The effectiveness of piperonyl butoxide (PB) in reducing the mortality of striped prawn and kuruma prawn during exposure to fenitrothion (FS) was examined. The 24-h LC50 values of PB for striped and kuruma prawns were 3.5 and 1.6 ppm at 25°C, respectively. Therefore, PB-treatment for both prawns was conducted at 0.25 ppm, corresponding to one-tenth of the mean of both 24-h LC50 values. The PB-pretreatment before FS-exposure and also the addition of PB to FS-water were effective in decreasing the FS-toxicity to both prawns. The most effective reduction of the toxicity to the prawns was obtained by continuous PB-treatment before and during FS-exposure, resulting in extensions of 50% survival time by 4–6 times in striped prawn and 10–16 times in kuruma prawn, compared with the respective control groups non-treated with PB.
All Science Journal Classification (ASJC) codes
- Aquatic Science