[sup][/sup]Acute toxicity of Nigerian crude oil (Bonny Light) to Desmocaris trispinosa (Crustacea, Palaemonidae)
Journal Title: Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society - Year 2011, Vol 4, Issue 5
Abstract
The acute toxic effects of a Nigerian crude oil (Bonny Light) to freshwater shrimp, Desmocaris trispinosa were studied in toxicity bioassay. The test organisms were exposed to crude oil in a static renewal bioassay for 96 hrs. There was an initial range-finding test to determine the concentrations of crude oil to be administered on the test organisms in the definitive test. Five concentrations of the crude oil were prepared in the definitive test as 40, 80, 160, 240 and 320 mgL[sup]-[/sup][sup]1[/sup]and a control experiment (0 mgL[sup]-1[/sup]). The median lethal concentration (LC[sub]50[/sub]) at 24-hr, 48-hr, 72-hr and 96-hr was 0, 0, 281.84 and 120.23 mgL[sup]-1[/sup]respectively. The median lethal time (LT[sub]50[/sub]) at crude oil concentrations of 160 mgL[sup]-1[/sup], 240 mgL[sup]-1[/sup]and 320 mgL[sup]-1[/sup]were 89.5hrs, 80.7hrs and 53.3hrs respectively while the LT50 at concentrations of 40 mgL[sup]-1[/sup]and 80 mgL[sup]-1[/sup]was 0hr. Mortality increased with increase in crude oil concentration and the difference was significant (p<0.05). The present findings indicates that Bonny Light crude oil have mortality effects on D. trispinosa and may adversely affect other aquatic organisms.
Authors and Affiliations
Prince Ndimele
Keywords
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