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Fatty‐acid profiles of white muscle and liver in stream‐maturing steelhead trout Oncorhynchus mykiss from early migration to kelt emigration
Author(s) -
Penney Z. L.,
Moffitt C. M.
Publication year - 2015
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/jfb.12552
Subject(s) - rainbow trout , biology , fatty acid , polyunsaturated fatty acid , white (mutation) , zoology , fishery , biochemistry , fish <actinopterygii> , gene
The profiles of specific fatty acids ( FA ) in white muscle and liver of fasting steelhead trout Oncorhynchus mykiss were evaluated at three periods during their prespawning migration and at kelt emigration in the Snake–Columbia River of Washington, Oregon and Idaho, to improve the understanding of energy change. Twenty‐seven FA s were identified; depletion of 10 of these was positively correlated in liver and white muscle of prespawning O. mykiss . To observe relative changes in FA content more accurately over sampling intervals, the lipid fraction of tissues was used to normalize the quantity of individual FA to an equivalent tissue wet mass. Saturated and monounsaturated FA s were depleted between upstream migration in September and kelt emigration in June, whereas polyunsaturated FA s were more conserved. Liver was depleted of FA s more rapidly than muscle. Three FA s were detected across all sampling intervals: 16:0, 18:1 and 22:6n3, which are probably structurally important to membranes. When structurally important FA s of O. mykiss are depleted to provide energy, physiological performance and survival may be affected.