Last month 32,887 metric tons of farmed salmon production capacity was put up for sale, but only 75 percent of it was bought, leaving 8,243 metric tons unsold and unused in a market enjoying high demand and high prices.

Norway employs a traffic light system to rank and sell its maximum permitted biomass for salmon farms.

In this year's auction, only production allowances in green areas -- where the least wild salmon are estimated to die as a result of sea lice from salmon farms -- was sold, with news of a