Microencapsulated algal feeds as a sustainable replacement diet for broodstock in commercial bivalve aquaculture


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Authors
Willer, David F. 
Furse, Samuel 
Aldridge, David C. 
Abstract

Abstract: The global bivalve shellfish industry makes up 25% of aquaculture, is worth USD $17.2 billion year−1, and relies upon a supply of juvenile bivalves produced by adult broodstock in hatcheries. Today large quantities of live algae are grown to feed broodstock at $220 kg−1, driving highly unsustainable energy and resource use. New advances in algal and microencapsulation technology provide solutions. We developed microencapsulated Schizochytrium algae diets, which can be produced sustainably at < $2 kg−1 from organic side-streams, and are shelf-stable to minimise waste. Physiological, histological, and cutting-edge metabolomic analyses demonstrate that in commercial settings sustainable microencapsulated diets facilitate improved sexual development and 12 × greater omega-3 levels in oysters relative to conventional live algal diets. Every tonne bivalve protein produced instead of fish spares 9 ha, 67 tonnes CO2, and 40,000 L freshwater. Further research into microencapsulated diets could support bivalve industry expansion, and contribute towards a step-change in sustainable global food production through improved aquaculture practices.

Description

Funder: Biotechnology and Biological Sciences Research Council

Keywords
Article, /631/61, /704/829/826, article
Journal Title
Scientific Reports
Conference Name
Journal ISSN
2045-2322
Volume Title
10
Publisher
Nature Publishing Group UK