ISSN 2756-3626
Global Journal of Plant and Soil Sciences Vol. 4 (3), pp. 001-005, March, 2020. © International Scholars Journals
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.
Accepted 12 November, 2019
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.