An enormous bluefin tuna has been caught in a pen owned by salmon producer Seloy Sjofarm located in Heroy municipality in northern Norway.

Managing Director Jan Erik Jakobsen described the shock of the discovery by a team who were feeding the salmon on Tuesday.

It was 3 pm and already getting dark.

"We sent back the location boats, got hold of a processing vessel and a workboat, then it was just a matter of locating the tear," said the executive in a video shared on the company's Facebook page.