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Observed Mortality of Rainbow Trout Caught by Different Angling Techniques in Lake Taupo, New Zealand
Author(s) -
Dedual Michel
Publication year - 1996
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(1996)016<0357:omortc>2.3.co;2
Subject(s) - rainbow trout , fishery , fishing , fish <actinopterygii> , mortality rate , biology , demography , sociology
Angling mortality was assessed for Lake Taupo wild rainbow trout Oncorhynchus mykiss caught by four different trolling techniques and released. Observed cumulative mortalities 48–53 h after hooking were 15.3% for downrigger, 14.0% for wire line, 7.8% for lead line, and 2.2% for harling. Both immediate and delayed mortalities for each method are discussed. Ninety‐three percent of the total mortality occurred within 26 h after release. Hooking injuries, playing time, transit time, depth at capture, and fish length were not significant causes of mortality. Potential sources of bias in mortality rate estimates are discussed.