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Efficiency of Chinook Salmon Spawning in Fall Creek, California
Author(s) -
Wales J. H.,
Coots Millard
Publication year - 1955
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(1954)84[137:eocssi]2.0.co;2
Subject(s) - chinook wind , oncorhynchus , tributary , fishery , environmental science , fish <actinopterygii> , fish migration , geography , hydrology (agriculture) , biology , geology , cartography , geotechnical engineering
The spawning efficiency of chinook salmon (Oncorhynchus tshawytscha) in Fall Creek, a tributary of the Klamath River in northern California, was measured during four runs, 1950–1954, inclusive. In these years the following numbers of pairs of spawners were allowed to enter the stream: 750, 500, 300, and 300, respectively. Estimates of the total egg production of these fish were based on sampling. The numbers of downstream migrant fingerlings resulting from each of these spawning runs were computed by trapping the migrants in a known fraction of the stream flow. The percentages of potential eggs resulting in migrants leaving Fall Creek in the years sampled were 7, 10, 9, and 32, respectively. There appears to be an inverse correlation between the size of floods during incubation and the efficiency of spawning.