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Articles by F.D. Sikoki
Total Records ( 5 ) for F.D. Sikoki
  A. Uka , F.D. Sikoki and M.O. Edun
  Tilapia guineensis eggs were hatched in different salinities (17, 12, 7, 5, 2 and 0 ppt). The study was conducted in eight replicates. The aim of the investigation was to ascertain disparity in hatching size of Tilapia guineensis attributable to salinity. Immediately hatching was observed, body weight of five hatchlings in each replicate was individually weighed in milligram. The individual total length of the five hatchlings was also measured in millimeter. The height of the yolk sac larva was determined with micrometer screw gauge graduated in millimeter from the top of the yolk sac to the dorsal region of the larva. Data obtained were used to calculate yolk sac volume. Significant differences (p<0.01) were observed in body weight and total length of larvae hatched in different salinities. The heaviest and longest larvae were hatched in 12 ppt saline water. The yolk sac volume of larvae hatched in lower salinities were significantly higher (p<0.01) than the yolk sac volume of larvae hatched in higher salinities. The smallest yolk sac volume was recorded in 12 ppt saline water. The findings show that salinity could be manipulated for economic production of larger seeds of Tilapia guineensis.
  F.D. Sikoki and I.N. Anyanwu
  Spatial and temporal variations of physicochemical variables of Onu-Iyi-Ukwu stream were studied for 12 months from March 2005 to February 2006. Three sampling stations were established along the main stream channel from source to mouth. Spatial variation in physicochemical parameters indicated that total alkalinity, total hardness, conductivity and nitrate-nitrogen (NO3) recorded their highest values at the upper reaches (with values 14.0 mg L-1, 88.09 mg L-1, 17.00 μS cm-1 and 0.60 mg L-1, respectively). Dissolved Oxygen (DO) and pH had their maximum values of 8.20 and 6.94 mg L-1 at the middle reaches. Turbidity, Biochemical Oxygen Demand (BOD), temperature and phosphate-phosphorus (PO4) increased steadily from source to mouth. The observed seasonal variation indicated that wet season values were higher for all the parameters except temperature, turbidity, phosphate-phosphorus (PO4) and total alkalinity although the values were not statistically significant at p>0.05. The correlation coefficient (R) showed no significant relationships at p<0.05 between physicochemical parameters except DO and BOD with correlation values of 0.75 and -0.54, respectively.
  I.F. Vincent-Akpu and F.D. Sikoki
  Pollution arising from petroleum exploration is one of the major challenges facing the inhabitants of Niger Delta region in Nigeria. The toxicity of parateq, a synthetic base mud, on the microbial population of Oreochromis niloticus fingerling was evaluated in the laboratory. The fingerlings were exposed to different concentrations (0, 1000, 3000, 5000 and 9000 mg L-1) of drilling fluid. Fish mortality data were recorded at 24, 48, 72 and 96 h and analysed using Finney’s Probit Analysis method to calculate LC50 values (concentration of drilling fluid in water that will kill 50% of the fish population in 96 h). The 96 h LC50 was 2210 mg L-1. The mortality increased with increase in concentration while, the lethal times decreased as concentration increased. The bacterial biomass ranged from 1.59x108-6.0x106 CFU mL-1 while fungal biomass ranged from 1.0x103-2.1x104 CFU mL-1. Results revealed that there was an increase in fungal biomass with increase in mud concentration and a decrease in bacterial biomass with increase in mud concentration.
  K.E. Lelei and F.D. Sikoki
  The effects of Goldcrew, a chemical dispersant commonly used in crude oil spill incidents to alter interactions between the components of the crude oil and the biota in the ecosystem were studied. We used a static renewal bioassay to study its effects on Bonny light crude oil using the tilapia, Oreochromis niloticus at various concentrations for fifty days. A control experiment was also set up. The exposure concentrations of the Water Accommodated Fractions (WAF) of the mixture of the dispersant and Bonny light crude oil, Dispersed Crude Oil (DCOWAF-PAH) and the WAF of the Bonny light Crude Oil alone (COWAF - PAH) were 0.2,0.4,0.8 and 1.6 mL L-1, respectively. The mortalities of the fingerlings in the different concentrations of the DCOWAF-PAH were 66.7, 23.3, 86.75 and 100% in the 0.2, 0.4, 0.8 and 1.6 mL L-1 exposure concentrations, respectively. At these concentrations, mortality was significantly different (p<0.05) between the fingerlings and fry with a total mortality of 69.2% among the fingerlings while the fry had 5.8% mortality in the 0.8 and 1.6 mL L-1 concentrations with 13.3 and 10.0%, respectively but the differences were not statistically significant (p<0.05). There was no mortality in the concentrations of the COWAF – PAH. It can be said that the Bonny light crude oil was made more toxic to O. niloticus by the presence of the dispersant and increased the susceptibility of the fingerlings of the fish to the mixture of the crude oil and dispersant and influenced the behaviour of the fish. There is, therefore, need to apply dispersants with caution especially around fish breeding and nursery grounds.
  K.E. Lelei , F.D. Sikoki and O.I. Enodiana
  The physico-chemical water variables of water samples contaminated with a mixture of the Water Accomodated Fractions (WAF) of dispersed and undispersed phases of Bonny Light crude oil at sub-lethal concentrations of 0.2, 0.4, 0.8 and 1.6 mL L-1 were analysed to assess the effects of these mixtures on the water quality of the test media containing a fish, Oreochromis niloticus. These were measured against a control. The temperature, pH, DO, TDS, conductivity and redox potential of the test media were significantly affected (p<0.05) by the presence of the mixture especially by the dispersed phase at the different concentrations and these were positively correlated.
 
 
 
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