• A baseline fish survey and water quality assessment of Butiaba-Wanseko area on Lake Albert

      National Fisheries Resources Research Institute (National Fisheries Resources Research Institute (NaFIRRI)Jinja,Uganda, 2007)
      This report gives the baseline information specifically on water quality (physical/chemical, nutrient and phytoplankton biomass status) of the open part of the lake, a river flowing into the lake and a lagoon, within Butiaba-Wanseko area.Oil and gas exploration in the Albertine Graben are on-going activities by Tullow Oil Plc, and Heritage Oil and Gas (Heritage). Part of the activities involve 2-D TZ seismic surveys in exploration area Block 2 (Butiaba-Wanseko area) in Buliisa District. A study of the transition zone (basically along the shoreline was undertaken by National Fisheries Resources Research Institute (NaFIRRI) on behalf of Environmental Assessment Consult Ltd (EACL) during September 2007. A major objective of the study was to carry out a baseline survey of the fisheries and water quality of the lake shore between Wanseko and Butiaba prior to the proposed 2-D Seisimic investigation.
    • A baseline report of water quality and invertebrate assessment in River Hohwa, Lake Albert: final report

      National Fisheries Resources Research Institute (National Fisheries Resources Research Institute (NaFIRRI)Jinja, Uganda, 2007)
      Tullow Oil plc is to launch an onshore Early Production System (EPS) of oil drilling rated at 4,000 barrels of oil per day by 2009. The location of the EPS is in the Kaiso-Tonya area of Block 2 Oil Exploration Zone along Lake Albert within the Albertine graben. Tullow Oil plc contracted Environmental Resources Management (ERM) Southern Africa (Pty) Ltd in conjunction with Environmental Assessment Consult Limited (EACL) to undertake an Environmental Impact Assessment (EIA) for pre-construction and operation of the proposed EPS. ERM in association with EACL requested National Fisheries Resources Research Institute (NaFIRRI) to conduct a baseline survey of water quality and invertebrates in River Hohwa. This study was requested as part of an earlier baseline survey conducted at the Kaiso-Ngassa spit oil exploration area in Block 2. It was conducted at five selected sites (Fig. 1 & Table 1) within the Hohwa River basin in the Kaiso-Tonya Exploration Area 2. The study was pertinent because the targeted oil wells for EPS are upstream this river which drains the Kaiso-Ngassa valley into Ngassa lagoon.
    • A baseline survey of water quality, invertebrates, fisheries and socioeconomics on Lake Edward for proposed seismic surveys in block 4B : Final report

      National Fisheries Resources Research Institute (National Fisheries Resources Research InstituteJinja, Uganda, 2008)
      The National Fisheries Resources Research Institute (NaFIRRI) on behalf of OPEP Consult Ltd undertook a baseline survey of the transition zone (basically along the shoreline) and near shore habitats of the Uganda apart of Lake Edward and Kazinga channel during December 2007 to January 2008. A major objective of the baseline survey was to generate baseline information on the aquatic ecosystem features related to the fisheries and socio-economics of the fish catch including issues raised by residents in the fish landing sites. Therefore, the baseline survey captured information on water quality, the aquatic invertebrate fauna, aspects of fish biology and ecology, the fish catch including facilities at fish landings, value in the catch and related fisheries socio-economic issues perceived by residents in the settled areas along the shores.
    • A basis for the rational exploitation of the Tilapia esculenta stock of the North Buvuma Island area, Lake Victoria

      Garrod, D.J. (East African Freshwater Fisheries Research OrganizationJinja, Uganda, 1957)
      It is a well established feature of biological systemsthat the constituent organisms are in balance with each other.This is true of a fish population which is in balance with theother organisms of its own ecosystem, and within itself insofaras the numbers of fish entering a fish stock are approximatelyequal to those dying by natural causes.It is also true that 9 as fish grow through the population,they reach a particular size where the increase in weight in a year 9 due to the growth of all the fish in the population of that size, is balanced by the loss of weight due to natural death.The maximum yield of a fishery could thus be obtained by removing all fish as they reach this age. In practice it would require an infinite amount of fishing to accomplish this 9 and it is generalpractice in fishery management to begin cropping fish just before they reach this ideal size and age.
    • A brief report on a survey of the fish and fisheries of the Tana river, with special reference to the probable effects of the proposed barrages

      Mann, M.J. (East African Freshwater Fisheries Research OrganizationJinja, Uganda, 1969)
      The construction of several barrages in order to develop the hydroelectric and irrigation potential of the Tana river has been proposed and the probable effects of these developments upon the fish and fisheries of the area' has been investigated. Briefly in the highest reaches the sport fishery will be unaffected, in the middle reaches the sparse subsistence fisheries will be only slightlyinconvenienced but in the terminal reaches of the river the subsistence and commercial fishing enterprises are expected to be seriously reduced by the progressive re-regulation of river-flow. However each new dam will support a new and productive reservoir fishery and with proper development the annual yield of fish from the Tana basin is expected to increase considerably.
    • A collection of fishes from the Aswa river drainage system, Uganda

      Greenwood, P.H. (1963)
      The collection described below was made in April 1960 by the Uganda Game and Fisheries Department, and came from tributaries of the upper Aswa river about 20 miles north of Soroti. The Aswa rises on high ground in the western region of Karamoja and joins the Nile about 30 miles north of Nimule. For part of its course the river flows close to Lake Kyoga and some of its tributaries in this area arise near streams draining into Kyoga. Thus, it is an area of some zoogeographical interest since, like Lake Albert, it can be looked upon as an incursion of the Nile into a zone characterized by the large number of endemic or geographically restricted species occurring in bodies of water isolated both from one another and from the Nile.
    • A comparison of certain aspects of the biology of Lates niloticus (Linne) in some East African lakes

      Gee, J.M. (1969)
      Lates niloticus nile perch occurs naturally in only two East African lakes L. Albert and L. Rudolf but Foss Record indicate a wider East African distribution in the past fossils of the genus Lates are found in the Miocene beds of Lake Victoria basin.
    • A contribution to the study of Lates niloticus, Nile perch, in Lake Chad

      Tobor, J.G. (Federal Ministry of InformationLagos, Nigeria, 1974)
      Lales niloticus, the Nile perch, supports an economically important gillnet fishery in Lake Chad where it contributes from 35 to 45 per cent by weight of commercial landings at Malamfatori on the North-Western shore of the Lake. The present study examin s changes in the size distribution of Lates niloticus and variation in its catch rate expressed as catch kg/lOO m2 net/night fishing from the inshore to about 20-mile offshore waters of the lake at Malamfatori. Some meristic and morphometric characters of the fish have also been examined as a contribution to its racial characteristics.
    • A new genus and species of cat-fish (Pisces, Clariidae) from the deeper waters of Lake Victoria, May 1958

      Greenwood, P. H. (1958-05)
      Recently three specimens of an undescribed clariid fish were caught in the deeper waters of Lake Victoria. In all superficial characters the species could be referred to the genus Olarias (sub-genus Olarias) and to the species group Olarias werneri Blgr., C. alluaudi Blgr., C. eupogonNorman. However, closer study showed that the suprabranchialrespiratory organism were virtually absent and the suprabranchial chamber almost non-existent. Since the fishes were adult and of a size at which related Clarias species possess well-developed suprabranchial organs, itmust be concluded that this is the definitive condition for the species.
    • A new water weed, giant salvinia (Salvinia molesta), invades Lake Kyoga

      Wanda, F.M.; Balirwa, J.S.; Ogwanga, J.A; Moro, R.; Amondito, B. (National Fisheries Resources Research InstituteJinja, Uganda, 2015)
      Giant salvinia (Salvinia molesta) is an introduced invasivewater weed in the tropics and subtropics It is a free floating weed that grows rapidly and forms extensive dense mats over still or slow moving waters.
    • A note on a second survey of the fisheries of the Tana river, Kenya

      Mann, M.J. (East African Freshwater Fisheries Research OrganizationJinja, Uganda, 1967)
      A preliminary report upon a survey of the fisheries of the Tana River,Kenya undertaken during the dry season, August-September 1965, wasissued in September the same year (Mann 1965), and a shortened accountwas subsequently published (Mann 1966). However during 1967 the survey,which had been interrupted, was resumed and a second visit was made tothe area during the wet season of April-May
    • A note on length frequency and "species group" composition of Haplochromis populations in lake Victoria

      Gee, J.M. (East African Freshwater Fisheries Research OrganizationJinja, Uganda, 1965)
      During the preliminary part of a survey on Haplochromis in a small area of Lake Victoria off Entebbe some interesting information was collected on the composition of the Haplochromis populations. Because of the complex nature of the taxonomy it is very difficult to divide the genus Haplochromis into all its species when working in the field. Certain broad types however can usually be recognized and the genus has been classified into eighteen "species-groups" comprising eight groups of predators and ten groups of non-predators.
    • A note on Lernaea bistricornis Harding, a parasitic Copepod from Lake Tanganyika, 1958.

      Fryer, G.; East African Fisheries Research Organisation (East African Fisheries Research OrganisationJinja, Uganda, 1958-12-29)
      The parasitic Copepod Lernaea bistricornis Harding was described by Harding (1950) from a single specimen found in Lake Tanganyika on the endemic Cichlid fish Cardio pharynx schoutedeni POLL. No further specimens were known until when several individuals were collected in the same lake by Dr. G. MARLIER from the endemic Cichlid fishes Cyathopharynx Furcifer (Boulenger) and Callochromis pleurospilus (Boulenger). These records indicate that L. bistricornis has fairly wide host preferences, at least within the fainily Cichlidae, and suggest that, like its relative L. lophaira Harding which parasitizes the Cichlid fishes of L. Nyasa, it is capable of parasitizing any member of this group within its range of distribution.
    • A note on some of the major parasites of Bagrus docmoc (Forskahl) from Lake Victoria

      Mbahinzireki, G. (Uganda Freshwater Fisheries Research OrganizationJinja, Uganda, 1977)
      Although the Biology of Bagrus docmac of Lake Victoria and its associated rivers is fairly known, comparatively little information appears to have been published on the major parasites and their effect on growth rate and morality of this commercially important species.
    • A note on some physico-chemical features of river Nzoia

      Bugenyi, F.M.W (UFFROJinja, Uganda, 1977)
      Preliminary analyses for some of the major physicochemicalfeatures of River Nzoia, in Western Kenya, effluent to LakeVictoria are given. Some fear is expressed concerning the possible chemical, physical and consequently biological pollution from the effluents of a paper factory situated along the course of the river.
    • A note on stock parameters: mortality and growth

      Twongo, T.; Hartsuiiker, L. (Agricultural development project fishery surveyJinja, Uganda, 1991)
      The Kyoga fisheries has been over-exploiting the stocks ofboth major species by means of harmful fishing gears. Sincethere has been some success in the removal of gears such asseines, cast nets and small-meshed gillnets from the lake, itis of interest to know how rapidly the fish stocks would beable to recover and provide better yields.
    • A note on the breeding biology of Aplocheilichthys pumilus (Boulenger)

      Welcomme, R.L. (East African Freshwater Fisheries Research OrganizationJinja, Uganda, 1966)
      Aplocheilichthys pumilus is a small cyprinodont commonly found in shallowswampy areas around Lake Victoria. In the lagoons the species was especiallycommon in the shallow grass swamps and in the slightly deeper water amongst stands of Typha and Cyperus flanking the main lagoon.
    • A PCSR model to improve performance of the fish commodity system

      Odongkara, K. (1992)
      There is now, more than ever before, a growing demand in this country for research to be directed towards the development programmes of the country. Researchers have come under increasing pressure to relate their work to specific development problems and design their investigations to produce results which will be applicable in addressing these problems. The Fish Commodity Systems Economics (U) Project is an attempt to strengthen the focus of studies at UFFRO and elsewhere within the fish system towards the problems of the fish commodity sub-sector in Uganda in order to formulate measures which will improve the performance of the sub-sector in alleviating some of the nation's socio-economic problems
    • A pilot family-operated fish cage project in Lake Kyoga

      Manacop, P.R.; Sprowles, L.J.; Mukiibi, Deo (Agricultural Development Project Fishery Survey UnitJinja, Uganda, 1988)
      The culture of fish in cage and pen is a comparatively new project in Uganda although it has been successfully practiced commercially in the Philippines in the raising of Tilapia and carps. As a technology transfer scheme the project is being proposed as an alternative employment both for fishermen and farmers in the rural and fishing communities around the Lake Kyoga Complex. The project can be operated as family enterprise, by cooperatives or by fishery corporations, as possible income-producing business ventures.
    • A possible effect of obligatory parthenogenesis on the flight activity of some tropical larvo-aquatic insects

      Tjønneland, Audfinn (Norwegian Universities PressBergen, 1970)
      It is suggested that obligatory parthenogenesis may lead to a "decay" of the flight activity patterns in tropical species of Trichoptera and Ephemeroptera. Most species of Trichoptera and Ephemeroptera at Jinja, Uganda, fly between Sunset and sunrise. CORBET and TJ0NNELAND (1955) and TJ0NNELAND (1960) have shown that, with a few exceptions, these species have their flight activity peaks at twilight. Some species are eocrepuscular, showing a bimodal activity pattern, while others fly only at dusk or at dawn. Common to most species studied is that the periods of flight activity, as judged by the catches in light traps, are very restricted in time.