Cadmium chloride is one of the highly toxic compounds among the heavy metals. It exerts a negative impact on the living organisms and accumulates in food chain and could lead to some serious problems, such as high rate of mortality, lower longevity, decreased fecundity and lower hatching ability of many insects and other arthropods. The present work dealt with the evaluation of cadmium chloride because there is lack of published entomotoxicological reports for cadmium chloride have evaluated their effect on the growth and development of this forensically important fly blow fly species, Chrysomya megacephala (Diptera: Calliphoridae). Larvae of Chrysomya megacephala (Diptera: Calliphoridae) reared on rat tissues that were previously exposed to Cadmium chloride (CdCl2) in different concentrations: Half lethal (3.25mg/kg bw), Lethal (6.5 mg/ kg bw) and Twice Lethal (13 mg/kg bw) by intraperitoneal injection (i.p.). Development rate, larval body length, width, weight, pupal and adult weight and mortality were the observed parameters. Results demonstrated that the development rate of larvae between treated group and control group varied significantly. Development took longer time in the presence of high Cadmium concentration compared to control. Mortality results indicated greater mortality among the larvae with increased cadmium concentration as compared to control. It can be concluded that Cadmium chloride has negative effect on all the life stages of Chrysomya megacephala. Since cadmium chloride alters the rate of development in Chrysomya megacephala. There are chances of miscalculation of PMI if the presence of cadmium chloride is not taken into consideration. For example there could be wrong estimation of PMI by up to 18-86 hours if age of larvae is determined on the basis of its length ignoring the effect of cadmium chloride.

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The present study deals with the analysis of length weight relationship of Hypophthalmichthys molitrix (Val.