Year Class Regulation Of Mid Upper Columbia River Spring Chinook Salmon Oncorhynchus Tshawytscha PDF Download
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Author | : Londi M. Tomaro |
Publisher | : |
Total Pages | : 194 |
Release | : 2011 |
Genre | : Chinook salmon |
ISBN | : |
Download Year-class Regulation of Mid-upper Columbia River Spring Chinook Salmon Oncorhynchus Tshawytscha Book in PDF, ePub and Kindle
Early ocean residence is assumed to be a critical period for juvenile Pacific salmon Oncorhynchus spp. However, the specific mechanisms influencing growth and survival in the ocean have not been identified for most populations. Therefore, three hypotheses regarding the relationship between early marine residence and subsequent survival of mid-upper Columbia River spring Chinook salmon were evaluated: the 'bigger is better', 'stage duration', and 'match-mistmatch' hypotheses. Six metrics describing juvenile migration history and condition were developed, including 1) size at freshwater exit; 2) size at ocean capture; 3) initial ocean growth rates; 4) timing of ocean entrance; 5) duration of ocean residence; and 6) marine migration rates. Retrospective estimates of size and growth using otolith analyses rely on the assumption that otolith and somatic size are related. Therefore, I verified this assumption for mid-upper Columbia River Chinook salmon and determined that a body-proportional back-calculation method was the best approach for this population. Fish length and otolith width were positively correlated (r > 0.92) and growth rates estimated from back-calculated sizes were positively correlated with observed growth rates (r = 0.96). I also evaluated the utility of using the otolith Sr:Ca pattern as a marker of hatchery-origin and investigated potential mechanisms for the observed Sr:Ca pattern. Visual and quantitative criteria were developed using otoliths of hatchery fish and were used to correctly classify 85% and 78%, respectively, of a sample of known hatchery-origin fish (n = 114) that were collected in coastal waters. Although Sr:Ca in water and hatchery food did not fully account for the observed pattern in otolith Sr:Ca, the pattern can be used to identify mid-upper Columbia River spring Chinook salmon of hatchery-origin with relatively high accuracy (>75%). The six juvenile metrics were used to evaluate mechanisms potentially regulating establishment of year-class abundance. The only metrics found to be significantly related to future adult abundance were size at freshwater exit (r2 = 0.56) and capture (r2 = 0.60). These data support the 'bigger is better' hypothesis and indicate that factors influencing size and growth during freshwater residence should be investigated further. Juveniles resided in the brackish/ocean for one to two months prior to capture in May and June; therefore, ocean conditions after this period may be related to the 40% of variation in adult abundance unexplained by interannual variation in body size.
Author | : The Law Library |
Publisher | : |
Total Pages | : 28 |
Release | : 2018-12-13 |
Genre | : Law |
ISBN | : 9781791638085 |
Download Endangered and Threatened Species - Designation of Nonessential Experimental Population of Upper Columbia River Spring-Run Chinook Salmon (Us National Oceanic and Atmospheric Administration Regulation) (Noaa) (2018 Edition) Book in PDF, ePub and Kindle
The Law Library presents the complete text of the Endangered and Threatened Species - Designation of Nonessential Experimental Population of Upper Columbia River Spring-run Chinook Salmon (US National Oceanic and Atmospheric Administration Regulation) (NOAA) (2018 Edition). Updated as of May 29, 2018 We, the National Marine Fisheries Service (NMFS), designate and authorize the release of a nonessential experimental population of Upper Columbia River (UCR) spring-run Chinook salmon (Oncorhynchus tshawytscha) under section 10(j) of the Endangered Species Act (ESA) in the Okanogan River subbasin, and establish a limited set of take prohibitions for the nonessential experimental population under section 4(d) of the ESA. Successful reintroduction of a population within the species' historic range would contribute to its viability and further its conservation. The issuance of limited protective regulations will provide for the conservation of the species while providing assurances to people in the Okanogan River subbasin. The geographic boundary for the NEP is the main stem and all tributaries of the Okanogan River between the Canada-United States border and to the confluence of the Okanogan River with the Columbia River, Washington (hereafter "Okanogan River NEP Area"). We have prepared a Final Environmental Assessment (EA) and Finding of No Significant Impact (FONSI) on the proposed action under the National Environmental Policy Act (NEPA) (see ADDRESSES: section below). This ebook contains: - The complete text of the Endangered and Threatened Species - Designation of Nonessential Experimental Population of Upper Columbia River Spring-run Chinook Salmon (US National Oceanic and Atmospheric Administration Regulation) (NOAA) (2018 Edition) - A dynamic table of content linking to each section - A table of contents in introduction presenting a general overview of the structure
Author | : Upper Columbia River Steelhead and Spring Chinook Salmon Biological Requirements Committee |
Publisher | : |
Total Pages | : 0 |
Release | : 2001 |
Genre | : Chinook salmon |
ISBN | : |
Download Upper Columbia River Steelhead and Spring Chinook Salmon Population Structure and Biological Requirements Book in PDF, ePub and Kindle
Author | : Willis Horton Rich |
Publisher | : |
Total Pages | : 96 |
Release | : 1925 |
Genre | : Chinook salmon |
ISBN | : |
Download Growth and Degree of Maturity of Chinook Salmon in the Ocean Book in PDF, ePub and Kindle
Author | : Charles O. Junge |
Publisher | : |
Total Pages | : 40 |
Release | : 1963 |
Genre | : Chinook salmon |
ISBN | : |
Download Factors Influencing the Return of Fall Chinook Salmon (Oncorhynchus Tshawytscha) to Spring Creek Hatchery Book in PDF, ePub and Kindle
Author | : United States. National Marine Fisheries Service. West Coast Region |
Publisher | : |
Total Pages | : 0 |
Release | : 2022 |
Genre | : Chinook salmon |
ISBN | : |
Download 2022 5-year Review Book in PDF, ePub and Kindle
Author | : Ted Bjornn |
Publisher | : |
Total Pages | : |
Release | : 1979 |
Genre | : Salmon |
ISBN | : |
Download Status of Upper Columbia and Snake River Spring Chinook Salmon in Relation to the Endangered Species Act Book in PDF, ePub and Kindle
Author | : James W. Mullan |
Publisher | : |
Total Pages | : 132 |
Release | : 1987 |
Genre | : Chinook salmon |
ISBN | : |
Download Status and Propagation of Chinook Salmon in the Mid-Columbia River Through 1985 Book in PDF, ePub and Kindle
Author | : Ned Horner |
Publisher | : |
Total Pages | : 63 |
Release | : 1981 |
Genre | : Chinook salmon |
ISBN | : |
Download Status of Upper Columbia and Snake River Spring Chinook Salmon in Relation to the Endangered Species Act Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 79 |
Release | : 2005 |
Genre | : Chinook salmon |
ISBN | : |
Download Upper Columbia River Spring-run Chinook Salmon White River Supplementation Program Book in PDF, ePub and Kindle