Negotiators from Norway, the European and the UK struck an agreement on Friday for harvesting shared stocks in the North Sea, with mixed news for whitefish and pelagic species.

Officials agreed to lift the total allowable catch (TAC) for herring in the North Sea sharply next year, by 20 percent to 427,628 metric tons. The quota for whiting, meanwhile, was increased by 25 percent to 26,636 metric tons.

The picture for key whitefish species, however, is more complex.