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Article Title: Acute and Sub- lethal Toxicity of used Drilling Mud in G. pelli, Niger Delta Nigeria.


Toxicity test are carried out to determine the effects of complex chemical mixtures, such as waste drilling mud, on aquatic ecosystems. Several aquatic bodies in the Niger Delta region of Nigeria are been affected by crude oil and hydrocarbons which are of anthropogenic contribution and a wide spectrum of petroleum contaminants are detected in water sediments and animals. The experimental approach for this present study involved the exposure of ten of the mangrove crab Goniopsis.pelii to six acute concentrations of drilling mud representing 0% (control), 10%, 20%, 30%, 40% and 50% for 96 hours in three replicates after the range finding test was conducted. In addition, after obtaining the LC50 from the acute toxicity test, the test organism was exposed to four sub-lethal concentrations of drilling mud (0%, 5%, 10% and 15%) for 21 days. the results showed that drilling mud had adverse effect on G.pelli with increase in concentration. therefore discharge of waste drilling mud into the aquatic ecosystem should be discouraged.