African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6638

Full Length Research Paper

The comparative toxicities of cadmium, copper and lead to Macrobrachium rosenbergii and Penaeus monodon postlarvae

*1Fafioye, O.O. and  2Ogunsanwo, B.M.   
1Department of Biological Sciences, Olabisi Onabanjo University, Ago-Iwoye, Ogun State, Nigeria.  2Department of Chemical Sciences, Olabisi Onabanjo University, Ago-Iwoye, Ogun State, Nigeria.   
Email: [email protected]

  •  Accepted: 30 November 2006
  •  Published: 31 January 2007

Abstract

Comparative acute toxicity tests were carried out with three heavy metals viz. cadmium, copper and 
lead on giant prawn (Macrobrachium rosenbergii) and tiger prawn (Penaeus monodon) post larvae. 
Lethal concentrations at which 50% of the shrimp died (LC50) at 96 h were 3.23 mg/l Cd, 3.02 mg/l Cu 
and 10.0 mg/l Pb for M. rosenbergii; 2.91 mg/l Cd, 2.16 mg/l Cu and 7.28 mg/l Pb for P. monodon. The 
metals showed toxicities in the order Cu>Cd>Pb. The LC50 values recorded for M. rosenbergii were 
higher than the values recorded for P. monodon, hence the specific metals were more toxic to P. 
monodon than M. rosenbergii. The safe concentrations for all these metals were also calculated. This 
study has produced LC50 values that may be useful in screening potentially toxic substances in our 
waters. 
 
Key words: Toxicity, heavy metals, shrimp, post larvae.