期刊
MARINE ENVIRONMENTAL RESEARCH
卷 101, 期 -, 页码 145-152出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marenvres.2014.09.011
关键词
Zooplankton; Pulse exposure; Deltamethrin; Cypermethrin; Azamethiphos; Hydrogen peroxide; Aquaculture; Ecotoxicology
资金
- NSERC Canadian Integrated Multi-Trophic Aquaculture Network (NETGP) [372815-08]
- Program for Aquaculture Regulatory Research, Department of Fisheries and Oceans
Anti-sea lice pesticides used in salmon aquaculture are released directly into the environment where non-target organisms, including zooplankton, may be exposed. The toxicity of four pesticides to field-collected copepods was examined in 1-h exposures with lethality and feeding endpoints determined 5-h post-exposure using staining techniques. Copepods were immobilized within 1 h, at aquaculture treatment concentrations of deltamethrin (AlphaMae (R)), cypermethrin (Excis (R)), and hydrogen peroxide (Interox (R) Paramove (TM) 50). All organisms showed vital staining, indicating immobilized organisms were still alive, thus LC50s were not determined. Feeding on carmine particles was inhibited and EC50s ranged from 0.017 to 0.067 mu g deltamethrin/L, 0.098-0.36 mu g cypermethrin/L, and 2.6-10 mu g hydrogen peroxide/L, representing 30- to 117-fold, 13- to 51-fold, and 120- to 460-fold dilutions of the respective aquaculture treatments. No effects were observed in copepods exposed to azamethiphos (Salmosan (R)) at 5-times the aquaculture treatment. Acute exposure to three of the four pesticides affected feeding and mobility of copepods at environmentally-realistic concentrations. (C) 2014 Elsevier Ltd. All rights reserved.
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