article · Asian Journal of Fisheries and Aquatic Research
An evaluation of water quality for fisheries was conducted at the Hashidu reservoir along the River Gongola over a six-month period spanning both dry and rainy seasons. Water samples collected monthly from three sites were examined for key physicochemical parameters, including dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, electrical conductivity, pH, and temperature, alongside major anions such as nitrate, phosphate, sulphate, chloride, and fluoride. The seasonal measurements revealed variations across several variables, with higher electrical conductivity, chloride, and biochemical oxygen demand observed during the rainy season. While the majority of measured parameters aligned with thresholds established by the World Health Organisation, levels of pH, temperature, and phosphate deviated from these guidelines. Consequently, regular and ongoing monitoring of the reservoir is required to support the sustainable management of local aquatic resources.
Understanding reservoir water conditions is vital for sustaining healthy fish habitats and freshwater ecosystems. Tracking seasonal shifts in water quality helps local environmental managers detect contamination early and recognise when critical indicators exceed safety limits. This baseline information assists authorities in making informed decisions to safeguard communal water resources and maintain productive fisheries.
This research represents early-stage environmental monitoring rather than a direct commercial product. The data could be utilised by fisheries managers, environmental protection agencies, and river basin authorities to design targeted catchment management plans and monitoring protocols. However, the abstract does not indicate an immediate commercial application pathway.
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Aims: This study aim to assess the water quality in relation to fisheries of Hashidu reservoir. Study Design: Water samples for the physicochemical analysis were collected from Hashidu reservoir monthly over a period of six months cutting across both dry and rainy seasons. Methodology: Water samples were collected from three locations using 250 ml sampling bottles and was taken to the laboratory for analysis. physicochemical parameters were analyzed using standard water sampling protocols. The water pH and temperature were determined using WTW pH and temperature electrodes. He turbidity meter was calibrated using potassium chloride solution. the turbidity was determined using turbidity meter by pressing the mode button until the arrow appeared as c0n in the displayer. Electrical conductivity was measured using the same Hanna measuring instrument (combo /EC model h198129). Dissolved oxygen was measured with Jenway model 1970 waterproof D.O meter at all the sites. Biochemical oxygen demand (bod) was determined as the difference in dissolved oxygen (do) before and after incubation of the water sample at 20 oc for 5 days. Results: The mean values for physicochemical parameters recorded during dry and rainy seasons are pH (7.42, 6.77), electrical conductivity (353.50 µS/CM, 545.30 µS/CM), DISSOLVED oxygen (6.77 MG/L, 6.00 MG/L), turbidity (3.94 CM, 3.48 CM), temperature (32OC 29.3OC), BOD (3.69 MG/L, 6.00 MG/L) and COD (6.22 MG/L, 6.00 MG/L) respectively. While the mean values the major anions are nitrate (44.00 MG/L, 50 MG/L), phosphate (11.38 MG/L, 17.70 MG/L), sulphate (15.00 MG/L, 25.50 MG/L), chloride (37.23 MG/L, 240.69 MG/L), fluoride (0.028 MG/L, 0.059 MG/L). Conclusion: Most of the parameters were within the limits set by who except pH, temperature and phosphate. there is need for continuous monitoring of water quality parameters for sustainable management of natural resources.
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DOI: 10.9734/ajfar/2025/v27i2885
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