Alternatives to fish oil substitution - An assessment of strategies for sustaining n-3 long chain polyunsaturated fatty acids (n-3 LC-PUFA) levels in salmonids ...

• Main Author: Codabaccus, MB
• Format: Thesis
• Language: unknown
• Published: University Of Tasmania 2023
• Subjects: Atlantic salmon
• Online Access: https://dx.doi.org/10.25959/23211158; https://figshare.utas.edu.au/articles/thesis/Alternatives_to_fish_oil_substitution_-_An_assessment_of_strategies_for_sustaining_n-3_long_chain_polyunsaturated_fatty_acids_n-3_LC-PUFA_levels_in_salmonids/23211158

The use of alternate oils (AO) in aquafeeds is now a reality due to the rise in the price of fish oil (FO). The lack of n-3 long-chain (>C20) polyunsaturated fatty acid (n-3 LC-PUFA) in AO is a major constraint due to the resulting low levels of n-3 LC-PUFA obtained in farmed fish. The aim of this study was to understand the metabolic basis underlying current and innovative strategies to maintain n-3 LCPUFA levels in salmonids, particularly for Atlantic salmon, fed diets in which fish oil (FO) is substituted with AO in a series of four independent experiments. Use of Echium oil (EO) rich in stearidonic acid (SDA) has the potential to bypass the initial ˜ívÆ6 desaturase enzyme which is a rate limiting step for n-3 LC-PUFA biosynthesis. This hypothesis was tested by growing Atlantic salmon in freshwater and seawater on diets where FO was completely substituted by either EO or rapeseed oil (RO) with comparison to a FO diet. The results indicated that SDA rich oil is a more suitable candidate for FO ...