Fatty acid and proximate composition of bluefin tuna (Thunnus thynnus) muscle with regard to plasma lipids

Abstract

The composition of tail muscle fatty acids from wild and cultured bluefin tuna reared on a diet based on herring and sardine, along with the plasma lipid profile of the farmed individuals, was determined. The total lipid content of farmed bluefin in this study was 0.922 g/100 g or 3.49 g of saturated fatty acids (SAFA), 4.48 g of monounsaturated fatty acids (MUFA), 2.58 g polyunsaturated fatty acids (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. The 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 the samples of farmed and wild tuna respectively. No significant differences in the proximate composition were demonstrated between farmed and wild samples, except for the energy value, in favour of the farmed tuna. Statistically, glucose tends to increase together with cholesterol (CHOL) and plasma triglyceride, as 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 the lipid profile of animals.

Lipid and fatty acid composition, and persistent organic pollutant levels in tissues of migrating Atlantic bluefin tuna (Thunnus thynnus, L.) broodstock

“…Similar profiles were reported in both ABT muscle (Mourente et al, 2002;Salvo et al, 1998;Popovic et al, 2012) and liver (Mourente et al, 2002), regardless of capture site. Fatty acids such as 16:0 and 18:1n-9, together with 20:1n-9 and 22:1n-11 are presumed major sources of metabolic energy in fish, being catabolized during growth and gonad formation (Sargent et al, 1989).…”

The effects of diet supplemented with Lactobacillus rhamnosus on tissue parameters of rainbow trout, Oncorhynchus mykiss (Walbaum)

“…Unsignificant differences between treated and control groups indicate normal organ functions irrespective to reference values. The excess energy reserves (such as GLU, CHOL and TRIG) are required by an organism to mediate the effects of potential stress and serve as energy buffers (Topic Popovic, Kozacinski, Strunjak-Perovic, Coz-Rakovac, Jadan, Cvrtila-Fleck & Barisic 2012), which could partly explain the significant increase in CHOL in this study regarding the control fish but not regarding the reference values. Lipid components have also previously been found to be influenced by probiotic supplementation (Panigrahi et al 2010).…”

Proximate and Genetic Analysis of Blackfin Tuna (T. atlanticus)

“…The dry basis content of total fat BFT found in average was 1.4%, this content is lower than the fat content reported in T. orientalis (P=0.0057) and T. thynnus (P=0.0094) ( Figure 6). However, total fat content is greater in farmed fish (yellowfin tuna and bluefin tuna) than in wild fish (P=0.001), this could be explained by the type of diet given to farmed fish (Casalduero and Jerez, 2006, Estess et al, 2014, Nakamura et al, 2007, Roy et al, 2010, Topic Popovic et al, 2012, Vizzini et al, 2010 Besides the total fat content in BFT, we analyzed those fatty acids with human health implications, dietary omega 3 (n3), and omega 6 (n3) polyunsaturated fatty acids. We observed that BFT showed an average content of eicosapentaeonic acid (EPA) (n3) of 2.90±0.99 and an average of docosahexaenoic acid (DHA) (n3) of 11.17±8.31.…”