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Some Effects of Stocking Coho Salmon Fry and Supplemental Instream Feeding on Wild and Hatchery‐Origin Salmon
Author(s) -
Irvine J. R.,
Bailey R. E.
Publication year - 1992
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(1992)012<0125:seoscs>2.3.co;2
Subject(s) - hatchery , stocking , fishery , oncorhynchus , sympatric speciation , biology , zoology , fish hatchery , fish <actinopterygii> , aquaculture , fish farming , ecology
Regular addition of hatchery food to a small coastal stream during summer and early fall appeared to benefit fry of hatchery‐origin coho salmon Oncorhynchus kisutch more than sympatric, naturally occurring wild fry. At a supplemental‐feeding site, hatchery fry were larger and in better condition than wild fry, and the size discrepancy between the two groups was greater than at an adjacent site where supplemental feeding did not occur. At this unsupplemented site, hatchery fry were consistently greater in length and weight than wild fry, but wild fry were generally in better condition. The long‐term benefits realized by stocking and supplemental feeding of coho salmon fry remain uncertain.