Organ and phospholipid class fatty acid specificity in response to dietary depletion of essential n-3 fatty acids in Atlantic salmon (Salmo salarL.)

2016 ◽  
Vol 23 (3) ◽  
pp. 433-443 ◽  
Author(s):  
M.S. Thomassen ◽  
M. Bou ◽  
C. Røsjø ◽  
B. Ruyter
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Atlantic Salmon ◽  
Phospholipid Class ◽  
Fatty Acid Specificity

scholarly journals Atlantic salmon require long-chain n-3 fatty acids for optimal growth throughout the seawater period

2016 ◽  
Vol 5 ◽  
Author(s):  
Grethe Rosenlund ◽  
Bente E. Torstensen ◽  
Ingunn Stubhaug ◽  
Nafiha Usman ◽  
Nini H. Sissener
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Atlantic Salmon ◽  
Fold Increase ◽  
Optimal Growth ◽  
Dietary Fatty Acids ◽  
Nutritional Requirement ◽  
Retention Efficiency ◽  
Long Chain

AbstractThe nutritional requirement for n-3 long-chain PUFA in fast-growing Atlantic salmon (Salmo salar) during grow out in the sea is not well documented. Diets were formulated with levels of EPA (20 : 5n-3) and DHA (22 : 6n-3) ranging from 1·3 to 7·4 % of fatty acids (4–24 g/kg feed). Two long-term trials were conducted through the seawater phase, the first at 6 and 12°C, and the second at 12°C. In the first trial, growth at both temperatures was significantly lower in fish fed 1·4 % EPA+DHA of total fatty acids compared with the 5·2 % EPA+DHA group. In the second trial, growth was significantly lower in fish fed 1·3 and 2·7 % compared with 4·4 and 7·4 % EPA + DHA. Fatty acid composition in the fish reflected diet composition, but only after a 7-fold increase in body weight did the fatty acid profile of the fish stabilise according to dietary fatty acids (shown for EPA and DHA). The retention efficiency of DHA increased with decreasing dietary levels, and was 120–190 and 120–200 % in trials 1 and 2, respectively. The retention efficiency of EPA was lower (60–200 %), and values >100 % were only achieved at the lowest dietary levels in both trials. Temperature did not affect fatty acid retention efficiency. These results suggest that Atlantic salmon have a specific requirement for EPA + DHA >2·7 % of fatty acids for optimal long-term growth in seawater, and that short-term growth trials with less weight increase would not show these effects.

scholarly journals Altered levels of shorter vs long-chain omega-3 fatty acids in commercial diets for market-sized Atlantic salmon reared in seawater – Effects on fatty acid composition, metabolism and product quality

Aquaculture ◽  
2019 ◽  
Vol 499 ◽  
pp. 167-177
Author(s):  
Thomas S. Mock ◽  
David S. Francis ◽  
Matthew K. Jago ◽  
Brett D. Glencross ◽  
Richard P. Smullen ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Atlantic Salmon ◽  
Product Quality ◽  
Acid Composition ◽  
Omega 3 Fatty Acids ◽  
Omega 3 ◽  
Commercial Diets ◽  
Long Chain

scholarly journals Feeding Whole Thraustochytrid Biomass to Cultured Atlantic Salmon (Salmo salar) Fingerlings: Culture Performance and Fatty Acid Incorporation

2020 ◽  
Vol 8 (3) ◽  
pp. 207 ◽  
Author(s):  
Kim Jye Lee Chang ◽  
Christopher C. Parrish ◽  
Cedric J. Simon ◽  
Andrew T. Revill ◽  
Peter D. Nichols
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Atlantic Salmon ◽  
Fatty Acid Content ◽  
Isotope Analysis ◽  
Fish Growth ◽  
Whole Cell ◽  
Cell Biomass ◽  
Δ13c Value ◽  
Fatty Acid Incorporation

Replacement of fish oil by 5% thraustochytrid whole cell biomass in diets for Atlantic salmon had no ill effect on fish growth performance, carcass total lipid and total fatty acid content. Carcass fatty acid composition indicated incorporation of the dietary thraustochytrid-derived fatty acids. This was confirmed by compound specific stable isotope analysis (CSIA) which revealed significantly 13C-depleted (δ13C value of −24‰) ω3 long-chain (≥C20) polyunsaturated fatty acids (ω3 LC-PUFAs) in the fingerlings fed the thraustochytrid biomass containing diet, reflecting the highly 13C-depleted glycerol used to grow the thraustochytrid cultures. This finding demonstrates the bioavailability of the ω3 LC-PUFA of the Australian strain thraustochytrid culture (TC) 20 from the whole cell biomass that was partly cultivated on crude glycerol produced during biodiesel manufacturing. This paper demonstrates the value of Australian thraustochytrid strains grown heterotrophically for their wider biotechnological potential including as a source of higher value lipids, in particular the health-benefitting ω3 LC-PUFA, for use in aquaculture and other applications.

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