Recent Submissions

  • Description and analysis of the value chain of the Lake Victoria Nile perch fishery May-July 2008. Consultancy report no. 42

    Pollard, I. (MRAG LtdLondon, 2008-07)
    The study 'Value chain analysis of the Lake Victoria Nile perch fishery' was undertaken as part of the EC-funded 'Implementation of Fisheries Management Plan (IFMP) project', as requested by the Lake Victoria Fisheries Organisation (LVFO) Council of Ministers in 2007. The purpose of the study is to determine the value and share of benefits from this value along the whole commodity chain of Nile perch, from capture to consumption in the export markets of Europe. The project has been conducted over May to July 2008 and comprises two parts; a) an investigation of European Nile Perch marketing; and b) a survey of exporters in Uganda, Tanzania and Kenya. The full TORs are attached in Annex 1. Itinerary in Annex 2 needed revision upon arrival in each EAC country to confirm visits and more accurate plan the logistics. Annex 3 plus appendices provide the value chain analysis proper. This study is not being conducted in isolation and shares data as well as findings with ISTTA studies currently being undertaken, in particular the IFMP Agents Study (Lwenya et aI., Luomba, Odongkara et al.), the RSTTA Study on sustainable financing of BMUs (Kazoora et al), the LVFO Business Plan (Macfadyen) and the Functional Analysis study (Peacock). This study was deemed necessary because despite the impressive benefits from the Nile perch fishery, there is an image of this fishery which is very negative and potentially harmful to future investment and support. As well as the ecological damage, there have been repeated complaints, especially in the media, that the wealth from this fishery is unfairly distributed and that poor fishermen are exploited by rich, foreign factory owners. These complaints reveal a lack of understanding of the distribution of benefits derived from the fishery. Although draft reports were received from Luomba, Lwenya, Odongkara and Macfadyen, the Functional Analysis and cost-benefit analysis were not available and have not been included in this study.
  • Technical report on the environmental monitoring of the cage area at the Source of the Nile (SON) Fish Farm for Quarter 4: October – December 2017

    Egessa, R.; Nankabirwa, A.; Namulemo, G.; Kizza, P.; Ocaya, H.; Kiggundu, V.; Nsega, M.; Pabire Ghandi, W.; Naluwairo, J.; Magezi, G.; et al. (National Fisheries Resources Research Institute (NaFIRRI)Jinja, Uganda, 2017)
    The monitoring of water quality and biotic communities at Source of the Nile (SON) fish farm area, for quarter 4 (October – December) was undertaken in December 2017. The activity aimed at assessing possible changes in the water environment at SON cage area. The following parameters were assessed: water physico-chemicals and nutrients, algae, zooplankton, benthic macro invertebrates, and fish communities. Total depth was above 5.0 m (range: 5.63 – 9.74 m) at all sampled points and decreased towards the downstream of cages. Water transparency ranged from 1.26 – 1.48 in the cage area and 1.08 to 1.34 m away from the cages. Within the cage area, Dissolved Oxygen ranged from 5.7 – 6.4 mg/L at the surface, and 5.1 – 6.4 mg/L at the bottom, while in the non-cage areas, the range was 5.5 – 7.5 mg/L at the surface and 2.6 – 7.0 mg/L at the bottom. Temperature ranged from 27.0 – 28.0 o C at the surface and 25.5 – 27.5 o C at the bottom waters for all sites, and were within the optimal range (25 – 32 o C). pH in both surface and bottom waters was above 7.0 (range: 7.5 – 9.2) at all sites. Conductivity within cage area ranged from 100.5 – 102.6 μScm-1 in surface water and 101.8 – 112.1 μScm-1 in bottom water. In the non-cage areas conductivity ranged from 11.0 – 104.4 μScm-1 in surface water and 100.2 – 110.0 μScm-1 at the bottom. Ammonium nitrogen concentration during December was less than 0.02 mg/L at all sites (0.007 – 0.018 mg/L within the cage sites, and 0.012 – 0.019 mg/L in the non-cage sites). Nitrite nitrogen ranged from 0.002 – 0.169 mg/L in the cage area, and 0.003 – 0.057 mg/L in the non-cage areas. Similar to previous records of June and September 2017, nitrate nitrogen concentration generally increased towards the downstream site, being lowest at RPT (0.041 mg/L) and highest at DSC (0.204 mg/L). Soluble reactive phosphorus was less than 0.005 mg/L at all sites, and varied within narrow margin (range: 0.003 – 0.0048 mg/L in cage sites, and 0.0032 – 0.0047 mg/L in non-cage sites). The TP concentration ranged from 0.085 – 0.107 mg/L in the cages, and 0.090 – 0.118 mg/L in the non-cage sites and was higher than recorded in September (0.038 – 0.044 mg/L in the cages and 0.04 to 0.109 mg/L away from cages). Total nitrogen concentration was in the range of 0.138 – 0.553 mg/L within cage area and 0.421 – 0.513 mg/L in non-cage areas. The concentration of TSS ranged from 0.76 – 4.33 mg/L in the cage area and 0.57 – 2.76 mg/L in the non-cage areas. The phytoplankton community was composed of blue-green algae, green algae and diatoms, dominated by blue-green algae. The abundance of algae was higher in the non-cage areas (mean:7.20 ± 2.14 mm3L-1, Range: 5.15 – 10.20 mm3L-1) than recorded in the cage areas (mean: 6.0 ± 0.71 mm3L-1, Range: 5.30 – 6.98 mm3L-1), similar to observations of September 2017 (< 5 mm3L1 within the cages and >5.6 mm3L-1 in the non-cage sites). At all sampled points, blue-green algae contributed >70% of total abundance. Total zooplankton abundance ranged from 982,213 – 1,310,830 ind.m-2 in the non-cage sites, and 740,601 – 1,503,130 ind.m-2 in the cage areas. Similar to observations of September 2017, the upper cage site (WIC3 and WIC4) presented lower zooplankton abundance (mean: 788,954 ± 68,381 ind.m-2) when compared to the lower cage site with mean abundance of 1,128,232 ± 530,186 ind.m-2. Like in the previous sampling periods, copepods were the numerically dominant group (92.69 – 97.22 % of total zooplankton abundance) at all sampled points, with no major differences between cage and non-cage areas. The high abundance of copepods was attributed to the abundance of the juvenile stages (copepodites and Nauplius larvae) which contributed 83.72 – 92.78% of the total zooplankton abundance and this was mainly due to the Nauplius larvae (66.4 – 83.2 %). Cladocera relative abundance ranged from 0.32 – 3.98% while that of rotifers ranged from 1.55 – 3.74%. The macro-benthic community comprised molluscs, annelids and arthropods. Taxa richness ranged from 5 – 11 taxa in the cage area, and 7 – 9 taxa in the non-cage areas. The abundance of benthic invertebrates within the cage area ranged from 1,134 – 2,416 ind.m-2 and this was higher than previously recorded in September (294 – 1,415 ind.m-2). In the non-cage sites abundance was in the range of 420 – 3,992 ind.m-2. Oligochaete annelids which are reported to be very tolerant to pollution contributed 0 - 28 % of the abundance of benthos at cage sites and 3 - 20% at the non-cage sites. Diptera made the greatest contribution at almost all sites, with the percent abundance being higher in non-cage sites (40 – 86%) than what was recorded in the cage sites (37 – 82%). Chironomus spp. and Chaoborus sp. were the main contributors to the observed Diptera abundance at all sites. Six fish species, including haplochromines (Nkejje) as a single species group, were recorded in the vicinity of the cages during December 2017. Five fish species were recorded from upstream the cage site, four species from within cage area, and two species from downstream the cages. Overall mean catch rates were 1.8 fish/net/night and 148.6g/net/night compared to 1.7 fish/net/night and 175.4g/net/night recorded in September 2017. By weight, catch rates in December 2017 were highest upstream the cage site (312.1g/net/night) and also by numbers (3.1 fish/net/night). Four species of haplochromines were recorded in the vicinity of the cages during the survey of December 2017 compared to six species recorded in September 2017. The overall catch rate for the haplochromines, in December 2017 was 1.7fish/net/night and 27.5g/net/night compared to 3.4 fish/net/night and 62.3g/net/night recorded in the previous survey of September 2017. Among the fish species examined during December 2017 survey, most of the haplochromine cichlids (88.9%) were mature but only 50% breeding. Only one specimen of L. niloticus was mature and breeding. All S. afrofischeri and S. victoriae specimens examined were mature and in breeding condition while M. kannume was immature. The diet of fishes encountered comprised mostly of fish and insects, which are known natural foods of the fish species. Infection by fish parasites during the survey of December 2017 was not noticed in any fish recorded from the experimental gillnets. The overall observation on concentrations of nutrients, levels of physico-chemical variables, and biotic communities indicated minimal impact of cages on water quality. The farm should therefore continue adhering to the best environmentally sustainable aquaculture practices, especially continuing with fallowing or rotation of cages to allow resident organisms maintain their natural population densities, distribution and community structure in the area; reducing excess uneaten feed and other suspended materials which would impact on nutrient status and biota; as well as wise use of any chemicals in the area.
  • Technical report on the environmental monitoring of the cage area at the Source of the Nile (SON) Fish Farm for Quarter 2: April-June 2017

    Egessa, R.; Nankabirwa, A.; Namulemo, G.; Kizza, P.; Ocaya, H.; Kiggundu, V.; Nsega, M.; Pabire Ghandi, W.; Naluwairo, J.; Magezi, G. (National Fisheries Resources Research Institute (NaFIRRI)Jinja, Uganda, 2017)
    National Fisheries Resources Research Institute (NaFIRRI) undertakes quarterly monitoring of the water environment at Source of the Nile (SON) fish farm. The activity which is through a collaborative arrangement between SON fish farm and NaFIRRI aims at assessing possible changes in the water environment at SON cage area. The fish rearing activity at SON fish farm involves keeping fish in cages often under high stocking densities and feeding them on artificial feeds that are not the natural food eaten by wild fish. Cages being open systems means that all wastes such as faeces, uneaten feed and fish excretes such as ammonia are shed into the water column (Fernandes et al., 2001). The consequence is increased nutrient input which may result into high algal growth (bloom). Although this may mean more food available to primary consumers such as zooplankton, blooms caused by blue-green algae may be harmful as certain species are associated with production of toxins. In addition, the degradation of excessive phytoplankton biomass can lead to anoxic conditions in sediments underlying the cages thus changing the abundance and composition of the resident fauna. Napoleon Gulf being a shallow bay at the exit of River Nile from Lake Victoria harbours a wide variety of wild fish species that are cherished by riparian human populations. The wild fishes living close to cages are bound to be affected by activities associated with this method of fish farming. Cage farming is likely to affect the presence, abundance, diet and residence time of organisms in given vicinity (Carss, 1990; Dempster et al., 2002). Floating structures including cages may act as Fish Attracting Devices (FADs) and most pelagic fishes are known to be strongly attracted to floating objects (Freon and Dagorn, 2000; Castro et al., 2002). Wild fish could be attracted to these sites by for example plenty of food available to the cultured fishes (Bjordal & Skar, 1992). In the process, other ecological interactions between cultured and wild fish may be possible. Wild fish may also be instrumental in cleaning the environment close to the cages through eating any excess uneaten food left by cultured fishes. Caged fish under crowded conditions is susceptible to waterborne diseases and could infect wild fish or vice versa. While diseases breaking out among cultured fishes may be controlled through treatment, the wild fishes cannot undergo treatment and may thus spread diseases to other fishes, hence affecting yields from capture fishery. Furthermore, escape of cultured fish may cause genetic dilution hence decreasing genetic diversity of fish. These and other possible impacts of cages on the water environment may consequently result into conflicts 2 with other resource users especially due to deteriorating water quality and effect on wild fishes, consequently affecting the cage aquaculture industry. Therefore, the following were established as key parameters to be monitored: water temperature, dissolved oxygen, pH, conductivity, water transparency, total suspended solids, nutrient status, algae, zooplankton, benthic macro invertebrates and fish communities. The present report presents field observations made at the two cage sites of Source of the Nile fish farm including upstream, downstream and reference points, for the second quarter (April to June) undertaken in June 2017. The report provides a scientific interpretation and discussion of the results with reference to possible impacts of the cage facilities on the water environment and the different aquatic biota in and around the fish cage site.
  • Status of kariba weed (Salvinia molesta) infestation, its impacts and control options on Uganda’s water systems

    Wanda, F.M.; Matuha, M.; Amondito, B. (National Fisheries Resources Research Institute (NaFIRRI)Jinja, Uganda, 2016)
    Kariba weed (Salvinia molesta) is an invasive alien waterweedthat was first recorded in Uganda in sheltered bays of LakeKyoga in June 2013. This waterweed has become a commonfeature on Lake Kyoga and its associated rivers, streams andswamps, and has spread to other lakes notably Kwania and Albert in addition to Lake Kimira in Bugiri district.
  • Mushroom growing as a livelihood option to fishing among Lake Edward fisher communities

    Bwambale, M.; Lwandasa, H.; Odongkara, K.; Nasuuna, A.; Akumu, J.; Okura, R.; Namanya, D. (National Fisheries Resources Research Institute (NaFIRRI)Jinja, Uganda, 2016)
    Fisheries activities are the main source of livelihood for the communities that live at Lake Edward fish landing sites. The landing sites include: Kazinga, Katwe, Kayanja, Kishenyi Rwenshama and Katunguru and are located within Queen Elizabeth Conservation Area (QECA).In spite of being the main source of livelihood, 74% of therespondents in a 2013 survey reported that catches forthe main targeted fish species namely: Bagrus docmak(Semutundu), Oreochromis niloticus (Tilapia) and Protopterusaethiopicus (Mamba) were declining due to overfishingand catching of immature fish by the rapidly increasingpopulation. Lake Edward Frame surveys had shown that thenumber of fishing crafts increased from 302 in 2008 to 330 in 2011, while the number of fishers increased from 355 to 600 during the same period. Between 2008 and 2010, catch perboat, for Bagrus docmak (Semutundu) declined from 5.25kg to 4.04 kg and for Protopterus aethiopicus (Mamba) from2.63 kg to 1.03kg.It has been suggested that reducing pressure on the lakeshould be handled using different approaches, one of whichis introduction of programs for enhancing livelihood optionswhich do not conflict with conservation of Queen ElizabethConservation Area (QECA). The main goal of this study wastherefore to identify, prioritize and pilot livelihood options at selected landing sites of Lakes Edward and George.
  • Fishing effort and fish yield over a 15 year period on Lake Victoria, Uganda: management implications

    Nakiyende, H.; Mbabazi, D.; Balirwa, J.S.; Bassa, S.; Muhumuza, E.; Mpomwenda, V.; Mangeni, S.R.; Mulowoza, A.; Mudondo, P.; Nansereko, F.; et al. (National Fisheries Resources Research Institute (NaFIRRI)Jinja, Uganda, 2016)
    The National Fisheries Resources Research Institute (NaFIRRI), the Directorate of Fisheries Resources (DiFR), the Local Government fisheries staff and those from the Beach Management Units (BMUs) of the riparian districts to Lake Victoria regularly and jointly conduct Frame and Catch Assessment Surveys. The information obtained is used to guide fisheries management and development. We reveal the trends in the commercial fish catch landings and fishing effort on the Uganda side of Lake Victoria, over a 15 year period (2000-2015) and provide the underlying factors to the observed changes. The contribution of the high value large size species (Nile perch and Tilapia) to the commercial catch of Lake Victoria has significantly reduced while that of the low value small size species, Mukene has increased over a ten year (2005-2015)period. The information is intended to update and sensitize the key stakeholders on the status of the Lake Victoria fisheries. In addition, the information provided is expected to guide policy formulation and management planning by the fisheries managers at all levels including the BMUs and Landing Site Management Committees (LSMCs), the Local government fisheries staff and the Directorate of Fisheries Resources. The information is anticipated to create awareness among the lakeside fisher communities to reverse the current trend in fish declines.
  • Evaluation of approaches to estimate fish catches on Lake Victoria: a case study using CAS and frame data from Uganda

    Nakiyende, H. (United Nations University, Fisheries Training Programme, 2014)
    Since 2005, harmonized catch assessment surveys (CASs) have been implemented on Lake Victoria in the three riparian countries Uganda, Kenya, and Tanzania to monitor the commercial fish stocks and provide their management advice. The regionally harmonized standard operating procedures for CASs have not been wholly followed due to logistical difficulties. Yet the new approaches adopted have not been documented. This study investigated the alternative approaches used to estimate fish catches on the lake with the aim of determining the most reliable one for providing management advice and also the effect of current sampling routine on the precision of catch estimates provided. The study found the currently used lake-wide approach less reliable and more biased in providing catch estimates compared to the district based approach. Noticeable differences were detected in catch estimates between different months of the year. The study recommends future analyses of CAS data collected on the lake to follow the district based approach. Future CASs should also consider seasonal variations in the sampling design by providing for replication of sampling. The SOPs need updating to document the procedures that deviate from the original sampling design.
  • An examination of the usefulness of single-species biomass models for the management of Lake Victoria fisheries

    Nakiyende, H. (United Nations University, Fisheries Training Programme, 2014)
    Nile perch (Lates niloticus), tilapia (Oreochromis spp), dagaa (Rastrineobola argentea, silver cyprinid), and haplochromines (Tribe Haplochromini) form the backbone of the commercial fishery on Lake Victoria. These fish stocks account for about 70% of the total catch in the three riparian states Uganda, Kenya, and Tanzania. The lake fisheries have been poorly managed, in part due to inadequate scientific analysis and management advice. The overall objective of this project was to model the stocks of the commercial fisheries of Lake Victoria with the view of determining reference points and current stock status. The Schaefer biomass model was fitted to available data for each stock (starting in the 1960s or later) in the form of landings, catch per unit effort, acoustic survey indices, and trawl survey indices. In most cases, the Schaefer model did not fit all data components very well, but attempts were made to find the best model for each stock. When the model was fitted to the Nile perch data starting from 1996, the estimated current biomass is 654 kt (95% CI 466–763); below the optimum of 692 kt and current harvest rate is 38% (33–73%), close to the optimum of 35%. At best, these can be used as tentative guidelines for the management of these fisheries. The results indicate that there have been strong multispecies interactions in the lake ecosystem. The findings from our study can be used as a baseline reference for future studies using more complex models, which could take these multispecies interactions into account.
  • Promotion of use of lift nets in harvesting mukene (Rastrineobola argentea) in Uganda

    Ministry of Agriculture, Animal Industry and Fisheries. Department of Fisheries Resources (Department of Fisheries ResourcesEntebbe, Uganda, 2005)
  • Socio-economic conditions and challenges of Kyoga lakes fisheries

    National Fisheries Resources Research Institute. Socio-Economics Unit (National Fisheries Resources Research Institute (NaFIRRI)Jinja, Uganda, 2011)
    Over the period 2008 to 2010, NaFIRRI carried out a number of socio-economic studies on the Kyoga lakes to provide an update of the socio-economic conditions of the fisheries and also to address specific areas of fisheries socio-economic issues and development concerns. The data collection was conducted using Key informant interviews, questionnaire sample surveys, Focus Group Discussions, secondary data searches and field observations. The objective of this fact sheet is, therefore, to provide key information from these studies for use at national, district, community levels as well as by other interested stakeholders.
  • Aspects of the fishery and biology of the African catfish Clarias gariepinus (Burchell, 1822) amidst environmental changes in Lake Wamala (Uganda)

    Olokotum, M. (Makerere University, Biological Sciences, 2015)
    Environmental changes are some of the factors that affect fisheries and biological characteristics of fishes. The African catfish Clarias gariepinus (Burchell, 1822) has biological characteristics that enable it to persist under various stressful environmental conditions. However, few studies have examined how the African catfish responds to conditions created by a changing climate. The study examined some of the fishery and biological characteristics of African catfish in Lake Wamala (Uganda) to provide an understanding of their response to changing climatic conditions using data for the period 1950 - 2013. Temperature around the lake increased by 0.02ºC/year since 1980, commensurate with the regional trend, while rainfall was above average since 1996, except in 2004 and 2008. Lake depth was strongly positively correlated with rainfall (r =0.83, n= 6, p<0.05) up to 2000, after which, lake depth decreased amidst increase in rainfall. The contribution of African catfish increased from 20% to 85% and 17% to 78% respectively to commercial and experimental catches respectively between 1975 and 2013 despite the decrease in lake depth. The modal total length, condition factor, food, and fecundity did not change. Only size at first maturity decreased from 37.5 to 30 cm TL in females and 39.5 to 34.2 cm TL in males between 1999/2000 and 2012/2013. The biological characteristics of the African catfish were comparable with those of the same species in other lakes and remained relatively stable. The results suggested that the African catfish has the capacity to persist and/or adjust appropriately under conditions created by climate variability and change, and if properly managed, can sustain the fisheries of Lake Wamala.
  • Changes in catches and biological characteristics of Nile tilapia (Oreochromis niloticus Linnaeus) in Lake Wamala (Uganda) under changing climatic conditions

    Natugonza, V. (Makerere University, Biological Sciences, 2015)
    There have been changes in catches and biological characteristics of the Nile Tilapia,Oreochromis niloticus (Linnaeus) in Lake Wamala (Uganda) since its introduction andestablishment, but the factors which have contributed to these changes are not adequatelyunderstood. This study examined changes in catches and biological characteristics of Nile tilapiain relation to changes in temperature, rainfall and lake depth to provide an understanding of the role of changing climatic conditions. There was an increase in minimum, maximum and average temperature since 1980, but only minimum (0.021ºCyr-1) and average (0.018ºCyr-1) showed a significant trend (p < 0.05). Rainfall increased by 8.25 mmyr-1 since 1950 and accounted for 79.5% of the water input into the lake while evaporation accounted for 86.2% of the water loss from the lake. The lake depth was above 4 m during the years rainfall was above normal average of 1180 mm, except during the period 2011-2014. The contribution of Nile tilapia to total catch and CPUE changed with rainfall and lake depth up to 2000, after which they decreased despite increase in rainfall. There was a strong positive correlation between lake depth and average total length of Nile tilapia (r = 0.991, p < 0.001) and length at 50% maturity (r = 0.726, p < 0.001).The length-weight allometry between high and low lake depths was significantly different [t (6) =3.225, p < 0.05], with Nile tilapia being heavier (for a given length) at high lake depth than at low lake depth. Fecundity of Nile tilapia was higher and egg diameter lower than what is reported in literature. Nile tilapia shifted from algal dominated diet during the wet season to include more insects during the dry season. The study showed that the catches and biological characteristics of Nile tilapia change with climate and hydrological factors and these need to be considered in management of the fisheries of Lake Wamala.
  • Final report of the fisheries catch assessment survey conducted in December 2015 on the Ugandan waters of Lake Victoria

    Catch Assessment National Working Group (National Fisheries Resources Research Institute (NaFIRRI)Jinja, Uganda, 2016)
    This CAS report provides estimates of the quantities of fish landed in the riparian districts sharing the Ugandan waters of Lake Victoria; the monetary value of the fish catches; the contribution of different fish species to the catches; and the trends in fish catch rates, and the monthly catches for the sampled month since the beginning of harmonized CAS activities in July 2005 to December 2015. The report also compares the annual catch and gross beach value of catch landings in 2005, 2006, 2007, 2010, 2014 and 2015. A total of 15 CASs have been undertaken in the Uganda sector of the lake with data gaps in 2009, 2012 and 2013 due to financial constraints. The annual catch estimates for the years 2010, 2011, 2014 and 2015 were based on one sampling covering the rainy season and may not capture changes that could occur in dry season. There is need to include dry season sampling in future surveys.
  • Final report of the fisheries catch assessment survey in the Ugandan waters of Lake Victoria for the May 2014 survey

    Catch Assessment National Working Group (National Fisheries Resources Research Institute (NaFIRRI)Jinja, Uganda, 2014)
    This report presents findings of the CAS conducted in the Ugandan waters of Lake Victoria in December 2015. The results of the previous thirteen harmonized CASs conducted since July 2005 (July, August, September and November 2005; in March, August and December 2006; in March and August 2007; in February and December 2008; March 2010; May 2011 and May 2014) are included to show the emerging trends. The report also presents annual catch estimates for the Ugandan part of the lake from 2005 to 2015. This information together with other fish stock assessment and socio-economic monitoring survey data can now be utilized in the planning and management of the fisheries resources of Lake Victoria. The 2014 CAS results were very vital in the development of the Lake Victoria Fisheries Management Plan 2014.
  • Cast-net fishery on northern portion of Lake Victoria and upper Victoria Nile

    Okwakol, M. (Fisheries Training Institute, Department of Fishing Methods and Gear Technology, 2001)
    This project survey on cost-net was conducted at the Northern portion of Lake Victoria and Upper Victoria Nile. The selected fish -Landing sites, where sampling exercises were carried out include: Loco, Jinja pier (covering Lake Victoria) and Railway bridge, New bridge and Kalange (covering upper Victoria Nile).Research was focused on the cast-net design, target commercial fish stocks, impact of cast-net on the fish stocks, mesh-size and techniques ofcast-netting.The research results show that cast-net fishery destroys fish breeding and nursery grounds and other fish ecosystem.The gear targets Oreochromis niloticus and Occassional by catches e.g. Lates niloticus, Mormyrus Kannume Bagrus docmak and Clarias gariepinus.The multi-panel cast-net of mesh-sizes ranging from i (5lmm) to 6' (152mm) were adaptable by fishermen but they mostly caught immature fish.Nevertheless, this gear showed highest efficiency compared to other gears used at the project area.These research results will be useful to researchers, extension workers and Fishenes, students under taking special research or study on this gear.
  • Annual report on fish production Lake George, Edward and Kazinga Channel (Kichamba Region) 1993/1994

    Rukuunya, E. (Department of Fisheries ResourcesEntebbe, Uganda, 1994)
    This report gives details of catch assessment statistics of Lakes George, Edward and Kazinga channel plus minor Lakes in western Uganda. Eight districts are covered namely:-Kasese, Bushenyi, Rukungiri, Kabarole, Ntungamo, Mbarara, Kabale and Kisoro. Of the eight districts major lake fishery is in the first four, the rest minor lake fishery as shown below:-Ntungamo- Nyabihoko and Nyakiyanja, Mbarara-Mburo, Kachere and Nakivale, Kisolo- Mutanda, Mulehe, Chahafi and Kayumbu) and Kabale Lake Bunyonyi). Data on Lake Bunyonyi was not availab1e for both 1993/94; however reports say fewer Clarias are caught using basket traps and hooks.
  • Investigation into the meteorological aspects of the variations in the level of Lake Victoria

    Mörth, H.T. (East African Common Services Organization. Meteorological DepartmentNairobi, Kenya, 1967)
    The level of Lake Victoria has, since 1961, reached a height which caused serious flood damage. Already the financial implications are considerable for Kenya, Tanzania and Uganda. If further rises can be anticipated, expenditure on flood control measures to the tune of several million pounds sterling must be envisaged. If such rises should lead to uncontrolled discharge at the Owen Falls Dam site because of overshooting, downstream districts of Uganda and the Sudan may be seriously flooded. All this merits a thorough study, and any indication of the future behaviour of lake levels, even when associated with a low probability, must be taken into account.In these circumstances the Water Development Department of Kenya approached the East African Meteorological Department in November, 1964, on behalf of all parties concerned with the request to study the meteorological background of the Iake level variation, with a view to forecasting future behaviour.
  • Annual Report of the Game and Fisheries Department for the period 1st January, 1954, to 30th June, 1955

    Game and Fisheries Department, Uganda Protectorate (Game and Fisheries DepartmentEntebbe, Uganda, 1955)
    The fisheries section of the annual report covers information from the following regions:Lake Albert Region:IntroductionStaffLaunchLicensingProductionExport to the Belgian CongoMarketingDepartmental Activities Sporting FishingStatisticsRainfall and Fish LandingAcholi regionLakes George/Edward Region:IntroductionGeneralLake GeorgeThe Kazinga Channel-KatunguruLake EdwardMinor Lakes Ruwenzori TroutFisheries LaunchRecords of CatchesLake Kyoga Region:IntroductionGeneralLake, Kyoga and Minor LakesProduction and fish farming
  • Annual Report of the Game Department for the year ended 31st December 1949

    Game Department, Uganda Protectorate (Game Department, Uganda ProtectorateEntebbe, Uganda, 1950)
    The fisheries section of the Annual report provides information on the following:(1) General information(2) Legislation(3) Nets(4) Imports and Exports of Dried FishB) Economic:-(1) Lake Victoria(2) Lake Albert (including the Albert Nile)(3) Report by Lake Albert Fisheries Officer(4) Lake Edward and Associated Fisheries(5) Lake Kyoga(6) Minor Lakes and the Victoria Nile(7) Dams and(8)Fish Transfers
  • Detrimental human activities in critical fish habitats such as breeding and nursery zones

    Kamira, B. (National Fisheries Resources Research InstituteJinja, Uganda, 2010)
    The poster explains human activties carried out in critical fish habitats such as breeding and nursery zones.

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