For the first time, Norway's salmon farmers report their ground rent tax. The figures are surprising.

Mayoral rebellion, share price stalls, massive layoffs, coastal community uproar, demonstrations, a freeze on investment. The tug of war over the new Norwegian farmed salmon tax has been protracted and dramatic.

The tax was originally proposed at 40 percent, but after an extensive consultation, was restated at 35 percent before being officially adopted at 25 percent. This is in addition to the ordinary corporation tax of 22 percent and applies to value creation that takes place at sea.

Sea is an important keyword.