REPORT published in Science Advances

Feeding global aquaculture

Abstract

The growth of animal aquaculture requires ever more feed. Yet, fish and crustacean farming is argued to be sustainable because wild fish use is low and has improved over time. Here, accounting for trimmings and by-products from wild fish in aquaculture feed, and using four different sources of industry-reported feed composition data, we find ratios of fish inputs to farmed outputs of 0.36 to 1.15—27 to 307% higher than a previous estimate of 0.28. Furthermore, a metric that incorporates wild fish mortality during capture and excludes unfed systems raises the wild fish mortality–to–farmed fish output ratio to 0.57 to 1.78. We also evaluate terrestrial ingredients in aquaculture feeds. Widely cited estimates of declines in wild fish use from 1997 to 2017 entailed a trade-off of more than fivefold increase in feed crops over the same period. Our assessment challenges the sustainability of fed aquaculture and its role in food security…

Growth without Guardrails: The UN’s aquaculture policy is undermining food security

The Food and Agriculture Organization of the United Nations (FAO) was founded after the Second World War with a clear mandate: to raise levels of nutrition, improve access to food, conserve natural resources and help free humanity from hunger. It is promoting major expansion of aquaculture as a means of advancing food security, nutrition and climate action—but without establishing adequate safeguards to ensure that this growth supports those objectives. The FAO climate roadmap calls for at least 75% growth in global ‘sustainable aquaculture’ production by 2040 compared with 2020. Because FAO’s policies shape what governments, development banks, donors and businesses accept as sustainable, its target will influence aquatic food systems, food security, fishing livelihoods and the health of marine ecosystems for decades to come.

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GSFR Impact Report 2025

Four years ago, we never imagined that the work we started would come this far.

Learn more about our activities and achievements from April 1st 2025 to March 31st 2026.

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To feed the world, recognize the interconnectedness of aquaculture and fisheries

Efforts to scale up aquaculture are increasingly framed as essential to global food security and ocean sustainability, yet such narratives often obscure the complex and interdependent relationships between aquaculture and wild-capture fisheries. This paper critically interrogates the dominant “feed the world” framing of aquaculture expansion, arguing that treating aquaculture and fisheries as isolated systems undermines social equity, ecological sustainability, and effective food policy.

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