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Evaluation of Three Gears for Sampling Spawning Populations of Rainbow Trout in a Large Alaskan River
Author(s) -
Schwanke Craig J.,
Hubert Wayne A.
Publication year - 2004
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/m03-062.1
Subject(s) - electrofishing , netting , rainbow trout , fishery , hook , sampling (signal processing) , fishing , fish <actinopterygii> , biology , environmental science , structural engineering , filter (signal processing) , political science , computer science , law , computer vision , engineering
Alternatives to electrofishing are needed for sampling sexually mature rainbow trout Oncorhynchus mykiss during the spawning season in large Alaskan rivers. We compared hook and line, beach seining, and actively fished gill nets as sampling tools. Beach seining and active gill netting yielded similar catch rates, length frequencies, and sex ratios of sexually mature fish. Hook‐and‐line sampling was less effective, with a lower catch rate and selectivity for immature fish and sexually mature females. We conclude that both beach seining and active gill netting can serve as alternatives to electrofishing for sampling sexually mature rainbow trout stocks during the spawning season in large rivers with stable spring flows and spawning areas with few snags.