Lipids in light and dark muscle of farmed rainbow trout (Oncorhynchus mykiss)

✍ Scribed by Torbjörn Ingemansson; N Urban Olsson; Bengt G Herslöf; Bo Ekstrand

• Publisher: John Wiley and Sons
• Year: 1991
• Tongue: English
• Weight: 246 KB
• Volume: 57
• Category: Article
• ISSN: 0022-5142
• DOI: 10.1002/jsfa.2740570317

✦ Synopsis

Dark muscle tissue of farmed rainbow trout (Oncorhynchus mykiss Walbaum) was found to have a higher total lipid content than light muscle-73 us 30 g kg-'-which was mainly due to a higher content of neutral lipids. In accordance with this the phospholipid content in the dark muscle tissue was 322 g kg -' of total lipids compared with 569 g kg-in light muscle tissue. Lipids from light muscle tissue contained higher percentages of polyunsaturated fatty acids than the dark muscle lipids, and docosahexaenoic acid was the major fatty acid present.

Knowledge of the lipid composition in commercially farmed fish is important in many aspects, eg for the post-mortem deterioration affecting food stability, the nutritional value of fish and the physiological effects of fish oil in clinical medicine. Generally, farmed fish have been reported to contain a lower level of n-3 fatty acids (FA) (Suzuki et a1 1986; van Vliet and Katan 1990). Today's farmed fish are usually given a feed containing fish oil of marine origin, which makes it difficult to differentiate between farmed and wild fish by their FA composition. Dietary * To whom correspondence should be addressed.