title: Acute toxicity of permethrin to four size classes of red swamp crayfish (Procambarus clarkii) and observations of post-exposure effects.
abstract: The mean static acute 96-h LC50 of permethrin [(3-phenoxybenzyl (+) cis, trans, 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane carboxylate)] to red swamp crayfish (Procambarus clarkii) 8-12 mm (0.017 g), 25-35 mm (0.64 g), 45-55 mm (2.45 g), and 65-75 mm total length (8.98 g) was 0.44, 0.85, 1.30, and 0.81 micrograms/L, respectively. Permethrin toxicity did not differ among immature or mature male and female P. clarkii. Crayfish surviving permethrin exposures exhibited no differences in post-exposure growth, survival, onset of sexual maturity, or the reproduction of viable young when compared to non-exposed controls. Teratogenesis was not observed in third-instar crayfish produced from permethrin-exposed parents.
authors.affiliation: School of Forestry, Wildlife, and Fisheries, Louisiana State University Agricultural Center, Baton Rouge 70803.
authors.forename: H H
authors.initials: HH
authors.lastname: Jarboe
authors.forename: R P
authors.initials: RP
authors.lastname: Romaire
mesh_terms: D000818:Animals; D003400:Astacoidea / Q000187:drug effects*; D004553:Electric Conductivity; D005260:Female; D006863:Hydrogen-Ion Concentration; D007306:Insecticides; D008297:Male; D010100:Oxygen / Q000032:analysis; D026023:Permethrin; D011722:Pyrethrins / Q000633:toxicity*; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D007306:Insecticides; D011722:Pyrethrins; D014874:Water Pollutants, Chemical; D026023:Permethrin; D010100:Oxygen