engleski

Bluefin tuna (Thunnus thynnus) plasma lipids and muscle fatty acid composition

Objective of the study was to determine the fatty acid and proximate composition of ventral ordinary tail muscle of Atlantic bluefin tuna, both farmed and wild, compare those findings with plasma parameters of farmed bluefin reared on a diet based on herring and sardine, and analyze the lipid profile of the species. The total lipid content of farmed bluefin was 0.922 g/100 g, or 3.49 g of SAFA, 4.48 g of MUFA, 2.58 g PUFA n-3, and 0.37 g of PUFA n-6 fatty acids ; for wild specimens it was 0.920 g/100 g, or 2.85 g of SAFA, 4.82 g of MUFA, 2.78 g PUFA n-3, and 0.27 g of PUFA n-6 fatty acids. Major fatty acids in this study were 16:0 ; 16:1, n-7 ; 18:1, n-9 and DHA 22:6, n-3 acids. The sum of these major components accounted for more than 57 % and 80 % of the total fatty acids in all samples of farmed and wild tuna, respectively. No significant differences in proximate composition were demonstrated between farmed and wild samples, except for energy value, in favor of the farmed tuna. Statistically, GLU tends to increase together with CHOL and TRIG, since for these pairs it showed positive correlation coefficients and P > 0.05. Some measured tuna metabolites demonstrated strong mutual correlations, especially GLU, CHOL and TRIG, which are crucial factors in lipid profile of animals. Measuring blood biochemical parameters showed an excellent indicator to the, along with the general condition of the organisms, overall metabolic equilibrium in bluefin tuna farmed for human consumption, which in proximate composition differed from wild specimens only in energy value, while significant differences were observable in their fatty acid profiles.

bluefin tuna; plasma lipids; muscle fatty acid composition

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