Rearing strategies alter patterns of size-selective mortality and heritable size variation in steelhead trout (Oncorhynchus mykiss)

Berejikian, Barry A.; Hard, Jeffrey J.; Tatara, Christopher P.; Van Doornik, Donald M.; Swanson, Penny; Larsen, Donald A.

doi:10.1139/cjfas-2016-0175

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Rearing strategies alter patterns of size-selective mortality and heritable size variation in steelhead trout (Oncorhynchus mykiss)

2017
By Berejikian, Barry A. ; Hard, Jeffrey J. ; Tatara, Christopher P. ; ...
Source: Canadian Journal of Fisheries and Aquatic Sciences, 74(2), 273-283

[PDF-837.60 KB]

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Journal Title:

Canadian Journal of Fisheries and Aquatic Sciences
Personal Author:

Berejikian, Barry A. ; Hard, Jeffrey J. ; Tatara, Christopher P. ; Van Doornik, Donald M. ; Swanson, Penny ; ... More +

Berejikian, Barry A. ; Hard, Jeffrey J. ; Tatara, Christopher P. ; Van Doornik, Donald M. ; Swanson, Penny ; Larsen, Donald A. Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center) Less -
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Steelhead trout (Oncorhynchus mykiss) reared under two different regimes: high food ration for 1 year (S1; typical strategy) or low ration for 2 years (S2) were subjected to a seawater challenge during the corresponding spring outmigration period. The S1smolts were smaller and suffered greater seawater challenge mortality (23.9% compared with 0.7% for the S2smolts) that was significantly and negatively related to body size. Heritability of body size was similar for the two treatments during the parr stage (fork length: S1= 0.181, S2= 0.245; mass: S1= 0.372; S2= 0.447), but higher for the S1treatment during the smolt stage for length (S1= 0.212, S2= 0.002) and body mass (S1= 0.145, S2= 0.015). Strong family effects for both traits and significant family by environment interactions for parr mass and smolt length indicated significant phenotypic plasticity. A genetic response to size-selective mortality caused by insufficient growth opportunity in the S1treatment is plausible and may affect fitness in the natural environment through effects on correlated traits.
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Aquatic Science Ecology, Evolution, Behavior And Systematics
Source:

Canadian Journal of Fisheries and Aquatic Sciences, 74(2), 273-283
DOI:

https://doi.org/10.1139/cjfas-2016-0175
ISSN:

0706-652X;1205-7533;
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PDF
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Canadian Science Publishing
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Journal Article
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urn:sha256:212444e410b331a8d230093d7a7a2193d2f56a21f8c3a08e867bc62fa6c261cd
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https://repository.library.noaa.gov/view/noaa/52603/noaa_52603_DS1.pdf
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Rearing strategies alter patterns of size-selective mortality and heritable size variation in steelhead trout (Oncorhynchus mykiss)

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