The Norwegian government's proposed 40 percent tax on the country's salmon farmers has thrown the global salmon supply chain into disarray.

Normally at this time of year, retail, foodservice and distribution buyers in the United States and elsewhere are negotiating next year's supply contracts -- and prices -- with Norwegian and other salmon suppliers.

But the uncertainty resulting from the government's unexpected tax hike proposal is preventing salmon farming companies from entering into long-term sales contracts with customers because the tax will be based on the spot market price, which fluctuates week to week and doesn't necessarily reflect the price at which a company eventually sells it salmon.