Cleaner Fish Welfare Advanced: Wrasse and Lumpfish in Salmon Farming

Cleaner fish used in salmon farming for biological lice control have their own welfare needs that are increasingly recognized and incorporated into aquaculture welfare standards.

Key Facts

Over 60 million cleaner fish are deployed annually in Norwegian salmon farming alone
Ballan wrasse and lumpfish are the primary species, sourced from both wild capture and aquaculture
Cleaner fish suffer high mortality in salmon net pens — annual mortality rates of 50-80% are common
Welfare needs include appropriate shelter structures, species-specific diet, and temperature management
Ballan wrasse have complex social systems and cognitive abilities comparable to other wrasse species
RSPCA Assured salmon standards now include minimum cleaner fish welfare provisions

Welfare Considerations

Cleaner fish welfare was largely ignored during the rapid expansion of biological lice control in salmon farming. High mortality rates accepted as routine reflect a welfare calculus where cleaner fish were treated as disposable tools rather than animals with welfare needs. Recognition that cleaner fish are sentient vertebrates with specific behavioral and environmental requirements has driven welfare standard development. The challenge is implementing these standards while maintaining biological control efficacy — cleaner fish that are too stressed to perform louse removal provide neither welfare nor lice control benefit.

What You Can Do

Choose salmon certified by standards that include cleaner fish welfare provisions
Support research into welfare-compatible deployment strategies that reduce cleaner fish mortality
Advocate for inclusion of cleaner fish welfare in all salmon aquaculture certification standards
Contact salmon retailers asking whether their suppliers have cleaner fish welfare protocols