Description
Over the past decade, the Asian freshwater bivalvemollusk Limnoperna fortunei has invaded SouthAmerican waters, where its fouling has made it amajor nuisance for industrial and power plants, as wellas the drinking water industry. Given the rising trendin worldwide shipping traffic, a future North Americaninvasion by the pest mussel organism is probable.Because of L. fortunei’s economic threat, adequatecontrol measures must be developed.This investigation examined L. fortunei’s susceptibilityto chlorine and three nonoxidizing molluscicidesproven to be effective in controlling the zebra musselDreissena polymorpha. In general terms, two of themolluscicides were either ineffective or marginallyeffective at the concentrations recommended for thezebra mussel, especially at lower temperatures. Thethird molluscicide was the most toxic of thecompounds tested; concentrations of >/=1 mg/L yielded>50% mortalities at all temperatures. At 15 and 20 degrees C,chlorine at 5 mg/L resulted in total kills after three tosix weeks of exposure. At 25 degrees C, it was effective at allconcentrations (1-100 mg/L), achieving 100% mortalitiesin 11-17 days. Temperature substantially enhancedthe toxicity of all the chemicals tested, particularlychlorine.The authors concluded that the commercial formulationswidely used to control the North Americaninvading pest D. polymorpha are ineffective for L.fortunei. Furthermore, in contrast to Dreissena, whichspawns over a two- to three-month period,Limnoperna has a long period of active reproduction,a fact that will further complicate its control. Thesefindings indicate that direct extrapolation from theample experience gained in dealing with the zebramussel will be of limited value in meeting the challengeof L. fortunei. Includes 55 references, tables, figures.
Product Details
- Edition:
- Vol. 95 – No. 1
- Published:
- 01/01/2003
- Number of Pages:
- 13
- File Size:
- 1 file , 330 KB
- Note:
- This product is unavailable in Ukraine, Russia, Belarus
