(The following commentary was written by Oslo stock exchange commentator Thor Chr. Jensen for IntraFish sister publication Dagens Næringsliv.)

Land-based fish farming stock Atlantic Sapphire plunged more than 18 percent on Tuesday after the company issued a negative profit warning. The stock is now down more than 30 percent so far this year, and the company is priced at NOK 1.38 billion ($134 million/€122 million).