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Reducing Length Variation in Juvenile Steelhead and Coho Salmon through the Use of the AutoFish Tagging Trailer System
Author(s) -
Tipping Jack M.,
Seidel Paul R.
Publication year - 2006
Publication title -
north american journal of aquaculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.432
H-Index - 41
eISSN - 1548-8454
pISSN - 1522-2055
DOI - 10.1577/a05-050.1
Subject(s) - fishery , hatchery , biology , oncorhynchus , juvenile , fish <actinopterygii> , fish hatchery , trailer , rainbow trout , coefficient of variation , significant difference , zoology , aquaculture , fish farming , ecology , statistics , mathematics , structural engineering , engineering
The coefficient of variation (CV) in length of steelhead Oncorhynchus mykiss and coho salmon O. kisutch sorted with the AutoFish tagging trailer (AFTT) system (Northwest Marine Technology, Shaw Island, Washington) was compared with that of unsorted fish. At release in April, the mean CV of sorted steelhead was 22% less than that of control fish, and the two values were significantly different. Since fish are only handled once with the AFTT, there are also labor savings relative to traditional hatchery practices in which fish are sorted and later fin‐clipped. In coho salmon, the mean CV of sorted fish was only 7% less than that of control fish (no significant difference), suggesting that there are few added advantages in using the AFTT for coho salmon.