Journal of
Toxicology and Environmental Health Sciences

  • Abbreviation: J. Toxicol. Environ. Health Sci.
  • Language: English
  • ISSN: 2006-9820
  • DOI: 10.5897/JTEHS
  • Start Year: 2009
  • Published Articles: 208

Full Length Research Paper

Effects of parathion on cardiac rate, ventilatory frequency and hemolymphatic gas levels in the estuarine crab Neohelice granulata (Decapoda, Brachyura)

Daniel A. Medesani1, Claudio O. Cervino2, Martín Ansaldo3 and Enrique M. Rodríguez1*
Department of Biodiversity and Experimental Biology, FCEyN, Pab. II, University of Buenos Aires, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina.
Email: [email protected]

  •  Accepted: 14 February 2011
  •  Published: 31 March 2011


Adult crabs Neohelice granulata were exposed for 96 h to 0.125 mg/L of parathion under complete submersion. Crabs were then exposed to air for 6 h (emersion period) to be finally re-submerged. Cardiac rate and ventilatory frequency, as well as hemolymphatic pH, pCO2 and pO2 were measured at different times throughout the experiment. Cardiac rate was significantly lower in crabs exposed to parathion, but only during the submersion periods, when cardiac activity is normally high. The insecticide could be affecting the neurological regulation of heart, avoiding the normal increase of cardiac activity. Ventilatory frequency, hemolymphatic, pH and gas parameters remained unaltered by exposure to 0.125 mg/L parathion, both under submersion and emersion.


Key words: Parathion, cardiac rate, crabs, submersion, emersion.