AN ESTIMATED 700,000 farmed salmon in Maine have been killed since March this year in a bid to control the spread of a deadly fish virus, infectious salmon anaemia (ISA). It is the first time that the disease has been discovered in US salmon farms although it has already affected both the European and Canadian fisheries. ISA is both highly contagious and incurable in fish.

In the past week, three new cases of ISA have been discovered in fish pens in Cobscook Bay near the Maine-Canada border. A 90-day quarantine was imposed by the Maine ...

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