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Control and suppression of invasive Asian Clams from Gavin’s Point National Fish Hatchery, Yankton South Dakota.

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Asian ClamBiological fouling (biodfouling) is the undesirable accumulation of organisms on underwater structures and vessels. Invasive mussels and clams are known mostly as biofoulers of electrical and nuclear power plants. However, these organisms also impact the benthic and aquatic environments where they are found by displacing native invertebrates in the substrate and sequestering nutrients necessary for other aquatic food chains.

In 2003, zebra mussels were identified below Fort Randall Dam in the Missouri River. Since that discovery the hatchery has followed strict treatment protocols to mitigate the risk of transport of zebra mussel larvae during stocking efforts. In the fall of 2009, an established population of Asian clams (Corbicula fluminea) was discovered in Lewis and Clark Lake, South Dakota, which supplies fish production water to Gavin’s Point National Fish Hatchery. Chemical applications applied to eradicate mussel larvae below the Fort Randall Dam were also applied to eradicate the juvenile stage Asian clam with less than a hundred percent effectiveness. There is limited toxicity information for adult and larval Asian clams and research at NOROCK will determine susceptibility of Asian clams to other chemical and physical methods in order to maintain current stocking efforts.