The acute and chronic effects of endosulfan pulse-exposure on Jordanella floridae (Florida flagfish) over one complete life-cycle.
Endosulfan is an organochlorine pesticide, which is used worldwide and has known toxic effects on non-target organisms including fish. This research investigated the acute and chronic effects of pulse-exposed endosulfan on Florida flagfish (Jordanella floridae). A 4-h pulse-exposure of endosulfan to larval flagfish caused a significant increase in mortality after 96 h at nominal concentrations equal to or greater than 100 μg/L. Some of the acute sub-lethal observations included hyperactivity, convulsions, and axis malformation. Seven-eight day old post-hatch flagfish were pulse-exposed for 4h to endosulfan and then monitored over one full life-cycle for chronic effects on growth, reproduction, and survivability. There were no growth or reproductive effects of endosulfan pulse-exposure up to the highest exposure concentration of 10.8 μg/L. Thus, the life-cycle 4-h pulse-exposure no observed effect concentration (NOEC) and lowest observed effect concentration (LOEC) were 3.3 and 10.8 μg/L endosulfan, respectively, based on significantly higher larval and juvenile mortality.
Faculty of Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa Ontario, Canada L1H 7K4. Lindsay.Beyger@uoit.ca
Lindsay
L
Beyger
Rodrigo
R
Orrego
John
J
Guchardi
Douglas
D
Holdway
D000818:Animals; D004305:Dose-Response Relationship, Drug; D004726:Endosulfan / Q000008:administration & dosage / Q000633:toxicity*; D005260:Female; D005399:Fishes / Q000254:growth & development / Q000502:physiology; D005431:Florida; D007306:Insecticides / Q000008:administration & dosage / Q000633:toxicity*; D007814:Larva / Q000187:drug effects / Q000254:growth & development; D008018:Life Cycle Stages; D008297:Male; D012098:Reproduction / Q000187:drug effects; D014874:Water Pollutants, Chemical / Q000008:administration & dosage / Q000633:toxicity*
D007306:Insecticides; D014874:Water Pollutants, Chemical; D004726:Endosulfan