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Wild salmonids are usually superior to cultured salmonids in marine survival. The reasons for the poor marine survival in cultured salmonids are uncertain but differences in biochemical compositions may be one factor. Comparisons were made between wild and cultured coho salmon (Oncorhynchus kisutch) and steelhead trout (Salmo gairdneri) to identify these differences. Cultured coho salmon reared in a hatchery production-channel, a semi-natural rearing channel and in burrows ponds were for the most part larger in length and weight, higher in whole body fat content, lower in moisture, higher in 6 fatty acids and lower in 3 fatty acids than their wild counterparts.
Ludwig, Bryan. 1982. A Morphological and Biochemical Comparison of Artificially and Naturally-reared Salmonids. Fisheries Management Report. FMR77
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