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).
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.
Sprague
Matthew
M
Institute of Aquaculture, University of Stirling, Stirling FK9 4LA, UK.
Bendiksen
Eldar A
EA
Dick
James R
JR
Strachan
Fiona
F
Pratoomyot
Jarunan
J
Berntssen
Marc H G
MH
Tocher
Douglas R
DR
Bell
John Gordon
JG
D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D004032:Diet / Q000662:veterinary; D004147:Dioxins / Q000737:chemistry / Q000378:metabolism; D005227:Fatty Acids / Q000737:chemistry*; D005395:Fish Oils / Q000737:chemistry*; D055768:Halogenated Diphenyl Ethers / Q000737:chemistry / Q000378:metabolism; D006801:Humans; D018482:Muscle, Skeletal / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry*; D011078:Polychlorinated Biphenyls / Q000737:chemistry / Q000378:metabolism; D020317:Salmo salar / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
D004147:Dioxins; D005227:Fatty Acids; D005395:Fish Oils; D055768:Halogenated Diphenyl Ethers; D010938:Plant Oils; D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls