Department of Fisheries Sciences, Islamic Azad University - Tonekabon Branch, Tonekabon 46817, Iran.
School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China
Faculty of Fisheries Science, Gorgan University of Agricultural Sciences and Natural Resources, Beheshti St., Gorgan 49138-15739, Iran.
The correlation between alive weight of farmed beluga (Huso huso) (ranging from 1 to 89 kg) and body composition and fatty acid content was examined for the first time. In all weight groups, the content of protein, fat, moisture, and ash varied as follows: protein 11.2% to 18.63%, fat 1.40% to 6.0%, moisture 65.77% to 80.4%, and ash 0.54% to 1.4%. Monounsaturated fatty acids (MUFAs) were the most predominant fatty acids (43.11%) followed by polyunsaturated fatty acids (PUFAs; 28.02%) and saturated fatty acids (SFAs; 20.72%). The content of protein, SFAs (C16:0, C18:0, and C20:0), and PUFAs (C18:2 n-6, C18:3 n-3, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA)) and the n-3/n-6 ratio showed a significant correlation (P < 0.01) with body weight. The content of n-3 (ranging from 6.99% to 11.72%) and n-6 (ranging from 10.82% to 28.21%) fatty acids, EPA (ranging from 0.85% to 2.66%), and DHA (ranging from 3.18% to 7.58%) and the n-3/n-6 ratio (ranging from 0.24 to 1.04) increased significantly with increasing body weight of beluga (P < 0.01), while MUFA and the DHA/EPA ratio were not correlated with the body weight of the fish. The results of this study indicated that protein content and essential n-3 PUFA were influenced by body weight.