A Ministry for Primary Industries trial has found grass carp kept in enclosures are effective in eliminating early infestations of aquatic weeds.
As part of the trial, six 2.5 metre by six metre cages were placed in beds of hornwort weed in Lake Karapiro.
Within nine weeks, the three to five fish contained in each cage had removed the weed.
MPI senior adviser Andrew Bell says once the hornwort was eradicated, the fish and the enclosures were removed safely.
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