Previous studies indicate the high toxicity of
deltamethrin to fish species and our results are in good
agreement with these reports. Boateng et al. [23]
reported that young fish are more susceptible and
different species respond unlike to concentrations of
chemicals: Mittal et al. [24] estimated deltamethrin toxicity
to P. reticulate to be LC50=0.016 ppm. Viran et al. [10]
reported LC50 value of deltamethrin in guppies as 5.13
mg/l. Mestres and Mestres [25] found 96-h fish LC50
values as follows: Salmo gairdneri, 0.39 mg/l; Cyprinus
carpio, 1.84 mg/l; and Sarotherodon mossambica, 3.50
mg/l. LC50 value of deltamethrin in Tilapia, Oreochromis
niloticus as15.47 μg/l was reported by Boateng et al. [23].