A huge marlin caught off the coast of Northland last week has been captured in a video that's now been viewed nearly 4000 times.

A.J. Heijns captured the group loading the massive marlin - weighing nearly 350kg that took about three hours to catch - into a van.

The video prompted angry responses from people on Heijns' Facebook page - one of whom knew the group.

"I come from a fishing family and have a marine degree but I still agree it's not worth keeping," the person said.

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"Protection of reproductively viable adults is crucial for the conservation and protection of the fisheries and species."