Run Timing, Fat Content and Maturity of Spring- and Fall-run Klamath River Chinook Salmon (Oncorhynchus Tshawytscha) PDF Download
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Author: James W. Hearsey
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 138
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Book Description
Author: James W. Hearsey
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 138
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Book Description
Author: Timothy L. Hoffnagle
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 22
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Author: Daniel W. Slater
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 20
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Book Description
Salmon specialists throughout the Pacific Coast indicate that the winter-run Chinook salmon is restricted to California's Sacramento River system. The characteristics and habits of the race are unique in the following respects: Fresh-water holding period, December to April; spawning period, April into July. The up-migration is concurrent with the late segments of the fall run, but the adults are distinguishable by the green condition of the gonads. The down-migration is concurrent with that of the spring-run fry, but the migrants are 2-inch or larger fingerlings. Evidence is lacking to determine whether there is an earlier down-migration of fry. The race appears to hold great promise as a stock to be introduced into areas where May-August temperatures are 42.5 degrees - 57.5 degrees F., for it supports superb angling during the fresh-water holding period. Water temperatures in May through August are seen as the factor limiting the natural extension of the range of the race.
Author: Charles O. Junge
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 40
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Author: Gina R. Lasko
Publisher:
ISBN:
Category :
Languages : en
Pages : 94
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Book Description
Pacific salmon (Oncorhynchus spp.) are generally anadromous fishes that spawn in fresh water. When young salmon have grown and matured to what is called the smolt stage (ocean ready), they move into the ocean to mature and grow into adulthood. When they have reached sexual maturity, they return to fresh water to spawn and then die. Salmon typically home to their natal streams when returning to fresh water to spawn. Straying, however, is a natural behavior for a small fraction of individuals in a population, and may even have an adaptive advantage under some circumstances. Straying can also occur as a result of various factors including natural habitat disruption, modification of the watershed, or human intervention in salmonid reproduction. In the winter of 2006/2007, tens of thousands of late-fall-run Chinook salmon (Oncorhynchus tshawytscha) reared in the Coleman National Fish Hatchery, a US Fish and Wildlife Service facility on Battle Creek in the upper Sacramento River basin, were released at several downstream locations as part of a Sacramento-San Joaquin River Delta survival study. Two years later, in the winter of 2008/2009, at the end of the annual Department of Fish and Game lower American River escapement survey for fall-run Chinook salmon, a new pulse of fish was found to be spawning in the American River. These fish turned out to be stray late-fall-run Chinook salmon from the Coleman National Fish Hatchery, spawning in the American River where the fall-run Chinook salmon were completing their spawning run. Late-fall-run Chinook salmon have not been known to spawn in the American River and understanding the reason for this unusual behavior was the basis for this project. Currently the only run of Chinook salmon in the lower American River is the fall-run. The Department does not want late-fall-run Chinook salmon to establish themselves in the river because of potential disruption of fall-run Chinook salmon nest success due to an overlap in run timing, potential interbreeding, and limited available spawning habitat. This study was based on the hypothesis that salmon released in close proximity to the mouth of the American River are more likely to stray into the river during their return spawning migration than fish released farther from the river's mouth. Coded-wire tag inland return data from for the 2006 brood year of late-fall-run Chinook collected from 2007/2008 through 2010/2011 were used for this study. The tags were collected primarily from salmon found during river escapement surveys and those that returned to hatcheries in the Sacramento River watershed. The return data were analyzed using Chi-square statistical analyses to determine if there was a difference in the number of salmon straying into the American River with respect to the distance they were released from the mouth of that river, and a Spearman noncollated rank analysis was used to describe the overall relationship between release distance from the American River and percent straying into the river. Results indicated that straying did increase with proximity of release location to the mouth of the American River and with respect to downstream releases in general. No salmon released in the vicinity of the Coleman National Fish Hatchery were recovered in the lower American River. This study indicates that release location should be carefully evaluated if future downstream releases are conducted by Sacramento River watershed hatcheries.
Author: Tasha Thompson
Publisher:
ISBN: 9781658415699
Category :
Languages : en
Pages :
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Human-driven environmental changes have altered and reduced phenotypic variation across diverse taxa, but the long-term consequences and the need for conservation action are unclear. This dissertation presents an investigation of the widespread and dramatic decline of the spring-run adult migration phenotype in wild Chinook salmon (Oncorhynchus tshawytscha), caused by dam construction and other anthropogenic activities. First, the Prologue reviews the findings of Prince et al. (2017), which identified the genetic and evolutionary basis of the spring-run phenotype. Next, Chapter 1 explores the mechanism and consequences of the decline and loss of the spring-run phenotype, finding that 1) changes in spring-run phenotype frequency are explained by changes in allele frequency at a single locus, and 2) loss of the spring-run phenotype can be rapidly followed by loss of spring-run alleles (and thus the ability to recover the phenotype). In Chapter 2, a combination of single-locus and genome-wide data is used to explore the utility of a genetic marker for run-type in addressing conservation and management questions in a population of conservation concern (the Chehalis Basin, WA), serving as an example of the ways in which the findings of Chapter 1 can be applied to immediate management questions. Finally, the Epilogue briefly describes the context of this dissertation and its relationship to broader conservation issues.
Author: Kendall Linn Ross
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 182
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Author:
Publisher:
ISBN:
Category : Endangered species
Languages : en
Pages : 292
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Author: James B. Shaklee
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 82
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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.
