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Assessment of the response of Goniopsis pelii (Decapoda, Graspidae) to crude oil in static bioassay

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Author(s): Alice Ekwu | Arit I. Utong | Blessing J. Oribhabor

Journal: Advances in Environmental Sciences
ISSN 2066-7620

Volume: 4;
Issue: 3;
Start page: 165;
Date: 2012;
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Keywords: bonny light crude oil | Goniopsis pelii | static bioassay | tidal creek | Nigeria

ABSTRACT
The assessment of acute toxicity of Nigeria Bonny light crude oil against purple mangrovecrab, Goniopsis pelii of a tidal creek, Oron, Akwa Ibom State, Nigeria was conducted in the University ofUyo, Uyo, Nigeria Fisheries laboratory under static bioassay in November, 2009. The crude oil was poorlytoxic to the test organism, causing delayed mortality and consequent extension of the bioassay to 8days. The LC50 indicated that the toxicity of the test compound was higher on the 8 day than at 96 hour,with a toxicity factor indicating that the crude oil was 3 times more toxic against G. pelii on the 8 daythan at 96 hour. Paired t-test showed that there was no significant difference (p>0.05) between 96h LC50(791.9 ml L-1) and 8d LC50 (275.8ml L-1). This study showed that G. pelii is not an early warning indicatorfor oil toxicity but its response during spills could serve as a good indicator of adverse impact.
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