Norway has this month recorded the highest sea temperatures in 10 years across the vast majority of its salmon production areas, according to figures from the Norwegian Institute of Marine Research.

The average temperature during the first week of September was 15.02 deg. C.

The summer started with lower than average temperatures in June, followed by a sharp increase in July, making sea lice outbreaks more likely.

"The lice situation is a bit stressful," chairman of Bergen-based Salmon Group Tom Jarle Bjorkly told IntraFish.