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Articles by O.M. Popoola
Total Records ( 4 ) for O.M. Popoola
  O.T. Adebayo and O.M. Popoola
  The study examined the effect of varying storage period on the efficacy of frog pituitary with the aim of determining the optimum period required for effectively enhancing induction ovulalation, maturation and artificial propagation of Clarias gariepinus. Acetones dried pituitary extract obtained from non piscine source, the African bullfrog (Rana adspersa, were stored over a period of 16 weeks and used to induce spawning in the female Clarias gariepinus). Fresh pituitary extract was used as control having being previously worked upon and confirmed to be effective. There were significant differences in percentage fertilization of the eggs with the fresh hormone giving the highest yield and the hormone stored for 3 and 4 months giving least. The hormone stored for 4 weeks gave relatively high percentage fertilization and can therefore be used as optimum storage period.
  O.M. Popoola and M.O. Olufayo
  The effect of sub lethal concentration of promethazine hydrochloride (phenergan) on gills of Oreochromis niloticus (mean weight and length, 20 g and 12.13 cm, respectively) was investigated under static bioassay for 96 h. The fish treated with promethazine hydrochloride showed abnormal behaviour characterized eratic movement, loss of reflex and hyperventilation during the period of exposure. The LC50 of phenergan for O. niloticus was determined to be 0.035 g L1. Histological analysis of the gills showed pathological changes in sub lethal levels tested, caused detachment of epithelial in the primary and secondary lamella. Osmoregulatory and respiratory weakness brought about mucus accumulation couple with epithelia detachment was suggested to cause fish mortality after the exposure to promethazine hydrochloride.
  O.T. Adebayo and O.M. Popoola
  The efficacy and cost of utilization of the pituitary extract of African bull frog (Rana adspersa) (FPE) and Clarias gariepinus (CPE) and Ovaprim in the artificial breeding of the African catfish Clarias gariepinus was compared. The extraction and dosage are discussed along side the preliminary rearing of fries in the outdoor hatchery tanks. Three C. gariepinus were injected with 0.5 mL of Ovaprim in one dose while the remaining six were injected with the pituitary extract of frog (Rana adspersa) and C. gariepinus pituitary extract in one dose at the rate of 1 mL kgG1 of the glands. C. gariepinus injected with Ovaprim had the highest percentage fertilization (84.5%) which was significantly different from other treatments. Percentage hatchability was high and ranged from 51.5-73.0% in the different hormones treatments. The percentage hatchability shows similar pattern to percentage fertilization and latency period was 12 h for all the treatments. The cost of production was highest in CPE followed by Ovaprim and least in FPE and were significantly different (p< 0.05) from one another. The results show that the synthetic hormone (Ovaprim) is more effective than the Frog Pituitary Extract (FPE) and Clarias Pituitary Extract (CPE).
  O.T. Adebayo , K.A. Ayinde and O.M. Popoola
  The effects of different concentrations of cassava effluent on eggs and larvae of Clarias gariepinus were evaluated in this study. Based on the range finding test, five concentrations of the effluent 0% (control), 2, 4, 6 and 8% were tested. There was significant difference (p< 0.05) in the percentage fertlisation of C. gariepinus eggs subjected to the various treatments. The higher concentrations of cassava effluents, 8, 6 and 4% were very toxic, less than 20% hatching success. The hatching percentage was inversely proportional to the effluent concentration (from 90.00±1.0% in the control to 16.00±1.5% in 8% cassava effluent concentration). Hatching started (22.0±1.0) hours after fertilization in control media (0% concentration) and lasted for 24.5±0.1 h while hatching began at 23.0±0.5 and 24.5±0.5 h in the 2 and 8% concentrations. There was significant (p< 0.05) difference in MT50 in all the tested concentrations. The MT100 were not similar (p< 0.05) in all the tested concentrations of effluents. Based on the result of this study, cassava effluents adversely affected fish reproductive performance and larvae survival. Therefore, cassava effluents should be diverted away from pond waters.
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