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Articles by R.G. Okayi
Total Records ( 2 ) for R.G. Okayi
  R.M. Iorhiin , P.A. Annune , R.G. Okayi and M.E. Oyeniyi
  The study was designed to determine the distribution and abundance of phytoplankton in River Benue at Makurdi, Benue state. Studies were carried out from September 2014-August 2015 with sample collection from four different sites along the river. Twenty six species of phytoplankton were identified. Chlorophyta species were dominant with 50%, followed by bacciliarophyta (25%), dinophyta (5%), euglenophyta (3%), chrysophyta (1.5%) and rhodophyta (0.5%). High population density and biomass of plankton was observed during the months of dry season. Shannon weiner index ranged between 3.74-3.79 across the sites and the Lower River Benue at Makurdi was classified as highly diversed as values of Shannon weiner index were above 3.5 at all sampled sites. There significant variations observed in water quality and plankton abundance at different sample sites and seasons.
  R.G. Okayi , M.U. Tachia , G.A. Ataguba and S.H. Dikwahal
  A static bioassay method to determine the acute toxicity of the herbicide propanil to Oreochromis niloticus was investigated under laboratory conditions for 96 h exposure period. Concentrations of propanil used include: 0.0096, 0.0103, 0.011 and 0.012 ml L-1, respectively. The lethal concentration (LC50) value of propanil on fingerlings of Oreochromis niloticus was 0.0097 ml L-1 for 96 h of exposure. The regression equation for probit kill from propanil was found to be Y = 29.84+12.33xlog conc. (R2 = 0.9951, Y = Probit kill). Fish showed various abnormal behaviors upon exposure to propanil. Immediate reaction was erratic swimming and tendency to jump out of the test bowl. Others include restlessness, un-coordinated movement, vertical swimming, air gulping, equilibrium loss, a period of quiescence and eventually death.
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