Browsing by Author "Namulawa, V."

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    Common fish diseases and parasites affecting wild and farmed Tilapia and catfish in Central and Western Uganda
    (2014) Walakira, J.; Akoll, P.; Engole, M.; Sserwadda, M.; Nkambo, M.; Namulawa, V.; Kityo, G.; Musimbi, F.; Abaho, I.; Kasigwa, H.; Mbabazi, D.; Kahwa, D.; Naigaga, I.; Birungi, D.; Rutaisire, J.; Majalija, S.
    Intensification of aquaculture production in Uganda is likely to result into disease out-breaks leading to economic losses to commercial fish farms and associated natural aquatic ecosystems. This survey assessed health profiles of selected commercial fish farms and adjacent natural aquatic ecosystemsto identify fish diseases and parasites affecting Nile tilapia (Oreochroms niloticus) and African catfish (Clarias gariepinus) in aquaculture systems in Uganda. Fish farms encounter disease out-breaks that cause low survival rates (0-30%), especially catfish hatcheries. Health management issues are not well understood by fish farmers, with some unable to detect diseased fish. Current control strategies to control aquatic pathogens include use of chemotherapeutants and antibiotics. Bacterial pathogens isolated included Flavobacterium columnare, Aeromonas sp., Edwardsiella sp., Psuedomonus sp., Steptococcus sp., Staphylococcus sp., Proteus sp., and Vibrio sp. A high occurrence of Flavobacterium columnare exists in both asymptomatic and symptomatic fish was observed. Parasites included protozoans (Ichthyopthirius multiphilis, Trichodina sp. and Icthyobodo sp.) and trematodes (Cleidodiscus sp. and Gyrodactylus sp.). Diagnosis and control of diseases and parasites in aquaculture production systems requires adoption of a regional comprehensive biosecurity strategy: the East African (EAC) region unto which this study directly contributes.
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    Morphometric Variation among Bagrus Docmak (Ssemutundu) of the Ugandan major Water Bodies
    (Journal of Fisheries and Aquaculture, 2014) Mwanja, M.T.; Aruho, C.; Namulawa, V.; Ddungu, R.; Ondhoro, C.; Basiita, R.K.
    Bagrus docmak, locally known as Ssemutundu, is one of the native catfishes of Uganda occurring in lakes Albert, Edward, Kyoga and Victoria; and rivers Kagera and the Victoria Nile. The species is a high value food fish that has been targeted for domestication, a process that requires definition of the different strains/taxa of the species. We investigated the morphological variations based on 22 morphological characters in an attempt to identify the different strains of B. docmak and define the species’ morphological phylogenetics in Uganda’s major water bodies. Morphometric data taken from 372 samples was analysed using multivariate methods in an attempt to establish the morphological phylogenetics relationships within and among the different geographical populations. A scatter diagram based on the two most significant components and a multidimensional scaling plot (MDS) based on Euclidean similarity measure clustered the B. docmak from Uganda’s major water bodies into two groups. One group exclusively contained the Victoria Nile individuals whereas the second group contained the rest of the samples. These two groups require further studying for they may require different management approaches and may have different potential aquaculture traits. The findings are discussed in such a way as to emphasise revival, domestication, culture and sustainable exploitation of the Ssemutundu fishery in the country.