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Articles by O.T. Adebayo
Total Records ( 7 ) for O.T. Adebayo
  O.T. Adebayo and O.A. Fatoyinbo
  Acetone dried pituitary extract obtained from African bullfrog, Rana adspersa, was stored over a period of 16 weeks and used to induce spawning in the female Clarias gariepinus. Fresh pituitary extract was used as control. Fecundity and egg weight decreased with storage period. Fish injected with pituitary extract stored for 12 weeks and above had significantly (p<0.05) lower % fertilization and % hatching compared with fish stored for less than 4 weeks. The potency and viability of R. adspersa pituitary extracts decreased with storage periods. The results of this study indicated that stored R. adspersa pituitary hormone extract stored for 4 weeks gave the best result. Its yield was significantly different from that gotten using hormones stored for over 8 to 16 weeks period. It showed that the frog pituitary extract is still potent, viable and effective when stored for not more than 4 weeks. The R. adspersa pituitary hormone stored for 4 weeks can therefore be used as optimum storage period under the experimental conditions used in this study.
  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.T. Adebayo and O.A. Fatoyinbo
  M.A. Adebayo , J.F. Adediji , A.A. Adebayo and O.T. Adebayo
  The biosorption of Ni2+ by Streblus asper, biomass was investigated in single metal solution. Batch kinetic studies were carried out in order to determine effect of adsorbent and adsorbate dose, pH of solution, agitation time and temperature on biosorption of Streblus asper. The maximum Ni2+ biosorption was obtained at pH 6.0. The equilibrium nature of Ni2+ biosorption was described by the Freundlich and Dubinin-Radushkevich isotherms. The value of n, the intensity of adsorption, is ≈2 indicating that Ni2+ is favourably biosorbed by Streblus asper. The saturation capacity, qm, of Ni2+ by Streblus asper was calculated to be 40.48 mg g-1. The value of the mean free energy of biosorption was calculated to be 4082.48 kJ mol-1 which indicates that the biosorption may occur via a chemical ion-exchange mechanism. The results of the thermodynamic investigations indicated that the adsorption reactions were spontaneous (ΔG<0), endothermic (ΔH>0) and irreversible (ΔS>0). The pseudo second-order kinetic model was used to analyse the kinetic data. The second order rate constants for the biosorption of Ni2+ from solutions by Streblus asper was evaluated to be 1.35 g mg-1 min-1.
  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.
  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).
  A.A. Akinwande , O.A. Fagbenro and O.T. Adebayo
  Interspecific hybrids of Clarias gariepinus and Clarias anguillaris were produced by employing the technique of hypophysation and dry stripping. Investigations on their aquaculture potential in terms of growth and survival were carried out. About 2 weeks old fry (0.06±0.02 g) of the parental Clarias species and their interspecific hybrids were stocked in hapa nets (1 m2) suspended in outdoor earthen ponds (16 m2) in triplicates for a rearing period of 56 days. Weight increase in the parentals and the reciprocal hybrids were assessed fortnightly. Studies revealed that the growth of the hybrids were intermediate to the parental Clarias gariepinus but higher than Clarias anguillaris. The weight gain attained by Clarias gariepinus, Clarias anguillaris, C. gariepinus (♂) x C. anguillaris (♀) and C. anguillaris (♂) x C. gariepinus (♀) were 3.18, 2.99, 3.16 and 3.05 g, respectively. Among the interspecific hybrids, the growth of C. gariepinus (♂) x C. gariepinus (♀) was higher than its reciprocal hybrid cross of C. anguillaris (♂) x C. gariepinus(♀). Survival of the reciprocal hybrid crosses at 8 weeks were also intermediate to that of the parental Clarias gariepinus but higher than C. anguillaris. Hybrids displayed positive heterosis for weight gain (0.65%) and survival (0.80%). The superiority of these growth traits of the hybrid groups at least over one of the parentals indicates hybrid vigor. Hence, hybrids in both directions appear to have considerable potential for use in aquaculture.
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