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Development of an infection-risk model for sea trout and Atlantic salmon

Results from a study aimed at investigating the temporal and spatial distribution of Atlantic salmon and sea trout post-smolt in a Norwegian fjord system were used for developing a multivariate model for predicting the pattern of the salmon lice infestations on wild salmonids in different parts of the fjord. The model can be used to evaluate if observed infestation levels in fjord systems are acceptable or safe, i.e. if the infestation levels are harmful or not for wild salmonids. Furthermore, the model also enables prediction of the risks and levels of smolts being infested by salmon lice at specific sites in a fjord. Hence, the model can be used to predict effects of establishment of fish farms on new sites in fjords and coastal areas by identifying areas where the negative effects on wild salmonid populations will be minimal. Experiences gained from Norway will then assist similar managerial decisions in other regions of Europe where aquaculture is conducted.

Reported by

Norwegian Institute for Nature Research
Tungasletta 2
N-7485 Trondheim
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