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Dead fish, most of them snapper, have washed up on Coromandel Peninsula beaches, and fisheries authorities want to know how they got there.
The rotting carcasses are littering beaches from the top of the Coromandel Peninsula for about a 10km stretch, Newstalk ZB reported.
Fisheries authorities want to hear from anyone who might have a clue as to what happened.
In similar cases in the past, prosecutions have resulted against commercial trawlers dumping their catch at sea.
Compliance manager Brendon Mikkelsen says the fish started washing up on New Year's Day.