Grub Control Methods

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 bird ingest infected fish and develop adult flukes, eggs released from adult flukes in bird, eggs hatch into mericidia and infect snails, cercaria exit snails and infect fish, and the process repeats itself.One method to control grub infections is to disrupt the life cycle of the snail, accomplished by eliminating one or more of the grubs’ host species, i.e., the bird or snail.


However, bird control is very problematic because the major hosts are often federally protected migratory species. There are a variety of methods used to control bird populations on farms including the use of pyrotechnics, human effigies that inflate and deflate, and reflective objects. Unfortunately, birds quickly become acclimated to these types of devices and control is only temporary.


Bird exclusion devices such as wire, electric fences, and netting have also been used. Additional control methods used with the aforementioned include border collies, limited killing of migratory birds with a depredation permit, complete screened-in enclosures, manipulating pond shape, or stocking larger fish into ponds. Nevertheless, none of these methods used alone is cost effective. Moreover, the use of any of these methods does not prevent bird hosts from flying or roosting over the ponds.


Another method to control the grubs is a therapeutic treatment to either prevent the grubs from penetrating the fish or to eliminate grubs that have penetrated the flesh. To date, there is no Food and Drug Administration (FDA) approved method for treating grubs once they are imbedded in the tissue of the fish. Therefore, the best way to control infestations is to control or limit the snail populations in ponds.


Snail Management in Culture Ponds.pdf


Review of Snail control in fish ponds-2015.pdf


Texas A&M University Extension Factsheet on Grubs: http://fisheries.tamu.edu/files/2013/09/My-fish-have-grubs-final.pdf

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