Abstract
Objective: To determine the acute toxicity of trichlorophon (an organ phosphorus compound used in agricultural fields and a common disinfectant used for fish diseases) towards two ornamental fish Systomus tetrazona and Hemigrammus erythrozonus. Methods: In this research, two aquarium fish were exposed to different concentrations of trichlorophon (5, 10, 20 and 40 mg/L) for 96 h and physicochemical properties of water used for these experiments were stable and every mortality was recorded daily for 96 h. LC50 of 24 h, 48 h, 72 h and 96 h were attained by probit analysis software SPSS version 16. Results: The 96-h LC50 of trichlorophon for Systomus tetrazona and Hemigrammus erythrozonus were 8.74 and 8.88 mg/L, respectively. Conclusions: Eventually, toxicity values indicated that trichlorophon has the same toxicity towards the studied species and the lower value of LC50 for studied species in comparison with that of most species can be stated. journal homepage: www.jclmm.com
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