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Minimizing marine ingredients in diets of farmed Atlantic salmon (Salmo salar): effects on liver and head kidney lipid class and fatty acid composition

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Abstract

Limited fish meal and fish oil supplies have necessitated research on alternatives for aquafeeds. Seven dietary treatments with different protein and lipid sources were formulated for farmed Atlantic salmon, and their effects on liver and head kidney lipid class, fatty acid, and elemental composition were studied. Fish meal, fish oil, and EPA + DHA content ranged from 5–35%, 0–12%, and 0.1–3%, respectively. Elemental analysis showed that the C to N ratio was higher in the head kidney than in the liver, which is consistent with higher content of total lipids in the head kidney compared with the liver. There was a greater susceptibility to dietary lipid alterations in the liver compared with the head kidney despite liver having a greater proportion of phospholipid and a much lower proportion of triacylglycerol. So long as fish oil levels were 5% or more of the diet, arachidonic acid (ARA) and docosahexaenoic acid (DHA) proportions were the same for each tissue as with feeding the marine diet with 12% fish oil; however, livers and head kidneys from fish fed the lowest amount of fish meal and fish oil had the lowest levels of eicosapentaenoic (EPA) and DHA and the highest ARA levels. Removal of fish oil and reduction of fish meal to 5% in diets of farmed Atlantic salmon affected elemental and lipid compositions of the liver and head kidney tissues potentially increasing susceptibility to inflammation. However, with 10% of the diet comprising fish meal and fish oil, lipid contents were comparable with fish fed marine-based diets.

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Acknowledgments

We would like to thank Cara Kirkpatrick for managing the project; Dr. Dominic Nanton for feed formulations; and Dr. Albert Caballero-Solares, Dr. Khalil Eslamloo, Xi Xue, Danny Boyce, and the Joe Brown Aquaculture Research Building staff for their valuable help with fish rearing and sampling. We also thank Dr. Fereidoon Shahidi and three anonymous reviewers for carefully reading the manuscript.

Funding

This study was conducted within the Biomarker Platform for Commercial Aquaculture Feed Development project, a Genomic Applications Partnership Program (GAPP # 6604), funded by the Government of Canada through Genome Canada, Genome Atlantic, Innovate NL (# 211219) and the Atlantic Canada Opportunities Agency (ACOA # 206200). Financial assistance was also provided by the Natural Sciences and Engineering Research Council of Canada (NSERC).

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Appendix

Appendix

Table 10 Correlation analysis r values among diet ingredients, elemental composition at week 14, diet (D) lipid classes, diet fatty acid composition, lipid classes of liver (L) and head kidney (HK), and fatty acid composition of liver and head kidney (data with*, **, and *** represent P ≤ 0.05, P ≤ 0.01, and P ≤ 0.001, respectively)
Table 11 Correlation analysis r values among diet ingredients, elemental composition at week 14, diet (D) lipid classes, diet fatty acid composition, lipid classes of liver (L) and head kidney (HK), and fatty acid composition of liver and head kidney (data with*, **, and *** represent P ≤ 0.05, P ≤ 0.01, and P ≤ 0.001, respectively)
Table 12 Correlation analysis r values among lipid classes of head kidney (HK) and fatty acid composition of head kidney (data with*, **, and *** represent P ≤ 0.05, P ≤ 0.01, and P ≤ 0.001, respectively)
Table 13 Lipid classes of liver tissue before and after 14 week of feeding trial (mg g−1 wet weight)
Table 14 Fatty acid composition of liver tissue before and after 14 weeks of feeding trial (mg g−1 wet weight)
Table 15 Lipid classes of head kidney tissue before and after 14 weeks of feeding trial (mg g−1 wet weight)
Table 16 Fatty acid composition of head kidney tissue before and after 14 weeks of feeding trial (mg g−1 wet weight)
Fig. 3
figure 3

Principal components analysis of lipid and fatty acid contents (mg g−1 wet weight) in liver tissue (bacterial is the sum of all the bacterial fatty acids, including i15:0, ai15:0, 15:0, 15:1, i16:0, ai16:0, i17:0, ai17:0, 17:0, 17:1, and 18:1ω6)

Fig. 4
figure 4

Principal components analysis of lipid and fatty acid contents (mg g−1 wet weight) in head kidney tissue (bacterial is the sum of all the bacterial fatty acids, including i15:0, ai15:0, 15:0, 15:1, i16:0, ai16:0, i17:0, ai17:0, 17:0, 17:1, and 18:1ω6)

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Foroutani, M.B., Parrish, C.C., Wells, J. et al. Minimizing marine ingredients in diets of farmed Atlantic salmon (Salmo salar): effects on liver and head kidney lipid class and fatty acid composition. Fish Physiol Biochem 46, 2331–2353 (2020). https://doi.org/10.1007/s10695-020-00862-0

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