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The effect of reducing dietary lipid and food availability on precocious male maturation in Chinook Salmon: A production‐scale hatchery experiment

The effect of reducing dietary lipid and food availability on precocious male maturation in... INTRODUCTIONSalmon hatchery programs have been implemented throughout the Columbia and Snake River basins in the Pacific Northwest to mitigate for stock losses as a result of hydropower development, urbanization, agriculture, fisheries, and forestry practices (Lichatowich 1999; Waples et al. 2007). Although some hatchery programs have successfully increased the numbers of returning adult fish (Kline and Flagg 2014; Fast et al. 2015), undesirable consequences of hatchery culture have been observed, including genotypic and phenotypic changes that have been implicated in the reduced fitness of hatchery fish when spawning in the wild (Reisenbichler and Rubin 1999; Ford 2002; Reisenbichler et al. 2004; Waples et al. 2004; Araki et al. 2008; Bowlby and Gibson 2011; Ford et al. 2012). Of particular note, several previous studies have documented the release of hundreds of thousands of male Chinook Salmon Oncorhynchus tshawytscha that have initiated early maturation as age‐2 minijacks each year from hatchery programs throughout the Columbia River basin (range = 7.9–71.4% of males, depending on the program; Larsen et al. 2004a, 2013, 2019a, 2019b; Harstad et al. 2014, 2018; Spangenberg et al. 2014, 2015; Beckman et al. 2017). This circumstance is unfortunate, as these early maturing males do not add to hatchery program goals, including contributions to harvest of adults or supplementation of natural populations by full‐size breeding adults. The http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Transactions of the American Fisheries Society Oxford University Press

The effect of reducing dietary lipid and food availability on precocious male maturation in Chinook Salmon: A production‐scale hatchery experiment

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References (17)

Publisher
Oxford University Press
Copyright
© 2023 American Fisheries Society
ISSN
0002-8487
eISSN
1548-8659
DOI
10.1002/tafs.10402
Publisher site
See Article on Publisher Site

Abstract

INTRODUCTIONSalmon hatchery programs have been implemented throughout the Columbia and Snake River basins in the Pacific Northwest to mitigate for stock losses as a result of hydropower development, urbanization, agriculture, fisheries, and forestry practices (Lichatowich 1999; Waples et al. 2007). Although some hatchery programs have successfully increased the numbers of returning adult fish (Kline and Flagg 2014; Fast et al. 2015), undesirable consequences of hatchery culture have been observed, including genotypic and phenotypic changes that have been implicated in the reduced fitness of hatchery fish when spawning in the wild (Reisenbichler and Rubin 1999; Ford 2002; Reisenbichler et al. 2004; Waples et al. 2004; Araki et al. 2008; Bowlby and Gibson 2011; Ford et al. 2012). Of particular note, several previous studies have documented the release of hundreds of thousands of male Chinook Salmon Oncorhynchus tshawytscha that have initiated early maturation as age‐2 minijacks each year from hatchery programs throughout the Columbia River basin (range = 7.9–71.4% of males, depending on the program; Larsen et al. 2004a, 2013, 2019a, 2019b; Harstad et al. 2014, 2018; Spangenberg et al. 2014, 2015; Beckman et al. 2017). This circumstance is unfortunate, as these early maturing males do not add to hatchery program goals, including contributions to harvest of adults or supplementation of natural populations by full‐size breeding adults. The

Journal

Transactions of the American Fisheries Society – Oxford University Press

Published: Mar 1, 2023

Keywords: Chinook Salmon; diet manipulation; growth; hatchery; IGF‐I; minijacks

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