Exotic Nuisance By: Robin Clarke. Dreissena polymorpha Zebra Mussel.

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Presentation transcript:

Exotic Nuisance By: Robin Clarke

Dreissena polymorpha Zebra Mussel

Possible methods of arrival Ballast water of ships Attachment to anchors and rope coils

Biological Effects Intense filter feeders plankton toxic material Grow in dense clusters

Commercial Effects Water Clarity Commercial Fishermen and clammers Clog pipes

Recreational Effects Boats, boat dock, and boat hulls Remains of zebra mussels Decrease in fish

Methods being used to control zebra mussels 1.Chemical molluscicides: Oxidizing (chlorine, chlorine dioxide) and Non-oxidizing 2.Manual removal (pigging, high pressure wash) 3.Dewatering / Desiccation (freezing, heated air) 4.Thermal (steam injection, hot water >32°C) 5.Acoustical vibration 6.Electrical current 7.Filters, Screens

1.Coatings: Toxic (copper, zinc) and Non-toxic (silicone-based) 2.Toxic constructed piping (copper, brass, galvanized metals) 3.Carbon dioxide injection 4.Ultraviolet light 5.Anoxia / Hypoxia 6.Flushing

Zebra Mussels. Dreissena polymorpha