Britain has extended the agreement that gives Norwegian wellboats permission to operate in UK waters for a further three years.
The agreement, which applies to selected vessels, allows exemption from UK regulations.
The news was immediately welcomed by the Norwegian Ship Owners’ Association and other marine groups.
Much of Scotland’s salmon industry is Norwegian owned, which means that vessels frequently operate in both countries.
Knut Arild Hareide, head of the Ship Owners’ Association, said: “This is a very important and gratifying clarification.
“The extension ensures market access and contributes to stable operations in an (aquaculture) industry that creates great value and jobs along the entire coast."
The development came after the sector raised possible concerns with the Norwegian authorities. The agreement extension covers issues safety and operational needs.
Knut Hareide added: “This shows that close and solution-oriented dialogue between authorities and industry can yield results that benefit both countries. Now it is important to build on this foundation so that other maritime players also get the predictability they need.
“The Norwegian maritime industry is a strategic partner for the UK in energy, aquaculture, green shipping and critical maritime services. Our goal is for the entire industry to have secure and competitive access to the British market in the years to come.”
The association is the primary employers’ organisation and interest group for more than 130 Norwegian shipping and fish farming companies, representing a fleet of 1,400-1,700 ships and rigs worldwide.
Based in Oslo, it acts as both an employer association and a lobbying organisation for the maritime industry.