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Toxicity study of the oil dispersant Corexit 9527 on Macrobrachium rosenbergii (de Man) EGG hatchability by using a flow-through bioassay technique



Toxicity study of the oil dispersant Corexit 9527 on Macrobrachium rosenbergii (de Man) EGG hatchability by using a flow-through bioassay technique



Environmental Pollution 88(3): 341-343



The effect of the oil-spill dispersant Corexit 9527 on egg-hatching rate of Macrobrachium rosenbergii (de Man) was studied by using an innovated flow-through bioassay technique. This bioassay method relies on the fact that M. rosenbergii fertilized eggs when detached from the mother prawn were able to hatch artificially. The flow-through system generated a stable and good water quality environment for hatching the eggs successfully. The Corexit 9527 had a pronounced effect on hatching rate of the M. rosenbergii eggs. In the control, the hatching rate of the eggs was 95.55% +/- 1.74%. However, it was reduced drastically with increasing concentrations of Corexit 9527. A 100% inhibition of egg hatchability was found when the level of Corexit 9527 was higher than 250 mg litre(-1). The EC(50) and the EC(95) values estimated by the probit method were 80.4 +/- 5.5 mg litre(-1) and 193.5 +/- 39.9 mg litre(-1) respectively (P = 0.05). The recommended safety level of Corexit 9527 for M. rosenbergii in Malaysian estuarine waters is below 40 mg litre(-1).

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Accession: 009658098

Download citation: RISBibTeXText

PMID: 15091547

DOI: 10.1016/0269-7491(95)93448-9



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