groups released immediately upon arrival at the release site. Almost all returning adult fish released as yearlings at a site 23 km upstream from the rearing hatchery returned to the rearing site, whereas only 7–26% of adults originally released in a tributary 11 km downstream from the rearing hatchery returned to the rearing site. Less than 0.001% of fish transported from the rearing hatchery and released in another river basin on the Oregon coast returned to the rearing hatchery as adults.