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Monthly total number of farm fish, farm-source adult female sea lice, and sea lice treatments (n = 0–5 per mo; axis from top of figure not shown) in the Broughton Archipelago. L. salmonis numbers during the time of greatest concern (March and April) are highlighted in yellow. Error bars for L. salmonis estimates before 2003 denote the range of uncertainty during this period, when lice were not counted on every farm.
