Ecology, Environment and Conservation Paper

Vol.12, Issue 01, 2006; Page No.(1-7)

SHORT-TERM TOXICOLOGY AND ACCUMULATION OF HEAVY MET- ALS BY AFRICAN GIANT RIVER PRAWN, MACROBRACHIUM VOLLENHOEVENII(HERKLOTS, 1857) ON EXPOSE TO TREATED INDUSTRIAL EFFLUENTS

L.O. Chukwu

Abstract

The acute toxic effects and accumulation of heavy metals in decapod crustacean, Maerobrachium vollenhoevenii (Herklots, 1857) following short-term exposure to treated industrial effluent was evaluated in laboratory bioassays. The effluent was found to be toxic to the prawns with 96hr LC of 54.31% effluent by volume. Analysis of prawn metal burden showed that the prawns' bio concentrated trace metals 2-3 times above the levels existing in the exposure medium. The accumulation of metals in whole shrimps was in decreasing order, Pb, Zn, Cu, Fe, Mn, Ni and Cr. Metal uptake correlated positively (P<0.05) with concentration of effluent. The prawn body metal burden indicated that the gut recorded the highest concentration followed by cephalothorax and chela.

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