Highlands and Islands Enterprise is to launch its own inquiry into the merger of Pan Fish with Marine ­Harvest and Fjord Seafood.
The move has been approved in Norway and the US but awaits the judgment of the OFT as to whether it will refer the move to the Competition Commission, not least because it creates an aquaculture giant controlling 65% of Scottish farmed salmon production.
In the face of consolidation, councillors are worried about the impact on the smaller independent salmon producers.
In Norwegian waters, Pan Fish will control 25% of the farmed salmon biomass.