Toxicity of copper to three estuarine bivalves |
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| Authors: | A K Kumaraguru K Ramamoorthi |
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| Institution: | Centre of Advanced Study in Marine Biology, Porto Novo 608 502, India |
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| Abstract: | This paper reports on a study of the toxicity of copper to three species of bivalve of commercial food value, Anadara granosa (Linnaeus), Meretrix casta, Deshayes and Crassostrea madrasensis (Preston) inhibiting the Vellar estuary at Porto Novo (southern India). The LC50 values were estimated as 60 μg Cu/litre for A. granosa, 72 μg Cu/litre for M. casta and 88 μg Cu/litre for C. madrasensis subjected to 96-h static bioassay tests after acclimation for a period of four days in the laboratory. The animals selected for study ranged in length from 29 to 44 mm in A. granosa, from 25 to 42 mm in M. casta and from 31 to 115 mm in C. madrasensis. The experiments were conducted at 25% salinity with pH 8·0 ± 0·1 at a temperature of 27°C ± 0·5°C. The revival rates of bivalves which survived exposure to the LC50 concentrations for the 96-h period (when marked and released in the natural environment) were 67% for A. granosa, and C. madrasensis and 83% for M. casta. The LT50 values for the three bivalves at different concentrations of the metal were also calculated. |
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