Dose-Dependent Retention of Omega-3 Fatty Acids by Black Soldier Fly Larvae (Diptera: Stratiomyidae)

Patrick Erbland, Andrei Alyokhin, L. Brian Perkins, Michael Peterson

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Black soldier fly larvae, Hermetia illucens (L.), are used to convert organic waste streams into insect-based animal feeds. We tested their ability to retain alpha-linolenic acid (ALA), eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA) from feeding substrates, which has important implications for their use in aquaculture. When supplementing a chicken feed diet with increasing concentrations of salmon oil (0-42%) over an increasing number of days (0-8), the concentrations of the three omega-3 acids in larvae increased significantly. Larval survival and biomass accumulation were not affected. Supplementing a chicken feed diet with increasing concentrations (0-14%) of Tetraselmis chui Butcher (Chlorodendrales: Chlorodendraceae) microalgae paste also significantly increased ALA and EPA contents of the harvested larvae. However, microalgae also decreased survival, harvested biomass, and individual growth of larvae feeding on the diet with the highest supplement concentration (14%). DHA was not detected in any microalgae diet or subsequent larval tissue samples. All three omega-3 polyunsaturated fatty acids tested in this study were accumulated in dose-dependent manner, with quadratic, and occasionally linear, equations providing the best description of the observed relationships. There were significant negative correlations between several fatty acids, indicating that they may replace one another in living larvae. Our findings confirm that black soldier fly larvae can retain ingested fatty acids and change fatty acid profiles in their tissues accordingly. However, optimizing nutrient content of harvestable larvae is likely to be more complicated than simply enriching their diets with omega-3 fatty acids.

Original languageEnglish
Pages (from-to)1221-1226
Number of pages6
JournalJournal of Economic Entomology
Volume113
Issue number3
DOIs
StatePublished - Jun 6 2020

Bibliographical note

Publisher Copyright:
© 2020 The Author(s) 2020. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

Keywords

  • biological conversion
  • black soldier fly
  • fatty acid
  • sustainable aquaculture
  • sustainable waste management

ASJC Scopus subject areas

  • General Medicine

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