Plentiful fish stocks aren't usually a problem, but in the central North Island a plague of catfish is causing a headache for local environmentalists.
The invasive species was first discovered in Lake Rotoiti in the Bay of Plenty three years ago.
Female catfish can carry up to 6000 eggs at a time, meaning the population has since boomed.
Seven Sharp's Tamati Rimene-Sproat investigates those on the frontline trying to stop the invasion in the video above.
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