Effects of Replacement of Fish Oil with Microbial Oil ( Schizochytrium sp. T18) on Membrane Lipid Composition of Atlantic Salmon Parr Muscle and Liver Tissues

Nigel Guerra (), Christopher C. Parrish (), Minmin Wei, Judy Perry, Roberto E. Armenta and Stefanie M. Colombo
Additional contact information
Nigel Guerra: Department of Ocean Sciences, Memorial University of Newfoundland, St. John’s, NL A1C 5S7, Canada
Christopher C. Parrish: Department of Ocean Sciences, Memorial University of Newfoundland, St. John’s, NL A1C 5S7, Canada
Minmin Wei: Department of Animal Science and Aquaculture, Dalhousie University, Truro, NS B2N 5E3, Canada
Judy Perry: Department of Ocean Sciences, Memorial University of Newfoundland, St. John’s, NL A1C 5S7, Canada
Roberto E. Armenta: Mara Renewables Corporation, 101A Research Drive, Dartmouth, NS B2Y 4T6, Canada
Stefanie M. Colombo: Department of Animal Science and Aquaculture, Dalhousie University, Truro, NS B2N 5E3, Canada

Sustainability, 2023, vol. 15, issue 5, 1-29

Abstract: A 16-week feeding trial was conducted to investigate effects of replacing dietary fish oil (FO) with docosahexaenoic acid (DHA)-rich microbial oil (MO) from Schizochytrium sp. (T18) on membrane lipid composition of Atlantic salmon parr liver and muscle tissues. Four nutritionally balanced diets were formulated with varying levels of FO, MO, and canola oil (CO), including a control diet with 20% FO, a secondary control diet with 10% FO and 10% CO, and two experimental diets that completely replaced FO with a low (5%) and high (10%) proportion of MO. No significant differences were observed in growth parameters (81–98 g; weight gain), total lipid class composition, and total sterol content among the dietary treatments. However, there were significant differences in the proportions of individual ꞷ3 and ꞷ6 fatty acids in both liver and muscle tissues, reflecting the different dietary treatments. Notably, the presence of low eicosapentaenoic acid (EPA) in the MO diets did not affect the growth performance of the fish, suggesting a lower requirement for EPA in the diet and a greater necessity for DHA. The results also showed that DHA was present in very high proportions in the cellular membrane, particularly in muscle tissue, with low levels of linoleic acid and alpha-linolenic acid. Overall, the findings suggest that MO derived from Schizochytrium sp. (T18) could be a potential substitute for FO in the diet of farmed Atlantic salmon.

Keywords: Atlantic salmon; fish oil; microbial oil ( Schizochytrium sp. T18); EPA; DHA; ARA; polar lipid fatty acids; sterols (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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