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Authors
Affiliations
1 Department of Zoology, Bhavan’s College, Andheri (W), Mumbai-400 058, Maharashtra, IN
2 National Institute of Oceanography, Regional Centre, Samarth Nagar, Andheri (W), Mumbai-400 058, Maharashtra, IN
Source
Nature Environment and Pollution Technology, Vol 7, No 2 (2008), Pagination: 303-306
Abstract
Knowledge of acute toxicity of a pollutant can be used in predicting and preventing the possible damage to organisms, which help in regulating toxic waste discharges into the waters in which they live. Toxicity tests were carried out on the fish Therapon jarbua, the common species found along the near shore waters of Mumbai. Toxicity of Cu, Zn and mixtures of Cu and Zn at 22 ± 2 ‰ and 32 ± 2 ‰ salinities were studied. The response of the fish was found to be varying very little between 24 and 48 h while at 72 and 96 h the difference was appreciable. It was evident from the experiments that salinity plays a significant role in the toxicity of metals to estuarine and marine organisms. The LC50 values of Cu were found to be 2-3 times less toxic in 22 ± 2 ‰ salinity than that observed at 32 ± 2‰. The LC50 values of Zn were 1.1-1.7 times less in lower salinity than that observed at higher salinity.
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