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Mortality of Chinook and Coho Salmon in Their First Year of Ocean Life following Catch and Release by Anglers
Author(s) -
Gjernes T.,
Kronlund A. R.,
Mulligan T. J.
Publication year - 1993
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(1993)013<0524:mocacs>2.3.co;2
Subject(s) - chinook wind , fishery , oncorhynchus , geography , biology , fish <actinopterygii>
Abstract The mortality of chinook salmon Oncorhynchus tshawytscha and coho salmon O. kisutch in their first year of ocean life following catch and release by anglers was examined. Five factors were recorded for each landed fish: species, hook type, barb type, injury location, and mortality. For the first time, a recursive causal model was used to analyze hooking mortality data. The data suggest that hooking mortality is better described by a two‐stage process than by traditional logistic models. Injury location is affected by hook type and barb type in the first stage, and mortality is affected by injury location and species in the second stage, Overall estimated mortality following release from sportfishing gear was approximately 30% for chinook salmon and 14% for coho salmon.