Effects of decontaminated fish oil or a fish and vegetable oil blend on persistent organic pollutant and fatty acid compositions in diet and flesh of Atlantic salmon (Salmo salar)

• Published in: British journal of nutrition Vol. 103; no. 10; pp. 1442 - 1451
• Main Authors: Sprague, Matthew, Bendiksen, Eldar Å., Dick, James R., Strachan, Fiona, Pratoomyot, Jarunan, Berntssen, Marc H. G., Tocher, Douglas R., Bell, John Gordon
• Format: Journal Article
• Language: English
• Published: Cambridge, UK Cambridge University Press 28.05.2010
• Subjects: Animal Feed - analysis; Animal Nutritional Physiological Phenomena; Animals; Aquaculture; Atlantic salmon; Biological and medical sciences; Decontaminated fish oil; decontamination; Diet; Diet - veterinary; Dietary supplements; Dioxins; Dioxins - chemistry; Dioxins - metabolism; Ethers; experimental diets; farmed fish; Fatty acid composition; Fatty acids; Fatty Acids - chemistry; Feeding. Feeding behavior; Fish; fish feeding; Fish oils; Fish Oils - chemistry; food analysis; food composition; food contamination; Fundamental and applied biological sciences. Psychology; Halogenated Diphenyl Ethers - chemistry; Halogenated Diphenyl Ethers - metabolism; Humans; Muscle, Skeletal - chemistry; Nutrition research; Nutritional Toxicology; Nutritive value; Oil pollution; Organic contaminants; PCB; Persistent organic pollutants; Plant Oils - chemistry; Polybrominated diphenyl ethers; Polychlorinated biphenyls; Polychlorinated Biphenyls - chemistry; Polychlorinated Biphenyls - metabolism; Polychlorinated dibenzodioxins; Salmo salar; Salmo salar - metabolism; Salmon; Seafood; seafoods; vegetable oil; Vegetable oils; Vertebrates: anatomy and physiology, studies on body, several organs or systems; Water Pollutants, Chemical - chemistry; Dioxins; Polychlorinated biphenyls; Fatty acid composition; Atlantic salmon; Decontaminated fish oil; Salmo salar; Lipids; Vegetable oil; Fatty acids; Fish oil; Organic acids; Feeding; Vertebrata; Mammalia; Diet; Pisces
• ISSN: 0007-1145; 1475-2662
• DOI: 10.1017/S0007114510000139

The health benefits of seafood are well documented and based on the unique supply of n-3 highly unsaturated fatty acids (HUFA). Aquaculture now contributes about 50 % of food-grade seafood globally and Atlantic salmon (Salmo salar) is a rich source of n-3 HUFA. However, salmon and other oily fish can accumulate lipophilic persistent organic pollutants (POP), including dioxins (PCDD/F), polychlorinated biphenyls (PCB) and polybrominated diphenyl ethers (PBDE), derived largely from feed. In the present study, triplicate groups of salmon, of initial weight 0·78 kg, were fed one of three experimental diets for 11 weeks. The diets were coated with either a northern fish oil (FO) with a high POP content (cNFO), the same oil that had been decontaminated (deNFO) or a blend of southern fish oil, rapeseed and soyabean oils (SFO/RO/SO). Dietary PCDD/F+dioxin-like PCB (DL-PCB) concentrations were 17·36, 0·45 and 0·53 ng toxic equivalents (TEQ)/kg, respectively. After 11 weeks, the flesh concentrations in fish fed the cNFO, deNFO and SFO/RO/SO diets were 6·42, 0·34 and 0·41 ng TEQ/kg, respectively. There were no differences in flesh EPA and DHA between fish fed the cNFO or deNFO diets although EPA and DHA were reduced by 50 and 30 %, respectively, in fish fed the SFO/RO/SO diet. Thus, decontaminated FO can be used to produce salmon high in n-3 HUFA and low in POP. Salmon produced using deNFO would be of high nutritional value and very low in POP and would utilise valuable fish oils that would otherwise be destroyed due to their high pollutant concentrations.