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United States Department of Agriculture

Agricultural Research Service

Research Project: UTILIZING GENETICS AND PHYSIOLOGY FOR ENHANCING COOL AND COLD WATER AQUACULTURE PRODUCTION

Location: Cool and Cold Water Aquaculture Research

Title: Effect of sexual maturation and polyploidy on chemical composition and fatty acid content of energy stores in female rainbow trout (Oncorhynchus mykiss)

Authors
item Manor, Meghan -
item Kenney, P. Brett -
item Weber, Gregory
item Yao, Jianbo -
item Aussanasuwannakul, Aunchalee -
item Salem, Mohamed -

Submitted to: Aquaculture America Conference
Publication Type: Abstract Only
Publication Acceptance Date: February 1, 2011
Publication Date: March 3, 2011
Citation: Manor, M., Kenney, P., Weber, G.M., Yao, J., Aussanasuwannakul, A., Salem, M. 2011. Effect of sexual maturation and polyploidy on chemical composition and fatty acid content of energy stores in female rainbow trout (Oncorhynchus mykiss). Aquaculture America Conference. 339.

Technical Abstract: Sexual maturation is an energy and nutrient demanding physiological process that alters growth efficiency and compromises muscle quality in many fish species. Lipid mobilization from fat stores supplies energy required for this process. To study the effect of sexual maturation on lipid mobilization in female rainbow trout on a high nutritional plane fish growth, egg development, proximate composition, and fatty acid composition of muscle, liver, visceral fat, and gonads were determined for 2N and 3N females from July 2008 thru March 2009, when most ovulated. Plasma sex steroid, growth hormone, and IGF-1 were also measured. A high nutritional plane was used to separate changes in response to nutrient or energy deficits from developmentally regulated changes associated with reproductive processes. There were no differences in most growth measurements between the 2N and 3N fish in this study, but there were changes in muscle proximate composition and visceral fat stores during sexual maturation. In addition, fatty acid composition of all tissues changed throughout sexual maturation. Saturated fatty acids relative amounts decreased while linoleic acid and DHA increased from July to March in 2N fillets, whereas palmitic acid and oleic acid decreased and highly unsaturated fatty acids increased in 3N fillets. Palmitoleic acid and oleic acid relative amounts decreased while DHA and stearic acid increased from July to September in 2N gonads.

Last Modified: 7/23/2014
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