Aquaculture Feed Sustainability and Fish Welfare Connections

The feeds used in aquaculture link fish welfare directly to wild fish populations and novel protein sources. Understanding these connections is essential for holistic aquaculture welfare assessment.

Key Facts

Traditional salmon aquaculture relies heavily on fishmeal and fish oil from wild-caught forage fish
Forage fish such as anchovies, herrings, and sand eels are sentient animals whose welfare during industrial capture is largely unassessed
Around 20% of the global wild fish catch is reduced to fishmeal and fish oil, primarily for aquaculture and livestock feeds
Novel protein alternatives including insect meal, algae, and single-cell proteins can replace some fish-derived ingredients
Feed conversion ratios in aquaculture vary by species — salmon require significantly more feed input than tilapia or carp per kg of output
Feed quality directly affects farmed fish immune function, growth, and welfare — nutrient deficiencies cause specific welfare problems

Welfare Considerations

Aquaculture feed represents a welfare concern that extends beyond the farm fence. Industrial reduction fisheries that harvest billions of forage fish for fishmeal and oil raise welfare questions that are largely invisible in aquaculture sustainability discussions. These fish are caught in massive trawl operations and may experience crowding, pressure injury, and asphyxiation on deck — welfare harms with no current regulatory framework. Within aquaculture, feed quality directly affects fish welfare: inadequate essential fatty acid levels compromise brain development and stress responses; low vitamin C causes skeletal deformities; energy imbalances contribute to fatty liver disease. The transition toward insect meal (particularly black soldier fly larvae) and algae-based omega-3s reduces dependence on wild forage fish but raises new questions about insect welfare at industrial scale. A full welfare accounting of aquaculture must include feed chain impacts alongside on-farm conditions.

What You Can Do

Support aquaculture products that use certified sustainably sourced feed ingredients with transparent supply chains
Ask seafood brands and retailers to disclose their feed sustainability policies including fishmeal and fish oil sourcing
Support research into insect-based aquaculture feeds alongside insect welfare standards for industrial production
Advocate for fisheries management that maintains forage fish populations rather than allowing industrial reduction at ecologically harmful levels
Choose plant-forward aquaculture species (tilapia, carp, mussels) that require less wild fish in their feed inputs