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Effect of Dietary Insect Meal and Grape Marc Inclusion on Flavor Volatile Compounds and Shell Color of Juvenile Abalone Haliotis iris

Summary

Researchers tested whether using insect meal and grape marc as sustainable alternatives to fish meal in abalone feed would affect meat flavor and shell color. The study found that grape marc reduced unpleasant off-flavors in the meat while insect meal had minimal effect on flavor. Neither ingredient significantly changed shell color. These findings suggest these sustainable ingredients could improve both environmental impact and product quality in abalone farming.

Background

Fish meal is an unsustainable ingredient used in aquaculture feeds, comprising almost 60% of global fish meal production. Insect meal (IM) and grape marc (GM) are sustainable alternatives with potential to replace fish meal while maintaining product quality. However, the inclusion of these ingredients may affect flavor volatile compounds and shell color in abalone.

Objective

To evaluate the effect of dietary inclusion of insect meal from Tenebrio molitor and grape marc on flavor volatile compounds and shell color of juvenile Haliotis iris over a 165-day feeding trial. The study hypothesized that fatty acid profiles in these ingredients would significantly alter flavor profiles and shell coloration.

Results

Eighteen volatile compounds were significantly different among dietary treatments. Grape marc inclusion reduced volatile compounds associated with lipid peroxidation in abalone meat, while insect meal inclusion did not significantly affect volatile profiles. Neither ingredient significantly affected shell lightness, yellowness, blueness, redness, or greenness compared to commercial feed.

Conclusion

Dietary grape marc supplementation can reduce off-flavor compounds associated with lipid peroxidation, potentially extending shelf-life of raw abalone meat. Insect meal and grape marc are valuable sustainable ingredients for aquaculture feeds, though further studies are needed to evaluate effects on market-size adult abalone.
  • Published in:Aquaculture Nutrition,
  • Study Type:Experimental Feeding Trial,
  • Source: 10.1155/2023/6628232
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