Farmed Fish Feed: Welfare Implications of Nutrition and Ingredient Sourcing

Fish feed quality directly affects the health and welfare of farmed fish. The sourcing of feed ingredients also has significant welfare implications for wild fish populations used in fishmeal production.

Key Facts

Fishmeal and fish oil from wild-caught fish have traditionally been primary ingredients
Plant-based alternatives (soy, rapeseed, insects) now partially replace wild fish ingredients
Nutritional deficiencies from incomplete plant-based diets cause welfare problems
Sustainable fishmeal requires small pelagic fish caught within ecosystem limits
Insect-derived protein is a promising welfare-positive alternative ingredient
Feed conversion ratios in salmon farming (around 1.2:1) are among the most efficient in animal production

Welfare Considerations

Farmed fish welfare depends on receiving nutritionally complete feed that meets their specific requirements as obligate carnivores (for salmonids) or omnivores. Nutritional deficiencies cause diverse welfare problems from cataracts to vertebral deformities. The sourcing of fishmeal from wild fish also has welfare implications - small pelagic fish used for reduction fisheries are sentient animals whose welfare during harvesting deserves consideration. Ingredient choices in farmed fish feed are therefore welfare decisions with impacts across multiple species.

What You Can Do

Support certification schemes that require welfare-responsible feed sourcing
Advocate for transparency in farmed fish feed ingredient disclosure
Encourage research into welfare-positive alternative protein sources for fish feed
Ask retailers about feed standards in their aquaculture supply chains
Support fisheries management that maintains sustainable forage fish populations