Effect of Insecticide Containing Deltamethrin on Immune Response of the Giant Freshwater Prawn, Macrobrachium rosenbergii (De Man 1879)

Study on natural immune responses of freshwater prawn, Macrobrachium rosenbergii (De Man 1879) exposed to deltamethrin in laboratory condition was performed. Prawns (17 plus or minus 2.3 g) were maintained in water containing concentrations of deltamethrin at 0.0025; 0.025 and 0.125 mg times L super(-1). Prawns in control group were maintained in water without deltamethrin. Haemolymph samples from prawns in all groups were collected at 0, 24, 48, 72 and 96 h after exposure to deltamethrin. Haemolymph analyses carried out include total haemocyte count and identification, phenoloxidase, respiratory burst and superoxide dismutase activities. Results of immunological analyses revealed that total haemocyte count, granular cells, hyaline cells and phenoloxydase activity decreased significantly (P