Authors : S. R. Verma
Page Nos : 154-157
Description :
Ceriodaphnia dubia is an excellent organism for toxicity testing. It belongs to crustaceans class and cladoceran order. C. dubia is ubiquitous in temperate waters and is a primary consumer, representing the bridge in the food web between photosynthetic organisms and higher species (i.e. fish).C. dubia required for the toxicity evaluation studies were collected from a local freshwater lake and cultured in Zooplankton media. Within 8–10 days time, large number of C. dubia species of uniform size was obtained for experimental purpose.The serial dilutions of heavy metals i.e. Cr6+ (0.01 to 1.5 mg/L) and Pb2+ (0.2 to 1.5 mg/L) were used in bioassay test.Results obtained from the above studies indicate that the major heavy metals are highly toxic to Ceriodaphnia. The order of reducing toxicity of heavy metals can be arranged as follows.
Cr6+>Pb2+
