Browsing by Author "Humphrey, Agevi"
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Publication Effects of Sand-Harvesting on River Water Quality and Riparian Soil Physico-Chemical Properties(Scientific Research, 2022) Lwanga, Aquila; Tsingalia, Mugatsia; Humphrey, Agevi; Shilenje, Zablon W.he widespread distribution of river sand-harvesting activities continues to degrade river water quality and the surrounding riverine environments. This study determined practical effects of sand-harvesting on two rivers in Kakamega County Kenya. Water samples were tested for turbidity and total suspended solids (TSS). For riparian soils, nitrogen (N), phosphorus (P), pH, organic carbon (OC), moisture content and textural class were determined on composite samples obtained from the field. Two control sites not affected by sand-harvesting were also used for comparison. Results indicate TSS concentrations increased during the rainy season when sand-harvesting was occurring, with significant differences between the control and sand-harvesting sample groups. Between seasons—dry and wet—in natural circumstances, the riparian soil moisture and phosphorus contents increased significantly. The study shows that river sand-harvesting degrades the aesthetic value of riparian areas, and makes rivers prone to bank erosion, and silt. This increases river water turbidity. The study concludes that sand-harvesting does not directly affect the riparian soil moisture content, total N, P, pH, OC or textural class, but reduces productivity of riparian land and puts the riverine ecosystems at risk.Publication STUDY OF TOXIC EFFECT OF MONOCROTOPHOS 36% E.C ON THE BIOCHEMICAL CHANGES IN FRESH WATER FISH CATLA CATLA (HAMILTON, 1882)(juniper publishers, 2017-05-30) Tamizhazhagan, V.; Pugazhendy, K.; Sakthidasan, V; Jayanthic; Sawicka, Barbara; Humphrey, Agevi; C, Vasanth; Kasinathan, M; M Baranitharan Ph D, DrThis study was undertaken to find out the Catla catlafresh water fish biochemical changes in the fish muscles, liver, and kidney. Toxicity were calculated probit analysis, The total carbohydrate contented was estimated by the technique of Roe , Protein was estimated by Lowry method and total lipids were estimated by the method of floch methods. The results shown on total carbohydrate level in muscle 6.43 mg/g after treatment 2.70 mg/g, liver carbohydrate control 17.55mg/g after treatment 16.10 mg/g changes accrued 7.41 %and kidney carbohydrate control 1.44mg/g after treatment 0.53mg/g was gradually decreased. Then total protein in muscles23.20 mg/g after sublethal concentration at 96 hours treated 17.80mg/g decreased and liver protein 23.12mg/g treated fish 19.40 mg/g changes accrued 13.58% kidney protein level 9.60 mg/g after treatment in sublethal concentration in 96 hours 6.24 mg /g were decreased and Total lipid level are in muscles 1.78mg/g after 96 hours 0.89mg/g liver lipid 7.10 mg/g after treatment 4.35mg/g then kidney 2.09mg/g 0.92 mg/g simultaneous gradually decreased muscles, liver and kidney. The Monocrotophos affects not only fishes but also organisms in the food chain through the procedure of expenditure of one by the other those human begins affected various genetic disorders absolutely insecticides.