Evaluation of poultry fat and blends of poultry fat with cold-pressed flaxseed oil as supplemental dietary lipid sources for juvenile sablefish (Anoplopoma fimbria)

Authors

  • Erin Friesen,

    Corresponding author
    • Food, Nutrition and Health, Faculty of Land and Food Systems, The University of British Columbia, Vancouver, British Columbia, Canada
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  • Shannon K Balfry,

    1. Food, Nutrition and Health, Faculty of Land and Food Systems, The University of British Columbia, Vancouver, British Columbia, Canada
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  • Brent J Skura,

    1. Food, Nutrition and Health, Faculty of Land and Food Systems, The University of British Columbia, Vancouver, British Columbia, Canada
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  • Michael Ikonomou,

    1. Department of Fisheries and Oceans, Institute of Ocean Sciences, Sidney, British Columbia, Canada
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  • Dave A Higgs

    1. Department of Fisheries and Oceans, Centre for Aquaculture and Environmental Research, University of British Columbia, West Vancouver, British Columbia, Canada
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Correspondence: E Friesen, The University of British Columbia 2205 East Mall, Vancouver BC Canada V6T 1Z4. E-mail: friesen.erin@gmail.com

Abstract

The objective of this study was to access the suitability of using poultry fat (PF) or blends of PF with flaxseed oil (FO) to replace 75% of the supplemental anchovy oil (AO) in the diet of juvenile sablefish (Anoplopoma fimbria), a relatively new marine species to aquaculture. Sablefish were fed one of four diets twice daily to satiation for 15 weeks. The test diets were identical in composition except for the source of supplemental lipid which was either 100% AO (100AO), or had 75% of the supplemental AO replaced with 50% FO:25% PF, 25% FO:50% PF or 75% PF. Sablefish growth parameters, whole body and fillet proximate constituent concentrations, and apparent digestibility coefficients were uninfluenced by diet treatment. There were also no adverse effects of the diet treatments on fish health, as determined from analysis of various haematological and innate immunological parameters. Terminal fillet fatty acid compositions generally reflected the dietary fatty acid compositions. Results indicated that PF or blends of PF and FO may comprise 75% of the supplemental lipid in a grower diet for sablefish and are an economic alternative to AO while still providing humans with a rich dietary source of highly unsaturated fatty acids.

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