title: Effects of aerial thermal fog applications of fenthion on caged pink shrimp, mysids and sheepshead minnows.
abstract: Mosquito control applications of fenthion by aerial thermal fog equipment were studied at 2 sites in Collier County, FL, for sprays that occurred on June 20 and 23, 1984. Acute, lethal effects of fenthion deposited in these estuarine habitats were assessed for caged pink shrimp (Penaeus duorarum), mysids (Mysidopsis bahia) and sheepshead minnows (Cyprinodon variegatus). At Site 1, along a bay with substantial dilution and tidal mixing, fenthion concentrations of 1.5 and 0.29 micrograms/liter were measured in samples taken immediately after both sprays. Concentrations decreased to less than or equal to 0.020 microgram/liter 12 h postspray and no mortality was observed for caged pink shrimp and mysids. Site 2 was along a residential canal system that offered limited dilution and mixing. Maximum concentrations were 2.6 and 0.51 micrograms/liter and measurable concentrations (greater than 0.038 microgram/liter) of fenthion persisted at this site for 4 days. Fenthion concentrations in surface waters were toxic to caged pink shrimp and mysids after both sprays. No mortality occurred among caged sheepshead minnows at either site.
mesh_terms: D000818:Animals; D003530:Cyprinidae; D033364:Decapoda / Q000187:drug effects*; D004463:Ecology; D005284:Fenthion / Q000009:adverse effects*; D009032:Mosquito Control; D014873:Water Pollutants / Q000009:adverse effects*; D014874:Water Pollutants, Chemical / Q000009:adverse effects*; D014887:Weather
chemical_list: D014873:Water Pollutants; D014874:Water Pollutants, Chemical; D005284:Fenthion