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Microencapsulated algal feeds as a sustainable replacement diet for broodstock in commercial bivalve aquaculture
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Microencapsulated algal feeds as a sustainable replacement diet for broodstock in commercial bivalve aquaculture
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Journal Article
Microencapsulated algal feeds as a sustainable replacement diet for broodstock in commercial bivalve aquaculture
2020
Overview
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 CO
2
, 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.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ Algae
/ Animals
/ Bivalvia
/ Bivalvia - growth & development
/ Diet
/ Feeds
/ Humanities and Social Sciences
/ Mollusks
/ Oysters
/ Science
