Toxicity of chlorine and three nonoxidizing molluscicides to the pest mussel limnoperna fortunei
The freshwater Asiatic mussel Limnoperna fortunei invaded the Paraná-Uruguay river system in Argentina around 1990. Since then, the pest mussel has spread extensively and is now a major nuisance for many industrial and domiciliary water supply systems. This research exposed L fortunei adults to chlo...
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| Autores principales: | , , |
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_0003150X_v95_n1_p66_Cataldo |
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| Sumario: | The freshwater Asiatic mussel Limnoperna fortunei invaded the Paraná-Uruguay river system in Argentina around 1990. Since then, the pest mussel has spread extensively and is now a major nuisance for many industrial and domiciliary water supply systems. This research exposed L fortunei adults to chlorine and three nonoxidizing commercial molluscicides for varying amounts of time at concentrations between 0.25 and 100 mg/L at 15, 20, and 25°C. At 25°C, chlorine was effective at all concentrations (1-100 mg/L) yielding 100% mortalities in 11-17 days. At 15 and 20°C, only concentrations a ≥5 mg/L resulted in total kills after three to six weeks of exposure. The first molluscicide had little effect at 1 mg/L at all temperatures, but 2.5 mg/L of the molluscicide at 20 and 25°C attained 80-90% mortalities on the third day of postexposure. At 15°C, the second molluscicide failed to kill 100% of the mussels exposed at all concentrations tested. At 20°C, only doses < 10 mg/L eliminated all the mollusks, but at 25°C, all concentrations of the molluscicide down to 2.5 mg/L were 100% effective in one week or less. The third molluscicide proved to be the most toxic of the compounds tested, yielding > 50% mortalities at all temperatures at ≥ 1 mg/L At higher temperatures, toxicity was substantially enhanced for all toxicants, especially chlorine. |
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