Comparison of proximate and fatty acid compositions of wild brown trout and farmed rainbow trout

Abstract

________________________________________________________________________________ AbstractThe purpose of this study was to compare the fatty acid and proximate composition of two commercially exploited trout species (wild brown trout (WBT) and farmed rainbow trout (FRT)). The mean crude lipid content in FRT (4.3%) was significantly higher than that in WBT (2.7%). Total saturated fatty acid concentration (27.7%) in WBT was significantly higher than that in FRT (21.4%). However, monounsaturated fatty acid (MUFA) and polyunsaturated fatty acid (PUFA) concentrations in FRT were significantly greater than those of WBT. While the omega-6 PUFA concentration of WBT was fairly low, total omega-3 PUFA concentration was significantly higher compared with omega-6 PUFA. In contrast to WBT, the FRT contained high omega-6 and low omega-3 PUFA concentrations. Linolenic, docosahexaenoic (DHA), eicosapentaenoic (EPA) acids and C20:3n-3 components of omega-3 PUFAs were higher and significantly different between the two species. The ratio of omega-3 to omega-6 fatty acids in WBT was significantly higher compared to FRT. The results indicated that muscle lipids of both species are rich in EPA + DHA, thus beneficial in human nutrition. ________________________________________________________________________________

Effect of partial replacement of dietary fish meal by soybean meal with betaine attractant supplementation on growth performance and fatty acid profiles of juvenile rainbow trout (O ncorhynchus mykiss )

“…In present study, palmitic acid was identified as the primary FA in fish muscle and it constituted 60%–70% of total SFA. These findings comply with the findings of earlier studies (Alasalvar et al, ; Nettleton & Exler, ; Ozogul, Polat, Ucak, & Ozogul, ; Yeşilayer & Genç, ; Yıldız et al, ). Although fish SFA contents were relatively high (>% 35) (Table ), they comply with the findings of Nettleton and Exler (), and Oztekin et al ().…”

“…Although fish SFA contents were relatively high (>% 35) (Table 4), they comply with the findings of Nettleton and Exler (1992), and Oztekin et al (2018). Lower PUFA and n-6 ratios of fish meat after 60 days feeding trial were resulted from high EFA, protein and energy content of feeds used in initial feeding of the fish before the experiments (Yeşilayer & Genç, 2013).…”

“…The relative peak area percentages of compositions were found based on the FID data. The FAs were obtained as a percentage of total lipid (Yeşilayer & Genç, 2013).…”

Chemometrics tools to distinguish wild and farmed meagre (Argyrosomus regius)

“…Differences in lipid content between FM and WM are likely due to the higher availability of feed and lower activity of farmed fish and the longer starvation periods of wild fish (Haard, ). Increased lipid in farmed compared to wild meagre has been reported in others fish species as sea bass (Alasalvar et al, ; Bell et al, ; Özyurt & Polat, ), rainbow trout (Blanchet et al, ; Mustafa & Dikel, ; Yeşilayer & Genç, ), Atlantic salmon (Bell et al, ), gilthead sea bream (Mnari et al, ), and others. Thus, in meagre, as well as in a number of other fish species, lipid content could be used as a factor to discriminate between wild and farmed products.…”

“…Increased lipid in farmed compared to wild meagre has been reported in others fish species as sea bass (Alasalvar et al, 2002;Bell et al, 2003;€ Ozyurt & Polat, 2006), rainbow trout (Blanchet et al, 2005;Mustafa & Dikel, 2015;Yeşilayer & Genç, 2013), Atlantic salmon (Bell et al, 1998), gilthead sea bream (Mnari et al, 2007), and others. Thus, in meagre, as well as in a number of other fish species, lipid content could be used as a factor to discriminate between wild and farmed products.…”