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The half-lives of biological activity of some pesticides in water

Author

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  • Kyaw, M.O.

Abstract

In the absence of analytical methods, the half-lives of biological activity of pesticides can be estimated by bioassays. To determine the half-lives of biological acivity of pesticides to fish, static bioassays were conducted in the laboratory with ten different formulations of pesticides using Labeo rohita as a bio-indicator. The half-lives of biological activity for ten different pesticides in soft water at pH 7.5 and 27░C, ranged from 4.6 days to 11.8 days. The half-life of biological activity of Sumithion 50% EC was only 4.6 days. In contrast, Dimecron 50% EC degraded very slowly and its half-life of biological activity on L. rohita was about 11.8 days. Sumithion 50% EC, Padan 50% SP, EPN 45% EC, Diazinon 40% EC and Diazinon 10 G degraded in less than five to seven days indicating that these pesticides are desirable for rice-fish culture. Contamination by pesticides with long-term residual toxicity in waters may eventually cause high levels of fish mortality.

Suggested Citation

  • Kyaw, M.O., 2001. "The half-lives of biological activity of some pesticides in water," Naga, The WorldFish Center, vol. 24(3-4), pages 11-13.
  • Handle: RePEc:wfi:wfnaga:35549
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    File URL: http://pubs.iclarm.net/Naga/Naga24-3&4/pdf/aquabyte%201.pdf
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    More about this item

    Keywords

    Pesticides; Bioassays; Rice field aquaculture; Water Labeo rohita;
    All these keywords.

    JEL classification:

    • Q00 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - General - - - General

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