School of Natural Resources and Environmental Studies
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Item Influences of land use/cover on water quality in the upper and middle reaches of River Njoro, Kenya(Blackwell Publishing Asia Pty Ltd, 2007) Muchiri, Mucai; Shivoga, William A.; Kibichi, Samuel; Odanga, Jethro; Miller, Scott N.; Baldyga, Tracy J.; Enanga, Eric M.; Gichaba, Maina C.Item Spatial and seasonal variations in phytoplankton community structure in alkaline–saline Lake Nakuru, Kenya(Blackwell Publishing Asia Pty Ltd, 2009) Mucai, Muchiri; Okoth, Oyoo Elijah; Shivoga, Wiliam A.; Miller, Scott N.; Rasowo, Joseph; Ngugi, Charles ChegeItem Exotic introductions to the fishery of Lake Victoria: What are the management options?(2005) Muchiri, M.; Knaap, M. van; Cowx, I. G.; Waithaka, E.; Njiru, M.Item Shifts in the food of Nile tilapia, Oreochromis niloticus (L.) in Lake Victoria, Kenya(African Journal of Ecology, 2004) Muchiri, M.; Cowx, I. G.; Okeyo-Owuor, J. B.; Njiru, M.Item Macroinvertebrate assemblages along a land-use gradient in the upper River Njoro watershed of Lake Nakuru drainage basin, Kenya(Blackwell Publishing Asia Pty Ltd, 2007) Muchiri, Mucai; Miller, Scott N.; Shivoga, William A.; Kibichii, SamuelItem Organochlorine and organophosphorus pesticide concentrations in water, sediment, and selected organisms in Lake Naivasha (Kenya)(Kluwer Academic Publishers, 2002) Muchiri, Muchai; Gitahi, S. M.; Harper, D. M.; Tole, M. P.; Ng’ang’a, R. N.Item Changes in population characteristics and diet of Nile tilapia Oreochromis niloticus (L.) from Nyanza Gulf of Lake Victoria, Kenya: what are the management options?(Taylor &Francis, 2007-11-26) Muchiri, Muchai; Njiru, M.; Okeyo-Owuor, J. B.; Cowx, I. G.; Knaap, M. van derItem The risk of pathogenic intestinal parasite infections in Kisii Municipality, Kenya(BMC Public Health, 2008-07) Nyarango, Robert, M.; Aloo-Obudho, Peninah; Kabiru, Ephantus, W.; Nyanchongi, Benson, O.Background: Intestinal parasitic infections are among the most common infections worldwide. Various epidemiological studies indicate that the prevalence of intestinal parasites is high especially in developing countries, although in many of these, the environmental risk factors have not been clearly elucidated. The objective of this study was to determine the risk of pathogenic intestinal parasites infections in Kisii Municipality. Methods: Random sampling was used in the selection of the study samples. Stool parasitological profiles of food handlers were done by direct smear and formalin-ethyl acetate sedimentation method. Both vegetable and meat samples were examined for the presence of intestinal parasites. The storage and meat handling practices of the various butcheries were observed. Results: Types of samples examined for occurrence of intestinal parasites includes, a total of 84 vegetable, 440 meat and 168 stool samples. Fifty five (65.5%) vegetable, 334 (75.9%) meat and 69 (41.1%) of the stool samples were found positive for intestinal parasites indicating a high overall risk (66.18%) for intestinal parasite infections. Of the parasites detected, the most common parasites infesting the foodstuffs and infecting the food handlers were Ascaris lumbricoides and Entamoeba histolytica. Parasites were significantly less likely to be present on meat that was refrigerated during display than meat that was displayed at ambient temperature. Conclusion: There is a high risk of infection with intestinal parasites in the sampled Municipal markets. About half of the food handlers surveyed (41.1 %) at the Municipal Hospital had one or more parasitic infections. Furthermore, meat (65.5%) and vegetables (75.9%) sold at the Municipal market were found to be contaminated with parasites hence the inhabitants requires a need for education on food safety, good distribution practices and improvement on sanitary conditions.Item Lake Baringo: Addressing threatened biodiversity and livelihoods(Lakes & Reservoirs: Research & Management, 2006-12) Odada, Eric, O.; Onyando, Japheth, O.; Aloo-Obudho, PeninahLake Baringo is a shallow, internal drainage, freshwater lake located in the Kenyan Rift Valley. The lake is an important source of water for humans and livestock, as well as a significant income source for local communities through activities such as tourism, biodiversity conservation, and fish sold in local markets. The lake has been subject to overfishing, as well as to greatly enhanced sedimentation as a result of land use changes in the drainage basin. This paper provides an analysis of the conditions prevailing at Lake Baringo, and examines in detail the management response to the problems facing the lake. The roles of the many and varied institutions in the lake basin's management are discussed, and an analysis of internationally funded projects designed to ameliorate the situation is provided.Item Metazoan Parasites of Some Commercially Important Fish along the Kenyan Coast(WIOMSA, 2004) Aloo-Obudho, Peninah; Anam, R.O.; Mwangi, J.N.The parasitic fauna of some commercial fish species along the Kenyan coast was investigated at four localities between August 2001 and March 2002. The study was carried out to establish the extent of parasitisation of different fish species and quantify the relationship between the parasites and their fish hosts. Fish samples were collected once a month from four landing beaches. Sixteen fish species were examined out of which only eight were infested with ecto-and endo parasites. The infested fish species included: the rabbitfish (Siganus sutor), the mackerels (Selar crumenophthalmus, Scomberomorus commerson and Rastrelliger kanarguta), parrot fish (Leptoscarus vagiensis), sardine (Sardinella gibbosa), tuna (Thunnus sp.) and needle fish (Hemiramphus far). Of the eight species, Si. sutor was most infested with parasites while Sardinella and Leptoscarus were primarily infested with ectoparasites (isopods). Intensity of infestation increased with age (size), especially in Si. sutor, where very young fish had a low infestation rate, while adults were heavily infested (P < 0.01). No significant differences were observed in the intensity of infestation between sexes in Si. sutor (P > 0.05).