Invasion of the non-indigenous nuisance mussel, Limnoperna fortunei, into water supply facilities in Japan

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The aquatic nuisance mussel, Limnoperna fortunei, arrived in Japan before 1987 possibly with the Asian clam imported as food from mainland China. Now the mussel’s distribution has spread to two river systems in central Japan.

Water authorities reported several cases of damage caused by L. fortunei. Most cases of damage were caused by dead mussels clogging small diameter pipes for raw water sampling and monitoring and for cooling water. Clogging of cooling water pipes stopped raw water pumping to a water purification plant and caused the shutdown of a turbine dynamo-electric generator in a hydraulic power plant. The attachment of L. fortunei caused the malfunction of a water level gauge. There was a heavy accumulation of dead L. fortunei in slurry treatment facilities and rotten mussels developed an offensive odour.

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