Acute Toxicity and Behavioral Changes Associated with Diazinon in Rutilus rutilus caspicus and Hypophthalmicthys molitrix

Authors

  • Hamed Ghafari Farsani MD, Young Researchers and Elite Club, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran.
  • Mohammad Hasan Gerami PhD Candidate, Young Researchers and Elite Club, Shiraz Branch, Islamic Azad University, Shiraz, Iran.
  • Saeid Shahbazi Naserabad MD, Young Researchers and Elite Club, Yasuj Branch, Islamic Azad University, Yasuj, Iran.
  • Seyed Ali Akbar Hedayati Department of Fisheries, Gorgan University of Agricultural and Natural Resources, Gorgan, Iran.
Abstract:

Background: Diazinon is an organophosphorous pesticide which widely found in municipal, agricultural, and urban storm water discharges. The present study was conducted to achieve lethal concentration (LC50) and behavioral changes of Rutilus rutilus caspius and Hypophthal-micthys molitrix after exposure to lethal concentration of diazinon. Methods: The experiment was carried out in static conditions, based on instructions of OECD in 4 days under controlled water physicochemical conditions with pH of 7.2±0.2, oxygen of 7±0.3 mg/l, total hardness of 180 mg CaCo3 and temperature of 24±1 C°. All fishes were accli-matized in 400 L aquaria for 10 days. Treated aquaria had concentrations of 0.5, 1, 2, 4, 8, 10, 20, 40, 60, and 80 ppm of diazinon for H. molitrix, and 1, 2, 4, 8, 10, and 20 for R. rutilus caspi-cus, while there was no toxic concentration for the control group. LC1, LC10, LC30, LC50, LC70, LC90, and LC99 were calculated for 24, 48, 72, and 96 hours. Results: LC50 96h diazinon values were 3.93 and 1.71 ppm for H. molitrix and R. rutilus caspi-cus, respectively. Clinical observation revealed that the poisoned fishes suffered from nerve paralysis syndrome. The fishes exhibited irregular, erratic, and darting swimming movements, severe aching, and collapse to the bottom of the aquarium. Conclusion: These findings suggest that diazinon has medium toxicity at low concentrations for thede two species and causes morbidities.

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Journal title

volume 9  issue None

pages  1354- 1359

publication date 2015-05

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