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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The presence of hydrilla in Lake Pinehurst has been confirmed by the aquatic weed control program within the N. C. Division of Water Resources (NCDWR) and by four state-licensed aquatic contractors who bid on the Lake Pinehurst restoration contract...
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A Ministry for Primary Industries-funded trial has shown that grass carp (a weed eating fish) in enclosures could be used to eradicate early infestations of aquatic weeds, doing away with the need to release large numbers of fish throughout a lake, and preventing damage to other plant species in the water.
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The Lake Gaston Weed Control Council recently considered recommendations from its Technical Advisory Group (TAG) and Stakeholders Board regarding grass carp stocking and other matters.
TAG chairman Rob Richardson, an associate professor and extension specialist at N.C. State University with a focus on aquatic and non-cropland weeds, said that TAG over a conference call unanimously approved recommending 18 grass carp per acre be stocked this year, which would amount to 7,461 fish.
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MONCKS CORNER -- This spring, Santee Cooper is stocking lakes Marion and Moultrie with 109,000 sterile grass carp in a renewed strike against hydrilla.
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