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Concern Over the Environmental Impact of Sea Lice Agents

22 January 2013, at 12:00am

NORWAY - Concern is rising over the use of diflu and teflubenzuron as sea lice agents and the environmental consequences it may be having.

These substances prevent the formation of chitin and so when used on lice, it leads to the death of the parasite upon first moulting after treatment.

Tests that have been made by various research institutions show that these substances may be present in sea floor sediment for prolonged time. The active substances can be detected in high concentrations more than seven months after a single treatment of farmed fish.

The Fisheries Directorate will consider measures to limit the use, focusing on how repeated or heavy use can be avoided.

The Directorate will also strengthen the monitoring of such environmental effects and will therefore propose to the Ministry of Fisheries and Coastal Affairs that it require collection of samples from localities that have treated fish, particularly where there is a risk of accumulation of drugs and chemicals.

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The Health and Welfare of Atlantic Salmon.

It is vital that fish farm operatives who are responsible for farmed fish are trained in their health and welfare. This will help to ensure that fish are free from disease and suffering whilst at the same time promote good productivity and comply with legislation.

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