Lipid and fatty acid compositions of muscle from farmed and wild adult turbot

The aim of this study was to compare the total lipid, neutral lipid, phosph olipid contents, phospholipid class distribution and fatty acid composition of these lipids in muscle of wild and farmed turbot (Scophthalmus maximus) of similar body size. The results showed that muscle of farmed turbot had a higher lipid content than that of wild turbot (1.06% versus 0.64%) becaus e they contained more neutral lipids (0.52% versus 0.24%) and more phosphol ipids (0.54% versus 0.40%). Distribution of phospholipid classes in muscle of both wild and farmed turb ot was similar with 67-70% phosphatidyl choline, 22-25% phosphatidyl ethano lamine and 4.4-5.2% phosphatidyl inositol plus phosphatidyl serine and 2.4- 2.9% sphingomyeline. Compared to wild turbot, all of the lipid classes from farmed turbot contai ned lower proportions of long chain omega-3 PUFA and 20:4 omega-6 and conve rsely higher proportions of 20:1 and 22:1. The ratio between omega-3 and om ega-6 polyunsatured fatty acids was higher in all the lipid fractions of wi ld turbot than in those of farmed fish (8.8 versus 4.2 in total lipids, 11. 0 versus 3.3 in neutral lipids, 7.9 versus 4.7 in phospholipids).