Fish productivity of ado-ekiti water reservoir in relation to physicochemical characteristics and mopho-edaphic index
Edward J.B., Idowu, E.O., Oso J.A., Kadri M.I.
A study on the physicochemical parameters of Ureje Reservoir, Ado-Ekiti was used to estimate the potential fish yield of the reservoir using the Morpoedaphic Index (MEI). Physicochemical characteristics of the water body were sampled monthly from October - December 2011. The results showed variations in the physicochemical parameters at different sampling stations in the reservoir. The temperature ranged from 24.8–29.4 °C, pH ranged from 6.20-8.42, alkalinity ranged from 28.24–39.25 mg/CaCO3/L, dissolved oxygen ranged from 5.10–11.24 mg/L, transparency ranged from 0.06–1.18 m, conductivity ranged from 722.30–972.2 µs, phosphate ranged from 64.08–79.60 mg/L, nitrate ranged from 18.10–22.10 mg/L, TDS ranged from 0.30–0.70 mg/L and TSS ranged from 0.04-0.08. Estimation of the potential fish yield gave an estimate of 112.59 kg/ha. This estimation was higher than other small shallower and larger African reservoirs. The mean values of physical-chemical parameters obtained in the reservoir were well below the recommended permissible limits by WHO for drinking water. Thus, the water could be regarded as safe for drinking after normal treatment. There should also be regular monitoring and adoption of effective management techniques to enhance sustainable use of the reservoir’s fishery resources.