Browsing by Author "Ayanwale Adesola Victoria"

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    Influence of Temperature on Survivorship and Growth Performance of Heteroclarias Fingerlings under Laboratory Conditions
    (Advance in Agriculture and Biology, 2014) Kolo Reuben Jiya; Ayanwale Adesola Victoria; Lamai Solomon Lambuda; Tsadu S. M; Falusi F. M; Baba B. M
    The need for a beter understanding of the environmental factors that influence productivity of artificial culture of Heteroclarias fish species informed this study. To this end, the effects of different temperature levels, ranging from 27.00 - 32.00°C, on the survival and growth of the fish species was monitored over a period of 12 weeks, under laboratory conditions; following standard procedures. The results showed that temperature had no significant (P>0.05) effects on total and standard lengths (range = 8.16±0.28cm at 30.000C, to 8.68±0.40cm at 26.91°C; and 7.30±0.23 at 28.00/32.000C to7.63±0.67 at 26.910C, respectively). Body weight (BW), on the other hand, reduced significantly (P<0.05) with increasing water temperature (range = 190.55±31.50g at 26.91°C, to 154.37°C±15.25g at 32.00°C). Likewise, the indices of weight gain namely, Final Body Weight Gain and Percentage Weight Gain reduced significantly with increasing temperature. However, the mortality of the fishes was not significantly different (P>0.05) among the temperature-treatment groups. The findings of this study should aid the fine-tuning of field management protocols of Heterclarias artificial culture for optimum productivity.
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    Influence Of Water Aeration Levels on the Opercular Respiratory Beats and Selected Water Quality Parameters of Heteroclarias Fingerlings under Laboratory Conditions in Minna, Nigeria
    (Tropical Freshwater Biology, 2019) Kolo Reuben Jiya; Ayanwale Adesola Victoria; Iliya Auta Yohanna; Keke Unique
    A twelve (12) week experiment was carried out to determine the influence of water aeration on the Opercular Respiratory Beats (ORB) and selected water quality parameters of 1,800 Heteroclarias fingerlings of average weight of 1.40 g under laboratory conditions. One hundred and fifty fingerlings were allotted in a complete randomized design into water aeration levels: 0.00(control), 6.00, 12.00 and 24.00 hours respectively as treatments and replicated thrice. The ORB and water quality parameters were determined weekly based on standard procedures .Water quality parameters investigated were not influenced by water aeration except the Dissolved Oxygen (DO) concentration in the control that was significantly (p<0.05) reduced. The respiratory beats (ranged from 51.60±5.94 to 53.17±3.77operculum beats per minutes) of fishes aerated within the investigated range of 6.00 – 24.00 hours were not significantly (P>0.05) different at the end of the 12th week. At the 2nd, 8th and 10th weeks, respiratory beats of the Heteroclarias fingerlings were not significantly (P>0.05) different among the treatments. However, in the 1st and 7th weeks respiratory beats were significantly (P<0.05) higher among the fishes not aerated (131.63±8.35operculum beats per minute) and those aerated (76.33±10.75 operculum beats per minute) for 6.00 hours. The ORB decreased with increase in fish size from week 1 to the end of the study. The research also showed that water aeration had no influence on the water quality parameters except DO of the controlled fingerlings. Water aeration had influence on ORB only at the 1st and 7th weeks of the experiment but no significant influence was recorded during the greater period of investigation. As a recommendation, fish farmers are advised to monitor the dissolved oxygen concentration daily in their ponds to ascertain when aeration is necessary. Findings of this research also remove the fears of maintenance cost of using Air pump.
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    Physiological Responses of the Heterobranchus Bidorsalis (Male) X Clarias Gariepinus (Female) Hybrid (Heteroclarias) Fingerlings to Different Temperature Levels under Laboratory Conditions
    (World Academy of Science, Engineering and Technology, 2015) Kolo Reuben Jiya; Ayanwale Adesola Victoria; Iliya Auta Yohanna; Mohammed A. Z.; Lamai S. L.; Tsadu S. M.
    A twelve weeks experiment was carried out on Heteroclarias freshwater hybrid fish fingerlings under laboratory conditions to study the effects of different temperature levels, 26.91 (control), 28.00, 30.00, 32.00°C respectively and their physiological responses to oxygen consumption, ammonia excretion and opercular respiratory beats were evaluated. The oxygen consumption, ammonia excretion and opercular respiratory beats were determined weekly based on standard procedures. The findings revealed that the oxygen consumption of Heteroclarias hybrid fingerlings significantly (p<0.05) increased with increase in temperature. The ammonia excretion were not significantly different (p>0.05) in all the temperature levels. The opercular respiratory beats per minutes showed similar trend in weeks 1,2,4 and 8 but indicated significantly higher (p<0.05) opercular respiratory beats (range= 117.10±2.26 at 30oC to 142.75±3.04 opercular beat at 32oC in week 8) at highest tested temperature levels. However, there was a decreasing trend in the opercular respiratory beats per minute of the controlled fingerlings. Generally, the opercular respiratory beats per minute decreased with increase in fish size. The findings of this study confirmed that increase in water temperature affects the physiology of Heteroclarias hybrid and hence for effective rearing and for profit making, it is essential for the hybrid to be cultured in the temperature range between 26.91°C (control) to 28.00°C