Fish Abundance and Socio-Economic Aspects of Lake Jipe Fisheries, Kenya/Tanzania Border

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Addis Ababa Universty


Lake Jipe is a lake that is shared by two countries, Kenya and Tanzania, and is one of the water bodies where both human and natural activities have had great impacts both on the fish and fisheries. This study was aimed at identifying all the fish species found in the lake, detelmining the relative abundance of each of the species at selected sites and to assess the socio-economic aspects of fisheries in the lake. Fish sampling was done using gill nets of size 20 - 60 mm and fish identified to give a species inventory of the lake. Relative abundance was estimated using Catch Per Unit Effort (CPUE). A questionnaire was used to gather information on the socio-economic aspects. Nine species were identified from the lake. Catch Per Unit Effort (CPUE) showed that the introduced Oreochromis esclilelltlls was the most abundant in both seasons and also in all the sites, both in numbers and weights. Analysis of Yariance (ANOY A) indicated a significant difference in weight of specimens between the two seasons. The length-weight relationship for Bm·bus. Paludinosus, 0. esclIlentlts and O. jipe, which were the most common species in the lake, were found to be cnrvilinear. The mean seasonal Fulton condition factor was 2.0, 2.1, 1.3 and 0.9 for 0. jipe, 0. esculelltlls, B. paludilloSIlS and R. tangensis, respectively. There were no significant differences in the water parameters between the sampling sites, but there were significant differences for BOD, electrical conductivity and temperature between seasons. Gill nets were the most commonly used fishing gear by the local fishermen and a mesh size of 30mm was most pre felTed. Fish caught by the fishermen were both for commercial and subsistence purposes. Fish preservation methods included smoking and sun drying. This study realized that the challenges facing Lake Jipe are a complex mixture of socio-economic and ecological factors some of which include increased siltation, decreasing water quality and quantity, shrinking fishery, advancing water plants, agricultural expansion and expanding itTigation. KEYWORDS: Lake Jipe fisheries, Relative abundance, Socio-economic aspects, Kenya/Tanzania border



Lake Jipe fisheries, Relative abundance, Socio-economic aspects, Kenya/Tanzania border