Aquaculture Cleaner Fish Welfare

Lumpfish and wrasse are used as cleaner fish in salmon farming to remove sea lice, but their welfare needs are often neglected in an industry focused primarily on salmon production.

Key Facts

Around 50 million lumpfish and wrasse are deployed in Norwegian salmon farms annually
Cleaner fish mortality rates are extremely high - often 50-80% over a production cycle
Lumpfish and wrasse have specific habitat, temperature, and social needs largely unmet on salmon farms
The welfare of cleaner fish has received far less attention and regulatory protection than salmon
Research programs are developing welfare standards specifically for cleaner fish production and deployment

Welfare Considerations

Cleaner fish welfare represents a significant and largely invisible welfare problem in salmon aquaculture. Lumpfish and wrasse are used instrumentally to reduce sea lice, but their welfare needs are secondary to their function. High mortality rates indicate that the farm environment is not meeting their physiological needs. Lumpfish need shelter structures, appropriate temperatures, and hiding areas - needs rarely provided in sea cages optimized for salmon. The scale of cleaner fish deployment - tens of millions annually in Norway alone - means the aggregate welfare impact is substantial. Research programs are beginning to address this gap, but regulatory standards for cleaner fish welfare remain underdeveloped.

What You Can Do

Support aquaculture certification schemes that include cleaner fish welfare standards
Advocate for regulatory requirements addressing cleaner fish welfare in salmon farming regulations
Buy salmon from farms demonstrating low cleaner fish mortality and documented welfare management
Support research developing alternatives to biological lice control that eliminate cleaner fish welfare concerns
Raise awareness about cleaner fish welfare as a neglected dimension of salmon farming