Fish

Fish Cognition: Intelligence and Welfare Implications

Fish possess cognitive abilities far exceeding common assumptions, with profound implications for how we treat them in fishing and farming.

Key Facts

Cleaner wrasse pass the mirror self-recognition test in some experimental conditions
Archerfish can recognize human faces with over 80% accuracy
Some fish species use tools, plan ahead, and have episodic memory
Fish show social learning, can count, and display personality differences
Approximately 1 trillion fish are killed annually for food and bycatch globally

Welfare Considerations

The cognitive complexity of fish means the welfare harms of fishing and fish farming are far greater than previously assumed. Fish that can recognize faces, plan for the future, and show individual personality differences are not experiencing the world as simple stimulus-response machines. The scale of fish killing annually — measured in trillions — combined with growing evidence of fish sentience creates one of the largest welfare problems in the world.

What You Can Do

Reduce fish consumption to decrease demand for fishing at this scale
Choose sustainably certified seafood from low-bycatch fisheries
Support fish cognition research funding
Advocate for fish inclusion in all animal welfare legislation
Donate to Aquatic Life Institute and Fish Welfare Initiative programs