Kyaw Myint Oo, (2001) The half-lives of biological activity of some pesticides in water. Naga, the ICLARM Quarterly, 24(3-4), pp. 11-13.
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.
|Item Type: ||Article|
|Title: ||The half-lives of biological activity of some pesticides in water|
|Personal Creator/Author: |
|Kyaw Myint Oo,|
|Journal or Publication Title: ||Naga, the ICLARM Quarterly|
|Page Range: ||pp. 11-13|
|Issuing Agency: ||WorldFish Center|
|Uncontrolled Keywords: ||Pesticides; Bioassays; Rice field aquaculture; Water; Labeo rohita|
|Item ID: ||9300|
|Depositing User: ||Mr William Ko|
|Date Deposited: ||30 Nov 2012 13:38|
|Last Modified: ||30 Nov 2012 13:45|
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