Department of Fisheries, Aquaculture and Wildlife - Scholarly Publications
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Item Effect of Saccharomyces cerevisiae on the Survival rate and Growth performance of Clarias gariepinus (Burchell, 1822)(Production Agriculture and Technology (PAT), 2024) Sadiq, Hauwa OhuneneThis study evaluated the efficacy of including Saccharomyces cerevisiae, Brewer’s yeast in the diet of Clarias gariepinus. Two hundred and twenty-five C. gariepinus sourced from Fisheries and Aquaculture Research Farm, Federal University Wukari, were used for the study. The fish were conditioned for 14 days, distributed into the experimental tanks consisting of 45 fish per treatment in three replicates in a completely randomised design model and were fed for 84 days. Five experimental diets were formulated with brewer’s yeast replacing fishmeal at 0% 25%, 50%, 75%, and 100% inclusion levels. The fish were fed 5% of their body weight twice daily. Growth parameters such as mean weight gain, specific growth rate, and survival rate were evaluated. The water quality parameters were monitored and recorded throughout the period of experiment. The results showed significant (p<0.05) differences on the feed intake (911.67g/day – 1120.33g/day), weight gain (401.7g – 459.0g), and specific growth rate (0.80g/day - 0.88g/day) of C. gariepinus. This apparently suggested that S. cerevisiae is a potential economical and nutritious feed ingredient for fish. Based on this finding, it was concluded that Saccharomyces cerevisiae can be included in fish diet up to 75% without impacting negatively on the growth performance of Clarias gariepinus.Item Use of maize cob-activated charcoal for wastewater treatment in aquaculture for reuse(African Journal of Agriculture and Allied Sciences (AJAAS), 2024) Sadiq, Hauwa OhuneneThis study investigated the efficacy of activated charcoal made from maize cobs for processing wastewater obtained from aquaculture. The main objective was to develop a low-cost and efficient way to recycle wastewater for aquaculture, part of efforts to tackle water scarcity in Northeast Nigeria. The research evaluated the efficiency of activated charcoal derived from maize cobs in treating aquaculture wastewater, optimal treatment duration, and its impact on the survival rate of Clarias gariepinus. Carbonizing maize cob charcoal was achieved by burning dry maize cobs in a 5L tin as a makeshift kiln with little or no air and activated using lemon juice. The treatment efficiency of the activated charcoal was tested by assessing water quality parameters before and after treatments. Results of pH and ammonia in this study reduced from 8.60 to 7.68 and 1.50 to 0.31 mg/l respectively while dissolved oxygen increased from 3.06 to 3.51 mg/l after a 24-hour treatment period. Clarias gariepinus cultured for 56 days in the treated water had a growth of 12.11g from 2.00g, a total length of 4.82cm, a specific growth rate of 3.22%/d, and an 86.67% survival rate. This study concludes that the use of maize cob-activated charcoal is a suitable and affordable method for treating aquaculture wastewater for reuse, improving fish survival and growth rates.