All 15 snapper trawlers operating in New Zealand's most lucrative fishery now have video cameras installed to make sure they are not dumping fish.
The fishing vessels in snapper one fishery (SN1), off the east coast of the North Island, adopted the technology after a trial by Sanford Fisheries.
Monitoring systems also detect whether vessels are catching undersize fish, and send information to the Ministry for Primary Industries (MPI) about where and how fish are caught.
Primary Industries Minister Nathan Guy said increased monitoring led to greater transparency about commercial fisheries' activities.