Proximar Seafood, the Per Grieg Jr. backed land-based salmon group, debuted on the Oslo Stock Exchange's Euronext Growth Wednesday, becoming the fifth company of its sort to go public.

Proximar's share price rocketed 20.3 percent as markets opened Wednesday to NOK 19.49 (€1.88/$2.27).

The company successfully raised NOK 400 million (€38.8 million/$47.2 million) on Jan. 25 in a share offering that was 10 times oversubscribed.