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The effect of total replacement of fish oil with DHA-Gold and plant oils on growth and fillet quality of rainbow trout (Oncorhynchus mykiss) fed a plant-based diet

Aquaculture Nutrition, ISSN: 1365-2095, Vol: 22, Issue: 1, Page: 158-169
2016
  • 39
    Citations
  • 0
    Usage
  • 50
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    39
    • Citation Indexes
      39
  • Captures
    50

Article Description

This study investigated the effect of the replacement of fish oil (FO) with DHA-Gold (DHA-G)-supplemented plant oils (PO) in rainbow trout fed plant-protein-based diets. Five diets (450 mg g digestible protein and 150 mg g crude lipid) were fed to rainbow trout (initial weight 37 ± 0.5 g) for 12 weeks in a 15 °C recirculating water system. The lipid inclusion types and levels were FO, PO and PO with DHA-G supplemented at 30 mg g, 60 mg g or 90 mg g of the diet replacement for corn oil. Fish fed 90 mg g DHA-G were significantly larger and consumed more feed than fish-fed PO or FO (218 g and 2.6% bwd versus 181 g and 2.4% and 190 g and 2.3%, respectively). Feed conversion ratio was significantly increased in fish fed 90 mg g DHA-G (0.99) as compared to fish-fed FO (0.90) and 30 mg g DHA-G (0.91). Panellists found trout fillets from fish fed the 90 mg g DHA-G diet to have significantly fishier aroma and flavour than fish fed the FO diet. Fatty acid analysis demonstrated that 60 mg g or 90 mg g DHA-G supplementation increased PO fed fish fillet DHA to fatty acid levels equivalent or higher than those fish fed a FO diet.

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