Age Composition and Spawning Escapement of Chinook Salmon in the Karluk, Ayakulik and Chignik Rivers, Alaska, 1997 and 1998 PDF Download
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Author: Mark Clapsadl
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 64
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Author: Mark Clapsadl
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 64
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Author: Donn Tracy
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 59
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Author: Donn Tracy
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 86
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Author: Tim Motis
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 69
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Author: Julia S. Schmidt
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 41
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Author: Donn Tracy
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 48
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Author: Len J. Schwarz
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 88
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Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 612
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Author: Jim Waldvogel
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 48
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Age analysis for 22 years (1980 excluded) showed that the overall percentages for female spawners was 53% (4-year olds), 38% (3-year olds), and 9% (5-year olds). The age composition of male spawners showed a high degree of variability throughout the study. Male chinook of age 2, 3 and 4 were dominant annually, but 5- and 6- year old fish were present in most spawning seasons. All chinook carcasses from which scales were collected were also measured for length (over 120 samples in 22 years). Decreases in mean length were documented for all age classes for each of the El Nino episodes that occurred during the study (1982-1984; 1992-1993; 1997-1998). The decreases in mean length appeared to carry forward for each cohort's age class. The total number of chinook redds was tabulated by counting "fresh" redds during weekly spawning surveys. The mean number of redds was 117 for the 23-year period with a mean of 0.9 redds per adult salmon or 1.8 redds per female.
Author: Nicholas H. Sagalkin
Publisher:
ISBN:
Category : Chinook salmon fisheries
Languages : en
Pages : 56
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