Aquatic Animals

Farmed Salmon and Sea Lice Biology

Understanding sea louse biology enables more targeted and welfare-positive management strategies in salmon aquaculture operations.

Key Facts

Lepeophtheirus salmonis is the primary sea lice species affecting Atlantic salmon
Lice reproduce rapidly in warmer water with generations produced every 5-8 weeks
Female lice carry egg strings containing hundreds of developing larvae
Treatment resistance has developed in lice populations to chemical treatments
Louse population dynamics are affected by current patterns and farm siting decisions

Welfare Considerations

Understanding lice biology enables intervention at the most effective life stages with the lowest welfare cost. Treating before adult lice populations establish prevents the tissue damage caused by heavy infestations. Water temperature monitoring enabling prediction of reproduction rates allows proactive management. Farm siting decisions that minimise connectivity to lice sources reduce endemic louse pressure on fish welfare.

What You Can Do

Support aquaculture regulation requiring farm siting assessment for lice exposure
Choose salmon from farms with documented predictive lice monitoring systems
Advocate for research funding into sea lice biology and novel control methods
Support mandatory lice level reporting enabling public monitoring of farm welfare
Learn about sea lice biology to better understand aquaculture welfare challenges