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Mean number of motile L. salmonis sea lice per fish on farms that were treated after odd-year pink salmon runs (triangles) and even-year pink salmon runs (inverted triangles) and the total number of sea lice treatments (Tx; open circles) per year (September 1 to August 31). The treatment threshold (number of motile L. salmonis per fish; dashed line) for March through June was established by the British Columbia provincial government in 2004.
