Bacterial Population of an Oilfield Wastewater in Nigeria

Evaluation of Metabolites of <i>Clarias gariepinus</i> Exposed to Sub-Lethal Concentrations of Oilfield Wastewater

“…However, Richards [29] reported that the main cause of mortality in aquarium fish was the inadequate maintenance of the water environment. The characteristics of the oilfield wastewater used in this study have been evaluated by Akani and Gabriel [19]; the values agree with that of Wemedo et al [30] but differ from that of Obire and Amusan [31]. Akani and Gabriel [21] reported that all the physico-chemical properties except temperature, DO, BOD and THC fell above acceptable limits of the Federal Environmental Protection Agency [32] of 35°C, 5.0 ppm, 50.0 ppm and 48.0 ppm respectively.…”

“…Preliminary investigation was conducted to determine the range of concentrations of oilfield wastewater that exhibited sub-lethal effect on the C. gariepinus. Five concentrations (10,30,50,70 and 100) of the oilfield wastewater were prepared by serially diluting from each effluent sample on a volume to volume (v/v) ratio so that the percentage (%) concentration in each test solution was obtained as shown below…”

“…Based on the results of the preliminary investigation, six [0.00 (control), 10,20,30,40,50, and 60% v/v] test concentrations, each with four replicates were used. A fish was then introduced into each of these concentrations contained in an aquarium and incubated for a period of 28 days at room temperature (30±2°C).…”

Prevalence and Antibiogram of Gram-negative Bacteria Isolated from Well Water in Ula-Ubie Community, Ahoada West, Nigeria

“…The microbiological analysis of the samples involved enumeration and isolation of the bacteria present in the different samples. The microbial population in the water samples was enumerated using the tenfold serial dilution as described by Wemedo et al [13]. In this method, one milliliter of the water sample was transferred The map of the stations where samples were Fifty (50) well water (underground water) samples were collected in sterile containers from ten different stations in the community.…”

Enzymatic responses of Clarias gariepinus (Burchell, 1822) exposed to sub-lethal concentrations of an oilfield wastewater

“…It contains toxic inorganic and organic constituents such as polyaromatic hydrocarbons, metals such as lead, nickel, chromium and zinc that are potentially hazardous and cause major damages to aquatic and agricultural resources when discharged into the environment [2][3][4][5][6]. Toxicity bioassays involving brent produced water with oyster larvae, water flea (Daphnia magna), and shrimp (Salmo gairdneri) indicated that it was only toxic at dilutions of less than 20-fold, thereby implying that the toxicity of produced water could be reduced by the dilution effect of sea water in offshore situations [7].…”