Document Detail

Pulse-exposure effects of selected insecticides to juvenile Australian crimson-spotted rainbowfish (Melanotaenia duboulayi).
MedLine Citation:
PMID:  12020003     Owner:  NLM     Status:  MEDLINE    
Laboratory toxicity studies were conducted in southeastern Queensland, Australia, to determine the acute lethal effects of a 1-h pulse exposure of selected insecticides to adult and juvenile (<72 h old) crimson-spotted rainbowfish, Melanotaenia duboulayi (Castlenau). In addition, to its ecological significance, this native fish is a predator of mosquitoes. Two organophosphate (OP) compounds (temephos and pirimiphos-methyl), an entomophathogenic bacterium (Bacillus thuringiensis variety israelensis [Bti]) and two insect growth regulators (IGRs) (s-methoprene and pyriproxyfen) were evaluated. Although none of the five insecticides were acutely toxic to adult M. duboulayi under the test conditions, temephos and pirimiphos-methyl were found to be toxic to juveniles, with 24 h pulse exposure LC50 values of 27 and 15 microg/liter (ppb), respectively. Of the two OPs, pirimiphos-methyl was the most toxic, with a lethal dose ratio (pulse exposure LC50 temephos/ pulse exposure LC50 pirimiphos-methyl) of 1.8 (95% CL 0.5-6.4). These pulse exposure LC50 values represented 40 and 4.5% of the estimated environmental concentrations (EEC) for a 15 cm deep water body, respectively. Bti and the two IGRs had no acute toxic effects at up to 10 and 12.5 times the EEC, respectively. Accordingly, in the interests of environmental conservation and integrated pest management (IPM), preference should be given to the latter three insecticides for control of mosquito larvae in juvenile M. duboulayi habitat.
M D Brown; J Carter; D Thomas; D M Purdie; B H Kay
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of economic entomology     Volume:  95     ISSN:  0022-0493     ISO Abbreviation:  J. Econ. Entomol.     Publication Date:  2002 Apr 
Date Detail:
Created Date:  2002-05-21     Completed Date:  2002-07-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  2985127R     Medline TA:  J Econ Entomol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  294-8     Citation Subset:  IM    
Queensland Institute of Medical Research and University of Queensland Tropical Health Program, Royal Brisbane Hospital, Australia.
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MeSH Terms
Bacillus thuringiensis*
Insecticides / pharmacology*,  toxicity
Juvenile Hormones / pharmacology*,  toxicity
Methoprene / pharmacology*,  toxicity
Organothiophosphorus Compounds / pharmacology*,  toxicity
Pyridines / pharmacology*,  toxicity
Temefos / pharmacology*,  toxicity
Reg. No./Substance:
0/Insecticides; 0/Juvenile Hormones; 0/Organothiophosphorus Compounds; 0/Pyridines; 29232-93-7/pirimiphos methyl; 3383-96-8/Temefos; 40596-69-8/Methoprene; 95737-68-1/pyriproxyfen

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