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Articles by O.A. Sogbesan
Total Records ( 4 ) for O.A. Sogbesan
  O.A. Sogbesan , C.T. Madu and A.A.A. Ugwumba
  Two hundred and forty Bufo maculata tadpoles of weight range 0.038-0.045 g (mean weight 0.04±0.008) g and lengths 1.2-1.6 cm (mean 1.4±0.018 cm) were randomly selected from a breeding tanks (2.0H 2.0H1.0 m) and raised in outdoor concrete culture tanks (1.0H1.0H0.75 m) for 84 days and monitored for growth, productivity and nutrient utilization. Tadpole were harvested, processed into meal and used in compounding five experimental diets of 42.5% crude protein to replace fish meal at different inclusion levels of 0% (control), 25, 50, 75 and 100% fed to Heterobranchus longifilis fingerlings. The mean weight gain for cultured tadpole was 3.16 g/tadpole; specific growth rate 2.21% and feed conversion ratio, 1.04. The result of the feeding experiment shows that WG, RGW, SGR, FCR and feed intake favoured fingerlings fed 50 and 25% whole tadpole meal inclusion diets with insignificant difference p< 0.05 compared to other treatments. Highest insignificant difference p< 0.05 apparent crude protein digestibility of 90.88% was in 25% whole tadpole meal. Better cost benefit ratio was reported in 25 and 50% whole tadpole meal diets. Based on the result of this study, the replacement of tadpole meal is recommended to 50% inclusion levels in the diet of H. longifilis for better growth performance, feed utilization, health status and cost benefits.
  O.A. Sogbesan , A.A.A. Ugwumba , C.T. Madu , S.S. Eze and J. Isa
  The potential of soil and agro-allied waste substrates in vermiculture was assessedin terms of their efficiency for growth, reproductive performance and zoomass production of cultured earthworms (Hyperiodrilus euryaulos). Four wooden boxes were stocked in duplicates with 50 matured H. euryaulos of average weight 1.94`0.2 g and cultured for 12 weeks. Harvested earthworms were dried, used to formulate five 42.5% isoproteic diets and 1900 kJ/100 g isocaloric diets and fed to fingerlings of Heterobranchus longifilis for 70 days. In both vermireactors, the earthworm grew very well with significantly different (p< 0.05) mean weight gain, 304.25 and 208.15 g ffom agro-allied and soil substrate respectively. Significantly (p< 0.05) higher specific growth rate of 0.73% day-1 and reproductive performance of 2,120 worms kg-1 of substrate were from agro-allied substrate compared to 0.59% day-1 and 1,914 worms kg-1 of substrate, respectively from soil substrate worms. The highest percentage weight gain, 400.5% fish-1 and specific growth rate of 0.999% day-1 were in fish fed control diet. The lowest feed conversion rate, 1.51; highest protein efficiency ratio, 1.52 and apparent net protein utilization, 52.48% were from 25% earthworm meal diet. The highest daily energy gain 3.34 kJ fish-1 day-1 was from the control diet. There was significant differences (p< 0.05) between the growth and feed utilization indices. Haematocrit level, haemoglobin concentration and leucocyte count improved with earthworm inclusion levels. The highest profit index, 9.33; lowest incidence of cost, 1.17 and highest cost benefit, 2.38 were from 25% earthworm meal diet. Based on results from this study agro-allied waste substrate could be a better culture substrate for H. euryaulosthan soil substrate and 7.5 to 25% earthworm meal inclusion is recommended in the diet of H. longifilis fingerlings for profitable and sustainable aquaculture practices.
  B.P. Kwaji , O.A. Sogbesan and K.J. Peter
  Artisanal fishery has been of immense importance to human existence worldwide. Fishing regulations have not been effective due to non-compliance. This is disastrous to the fisheries as it could lead to collapse and fishery closure. The study was carried out to ascertain the fisher’s compliance with fishing regulations in lakes Geriyo and Ribadu, Nigeria. Data were collected through surveys and enumerator interview from forty-two respondents; twenty-one in each lake. Data collected were analysed using descriptive statistics and t-test with Microsoft Excel 2007. Result shows that ban on explosives was the most complied regulation in lake Geriyo (100%) while the most violated was mesh size regulation (47%). In lake Ribadu, ban on explosives was also the most complied regulation (100%) while the least was also mesh size regulation (33.33%). The respondent’s compliance in the lakes was significant (p<0.05). Economic reason was the primary and leading motive for non-compliance with regulations in the study areas. Government should tackle fisher’s low economic status, invest in their education, enlighten them on the need for conservation, step-up regulation enforcement and integrate the fishers as key stakeholders in any fisheries management plan.
  O.A. Sogbesan and C.T. Madu
  Isoproteic and isoenergetic diets containing 0% (control), 25, 50, 75 and 100% dried earthworm meal were fed to 250 fingerlings of Heterobranchus longifilis of weight range 2.35-3.03 g and average weight 2.68`0.29 g for 56 days experimental period. The results of the experiment showed that the water quality parameters were not affected as the inclusion level of the earthworm meal increased. The growth rates were not similar. The highest mean weight gain of 6.45 g fish-1, relative growth rate of 240.67%/fish and specific growth rate of 0.9507%/fish were recorded in fish fed 25% earthworm inclusion diet. The lowest feed conversion rate of 1.51, highest protein efficiency ratio and productive protein value of 1.52 and 52.48, respectively were also recorded in fish fed 25% earthworm meal inclusion diet. The highest energy retention of 1.04 and lowest of 0.50 were recorded from 100% earthworm meal inclusion diet and the control, respectively. The lowest feed production cost of 56.32 k kg-1 of feed, lowest incidence of cost, 1.71 and highest profit index, 9.33 were recorded from fish fed 100% earthworm meal inclusion diet. Based on the result from this experiment 25% replacement of fish meal by earthworm meal is recommended in the diet of H. longifilis fingerlings for profitable and sustainable aquaculture practices.
 
 
 
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