Wrasse Cleaner Fish Welfare in Salmon Farming

Ballan wrasse and lumpsucker wrasse are used as biological sea lice control in salmon farms. Their welfare is increasingly recognised as a significant concern — mortality rates are high and housing conditions are often inadequate.

Key Facts

Approximately 50 million wrasse and lumpsucker deployed annually in Norwegian and Scottish salmon farms
Annual mortality of wrasse in salmon farms estimated at 70-90% — extremely high
Wrasse are wild-caught from coastal waters in UK — depletion of local populations a concern
Lumpsucker bred in hatcheries — welfare requirements during captive rearing poorly understood
Wrasse are fish with their own capacity for stress and pain — their welfare is legally relevant

Welfare Considerations

Cleaner fish welfare in salmon farming has been described as a welfare crisis within a welfare solution. Wrasse and lumpsucker placed in salmon cages to eat sea lice face multiple welfare challenges: aggression from salmon, inadequate shelter, incorrect water temperatures (wrasse are warm-water fish deployed in cold Scottish waters), disease exposure and starvation when lice loads are low. Annual mortality rates of 70-90% represent welfare failure on a massive scale. ASC and RSPCA Assured standards now include cleaner fish welfare requirements, but implementation lags behind the problem. Salmon farmers face a genuine dilemma — sea lice cause salmon welfare harm, but the biological solution creates cleaner fish welfare harm.

What You Can Do

Choose salmon certified to RSPCA Assured standards with cleaner fish welfare requirements
Support Fish Welfare Initiative research into cleaner fish welfare improvement
Donate to research on alternatives to live cleaner fish (e.g. laser systems, snorkel barriers)
Advocate for cleaner fish welfare standards in salmon certification programmes
Reduce Atlantic salmon consumption pending improvement in welfare standards across the supply chain