The Oslo Stock Exchange approved Monday Norwegian salmon giant Marine Harvest's mandatory offer to acquire the remaining shares in Polish processor Morpol for NOK 11.50 (€1.5/$2) per share, after it acquired 48.5 percent in December last year.

"Marine Harvest is offering the rest of Morpol's shareholders the option of selling their shares at  NOK 11.50 (€1.5/$2), as with the main shareholders," Kolbjorn Giskeodegard, analyst at Nordea Markets told IntraFish.

"This was what was expected, and the remaining shareholders have two options now -- they can go with this offer, or speculate on a higher bid," he said.