Abstract
Complex effluents originating from diverse industrial processes in industrial zones could pose cytotoxic/genotoxic hazards to biota in the receiving ecosystems which cannot be revealed by conventional monitoring methods. This study assessed potential cytotoxicity/genotoxicity of treated effluents of two industrial zones which are discharged into Kelani river, Sri Lanka combining erythrocytic abnormality tests and comet assay of the tropical model fish, Nile tilapia. Exposure of fish to the effluents induced erythrocytic DNA damage and deformed erythrocytes with serrated membranes, vacuolations, nuclear buds and micronuclei showing cytotoxic/genotoxic hazards in all cases. Occasional exceedance of industrial effluent discharge regulatory limits was noted for color and lead which may have contributed to the observed cytotoxicity/genotoxicity of effluents. The results demonstrate that fish erythrocytic responses could be used as effective bioanalytical tools for cytotoxic/genotoxic hazard assessments of complex effluents of industrial zones for optimization of the waste treatment process in order to reduce biological impacts.
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Acknowledgements
This research was funded by the National Research Council (Research Grant: 11-11) and National Science Foundation (Equipment Grant: RG/2011/EQ/16) of Sri Lanka.
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All applicable international guidelines for the care and use of animals were followed in relation to the laboratory maintenance and bioassessment with the fish.
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Hemachandra, C.K., Pathiratne, A. Bioassessment of the Effluents Discharged from Two Export Oriented Industrial Zones Located in Kelani River Basin, Sri Lanka Using Erythrocytic Responses of the Fish, Nile Tilapia (Oreochromis niloticus). Bull Environ Contam Toxicol 99, 481–487 (2017). https://doi.org/10.1007/s00128-017-2156-9
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DOI: https://doi.org/10.1007/s00128-017-2156-9