Aquatic toxicology of cypermethrin. II. Fate and biological effects in pond experiments

摘要: Abstract Two pond studies are described which were carried out to investigate dispersion, persistence and biological effects of cypermethrin in natural waters. The first was during a period 2 wk the second 16 wk. A dosage 100 g · ha −1 , i.e. much greater than is likely contaminate fresh waters under normal conditions agricultural use, applied surface ponds. Soon after treatment concentrations associated with water emergent vegetation those subsurface benthic sediment. Downward dispersion from relatively limited. Only 8–16% subsequently found water. Fish survived but there high mortality some species aquatic insects Crustacea. Survival fish that contained apparently lethal attributed sorption onto suspended solids. Development mat filamentous algae 6 herbivorous arthropods. Ten weeks most invertebrates had recolonized treated pond.