For the second time in five years, a Canadian salmon aquaculture firm has admitted in a New Brunswick courtroom to illegally using a pesticide known to kill lobsters for treating salmon off an island that abuts the Maine border. According to a CBC report, Northern Harvest Sea Farms admitted Tuesday to knowingly using the pesticide Salmosan 50 WP, without getting prior approval from the province, in an attempt to combat a sea lice outbreak at a salmon farm off Head Harbour on Campobello Island.