Community Research and Development Information Service - CORDIS

Comparison of infection risks in farm-exclusion zones (Romsdalsfjord) and farmed zones (Eresfjord/ Karlsøyfjord) for free-ranging sea trout

Salmon lice infestation levels in wild sea trout were investigated inside (Eresfjord) and outside (Karlsøyfjord) a salmon farming protection zone in the Romsdalsfjord system, Norway. No new salmonid farms can be established within the protection zone and the existing ones have to operate under a strict management regime. Wild sea trout sampled outside the protection zone (Karlsøyfjord) had higher prevalence and significantly higher abundance of sea lice than sea trout inside the protection zone (Eresfjord). The results indicate that wild sea trout will benefit from a farm protection zone in the fjord. However, the infestation level observed in wild sea trout inside the protection zone was higher than in completely farm free fjords in Norway. This implies that the protection zones are too small to have the necessary effect. The results are therefore highly relevant for establishing and managing new protection zones and for suggesting alternative structures of established zones. The results have been submitted for publication, and will aid authorities in an ongoing process evaluating the farming protection zones in Norway. Experiences gained from Norway will then assist similar managerial decisions in other regions of Europe where aquaculture is conducted.

Reported by

Norwegian Institute Fisheries and Aquaculture Research
University Campus Breivika
N-9291 Tromsø
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