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Age and Growth of Steelhead Trout, Salmo Gairdnerii Richardson, Caught by Sport and Commercial Fishermen in Tillamook County, Oregon
Author(s) -
Sumner F. H.
Publication year - 1948
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1945)75[77:aagost]2.0.co;2
Subject(s) - fish measurement , salmo , fishery , fish <actinopterygii> , trout , sexual maturity , salt water , biology , zoology , geography , environmental science , ecology , environmental engineering
During the winter of 1941–42, measurements and scale samples were collected from sport and commercial catches of steelhead trout (Salmo gairdnerii Richardson) caught in Tillamook County, Oregon. The commercial fish were taken in gill nets. It was found that the angler took both smaller (11.25–34.5 inches, fork length) and younger fish (2–5 years old) on the average, than did the nets (21.5–36 inches, fork length; 3–9 years old). The angler also took a higher proportion of females (1.56 females to 1 male) than did the nets (1.35 females to 1 male). The best represented age group in both sport and commercial catches was the IV group (57.2 percent of the sport and 52.7 percent of the commercial catch). The largest group by size (26.0–27.9 inches) was the same in both catches. Of the sport catch 12.7 percent, and of the commercial catch 21.4 percent, had spawned previously. Fifty‐seven and one‐tenth percent of the sport catch and 55.6 percent of the commercial catch had spent about 2 years in fresh water and 2 in salt water before reaching sexual maturity.