Microencapsulated algal feeds as a sustainable replacement diet for broodstock in commercial bivalve aquaculture release_pchylphwwvgqrh22yku2azqmee

by David F. Willer, Samuel Furse, David C. Aldridge

Published in Scientific Reports by Springer Science and Business Media LLC.

2020   Volume 10, Issue 1, p12577

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.
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