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  • Fisheries  (112)
  • Environment  (17)
  • Cell & Developmental Biology
  • Inorganic Chemistry
  • National Fisheries Resources Research Institute (NaFIRRI)
  • 1
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/16556 | 6 | 2016-02-19 09:17:14 | 16556 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-06
    Description: Between July 2005 and February 2008, ten Catch Assessment Surveys (CASs) were conducted at 54 pre-selected fish landing sites in the Ugandan part of Lake Victoria comprising approximately 10% of all landing sites in each of the 11 districts sharing the lake. The CASs were conducted following regionally harmonised Standard Operating Procedures (SOPs). This report covers the CAS conducted in February 2008 and puts into context the trends generated by results of the previous surveys. The catch rates of Nile perch in gillnetting boats with motor/sail, reduced from 26.9 kg boat-1 day-1 in August 2007 to 22.8 kg boat-1 day-1 in February 2008. Whereas the catch rates of paddle Sesse boats remained more or less the same as in August 2007. The Nile perch catch rates of the long line fishery of the boats using motor/sail was similar, 35 and 36 kg boat-1 day-1 in August 2007 and February 2008 respectively but the catch rates of paddle Sesse boats using long lines showed some more increase from 19 to 22 kg boat (-1) day (-1). In the tilapia fishery, the catch rates of the parachute boats using gillnets showed further decrease in a row from 12.6 kg boat-1 day-1 in December 2006, 11.6 kg boat-1 day-1 in March 2007, 11.2 kg boat-1 day-1 in August 2007 and 10.0 kg boat-1 day-1 in February 2008. The overall impact of reduced catch rates in the predominant effort groups, e.g. gillnetting boats using motor/sail in the Nile perch fishery and Parachute boats using gillnets in the tilapia fishery overshadowed the increases in less dominant effort groups and resulted in the lowest monthly catch estimates recorded in the surveys conducted since 2005. Whereas there was a clear downward trend in the Nile perch catch rates of boats using gillnets, which corroborates with the information of declining stocks from the recent Acoustics surveys, the catch rates in the long line fishery remained stable and even somewhat increasing in the last four surveys. The factors that maintain high catches against reduction of fish biomass in the long line fishery and their effects on sustainability of the Nile perch fishery should be investigated further. The Mukene fishery, characterised by large fluctuations in the catch rates did not show much change in the last two surveys in August 2007 and February 2008 and the annual catch estimates showed an overall increase of 7% from 2005 to 2007. The Mukene fishery in the Ugandan waters of Lake Victoria remained a near shore fishery in which paddle Sesse boats using small seines or scoop nets were the dominant craft.
    Description: Implementation of a Fisheries Management Plan (IFMP) Project for Lake Victoria
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
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  • 2
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17184 | 4230 | 2015-06-13 18:17:59 | 17184 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-10
    Description: The purpose of this output was to use the results of the baseline and participatory diagnostics analysis to develop alternative innovations for agricultural production, natural resource management and food security.The farming systems in the project areas were analysed to identify the innovations that communities had been using for agricultural production, natural resource management and food security. The innovative strategies were examined for their contribution to sustainable agriculture, food security and natural resource management. Comparative analysis of the agricultural productivity, food security and natural resource management in the different areas where the innovations have been put in place was undertaken.The best practices would be identified, which should be scaled-up, modified orsustained. The willingness and perceptions of the farmers to adopt the innovations would then be assessed.
    Description: First Technical Progress Report, January – December 2010
    Keywords: Agriculture ; Fisheries ; Health
    Repository Name: AquaDocs
    Type: monograph
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  • 3
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja,Uganda
    In:  http://aquaticcommons.org/id/eprint/17204 | 4230 | 2015-06-13 17:24:23 | 17204 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-11
    Description: 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.
    Keywords: Fisheries ; Limnology
    Repository Name: AquaDocs
    Type: monograph
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  • 4
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17234 | 4230 | 2016-02-23 09:02:05 | 17234 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-11
    Description: The annual report presents present activities and achievements for the reporting year 2011/2012. The Objectives of NaFIRRI are highlighted below:a) Generation of knowledge and technologies of strategic importance for the management, development and conservation of fisheries resources and water quality.b) Establishment and management of the human, physical and financial resources of the National Fisheries Resources Research Institute.c) Provision of technical backstopping and capacity building to the Ministry of Agriculture, Animal Industry and Fisheries (MAAIF), Zonal Agricultural Research and Development Institutes (ZARDIs) and other agencies dealing in fisheries research and water quality.d) Development and management of fisheries research information and ensuring collaboration with stakeholders.e) Planning, monitoring and evaluation of all fisheries research programmes undertaken by the institute to ensure conformity with national research strategy.f) Ensuring the quality of knowledge and technologies developed, multiplied and disseminated through uptake pathways.g) Generation of periodic reports on fisheries and water quality research programmes to National Agricultural Research Council (NARC) and other stakeholders.h) Establishment of sustainable linkages and partnerships with local, regional and international research bodies.
    Keywords: Fisheries
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    Type: monograph
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  • 5
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17220 | 4230 | 2021-02-27 20:52:02 | 17220 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-11
    Description: The study is prompted by the poverty that persisted among the fishing communities of lake victoria at time of considerable cash inflow into the fisheries development of fish processing industry. There has been need for understanding of the poverty and what strategies would be most appreciate for it's reduction.This study has attempted to respond to the needby identifying the nature and distribution of the poverty within the fisheries lake victoria,Uganda, the factor responsible for itand the options for poverty reduction intervention. The study examined the global and regional perspectives of poverty and wealth distribution, noting that wide disparities existed between the developed and the developing world and also between the developing countries themselves. A historical review of development policies and strategies revealed that while successive strategies were able to contribute to growth, their achievement towards poverty alleviation were less than satisfactory, hence the need forcontinually developing new strategies.A background to Uganda’s society and economy is provided, examining the demographic, political, environmental and economic conditions of the country. Uganda’s developmentstrategies are reviewed, highlighting the role of the Poverty Eradication Action Plan, Uganda’s main strategy for implementing the policy of poverty reduction and wealthdistribution. At the agricultural sector level, the Plan for the Modernisation of Agriculture has been formulated, followed by the National Fisheries Policy, aimed at providing a policy framework for the management and development of the fisheries.An appropriate definition of poverty was formulated, considered relevant to the situation ofLake Victoria. The dimensions of poverty included inadequate basic necessities, low education and health achievements, a sense of insecurity and exposure to risk. The research methodology was enhanced by the examination of the Lélé Model of the Poverty–Environmental Degradation problem, the World Bank Model of Poverty Causation and thesubsequent Lake Victoria Model developed in this study. It has provided a plan for the research, the consideration of criteria and a data collection plan. The data collectioninstruments included secondary data search, key informant interviews and a sample survey based on a structured questionnaire.The study identified all the four dimensions of poverty in the fisheries, provided poverty profiles with respect to the different activities, groups of people and regions in the fisheries, based on consumption poverty. Among the people identified to be in poverty were the fishing labourers, fishers of Oreochromis niloticus and those operating with non-powered boats. In the post-harvest fisheries, large proportions of processors involved in salting and sun-drying, market stall and bicycle traders were in the poverty category. The ethnic groups most affected included the Samia, Basoga and Bakenye while the Districts of Jinja, Bugiri and Busia had the highest proportions of fishers in the poverty category. With respect to the other dimensions of poverty, the study showed that educational achievement was low within the fishing communities. The health status was poor, due mainly to the prevalence of malaria, diarrhoea, bilharzia and HIV/AIDS. There was a sense of insecurity within certain sections of the fishing community, due to leadership weaknesses within the local as well as the Government institutions. Some community members operated in a state of risk because they were vulnerable to episodes of income, health and education. The causes of poverty in fisheries included weaknesses within the institutional and social environment, limitations in the technology available to the poor, resource degradation and unfavourable economic factors. The recommendations of the study for poverty reduction included strengthening of policies, developing links, improving capacities and increasing resources, to be applied at the levels of Central Government, Local Government and of the community. In view of the achievements of the methodology used on this study, involving reference to the models, it is recommended that future research should build upon this model approach, as it will continue to produce results, especially when attempting to forecast changes relating to interventions.
    Description: Lake Victoria Environmental Management Project (LVEMP)
    Keywords: Fisheries ; Sociology
    Repository Name: AquaDocs
    Type: monograph
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  • 6
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17235 | 4230 | 2016-02-19 09:42:44 | 17235 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-11
    Description: The Mandate of the National Fisheries Resources Research institute (NaFIRRI) is to manage, promote and undertake applied and basic research of strategic and national importance in aquaculture, capture fisheries, water environment, socio-economics and marketing, information communication management and any emerging issues in the fisheries
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
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  • 7
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17284 | 4230 | 2016-03-04 08:58:43 | 17284 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-11
    Description: The field survey was undertaken by NaFIRRI technical staff. The terms of reference for the survey were to make an assessment of the lake for possible cage fish farming. The survey was undertaken on the 26 August 2010 by a team composed of the several. The lake supports small subsistence fishing activities by the local communities livingaround it. Information from the local community indicates that the fish species/typesoccurring in the lake include the Ngege, Nile perch, the African catfish and the lung fish.The fishing crafts in operation are largely Dug-out and Bao Tatu canoes and the main fishing gears are nylon and monofilament gillnets, hooks and beach seines.
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
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  • 8
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/16650 | 4230 | 2015-04-10 17:42:29 | 16650 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-07
    Description: This report presents findings of the CAS conducted in the Ugandan waters of Lake Victoria in May 2011. The results of the previous eleven CASs conducted under the IFMP of the LVFO programme in July, August, September and November 2005; in March, August and December 2006; in March and August 2007; in February and December 2008; and March 2010 are included to show the emerging trends. The report also presents annual catch estimates for the Ugandan part of the lake from 2005 to 2011.Through these CASs, information is building up to show the emerging picture of fish production in the Ugandan waters of the lake. Similar surveys are conducted in the Kenyan and Tanzanian parts of the lake, which provide the lake wide perspective of fisheries production but this time not simultaneously as under the LVFO effort due to different sources and timing of funding. These data can now be utilised together with other Resource and Socio-economic Monitoring survey data for a stock assessment of the lake to provide a firm basis for planning and management of the fisheries resources.
    Description: World Bank
    Description: Agricultural Technology Agribusiness and Advisory Services (ATAAS)
    Description: Catch Assessment Survey jointly conducted by the National Fisheries Resources Research Institute (NaFIRRI), the Department of Fisheries Resources (DFR), and the districts of Busia, Namayingo, Mayuge, Jinja, Mukono, Buikwe, Buvuma, Wakiso, Kampala, Mpigi, Masaka, Kalangala and Rakai.
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
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  • 9
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/16648 | 4230 | 2015-04-10 18:12:42 | 16648 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-07
    Description: Lake Albert and Albert Nile are a major source of fisheries resources sustaining the riparian communities in Uganda and the Democratic Republic of Congo (DRC). Like all shared bodies of Uganda Lake Albert and Albert Nile fisheries are faced with immense exploitation pressure one time described as the tragedy of the commons. In Uganda, the lake is shared by five riparian districts namely: Buliisa, Bundibugyo, Hoima, Kibaale and Nebbi. The lake covers a total estimated surface area of 5,270 square kilometers with approximately 60% within Ugandan waters. It is located in the western part of the great rift-valley at an altitude of 618 m above Sea level. The central parts of the lake are characterized by steep escarpments whereas the northern and southern parts lie in a plain of the rift valley. The plains are gently sloping, resulting in shallow swampy inshore waters in many places. The major inflowing rivers are the Semliki and Kafu in the south, and the Victoria Nile at the northern tip. The lake has a diverse fish fauna with a gradient of multi-species fisheries in different parts of the lake.The overall objective of the Frame Survey was to provide information on the facilities and services at landing sites and the composition, magnitude and distribution of fishing effort to guide development and management of the fisheries resources of Lake Albert and Albert Nile.The specific objectives were to provide information on:a) The number of fish landing sites;b) The facilities available at the fish landing sites to service the sector including accessibility;c) The service providers especially fisheries staff at fish landing sites;d) The number of fishers;e) The number and types of fishing crafts and their mode of propulsion;f) The number, types and sizes of fishing gears used on the lake and their mode of operation.
    Description: National Environmental Management Authority (NEMA)
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
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  • 10
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/16649 | 4230 | 2015-04-24 14:01:27 | 16649 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-07
    Description: A Catch Assessment Surveys (CAS) with the overall objective of generating information on the fish production and commercial value of the fisheries of Lake Albert and Albert Nile system was implemented by the National Fisheries Resources Research Institute (NAFIRRI) in collaboration with the Department of Fisheries Resources (DFR), Local Government staff (FOs) and BMU members at selected landing sites on Lake Albert (12 landing sites) and Albert Nile (26 landing sites) in July 2012.A total 622 and 313 boat days on Lake Albert and Albert Nile respectively were sampled for a period of 9 days. Results indicate an annual landing of 151,600 and 5,900 tonnes (t) of fish with an estimated beach value of 122.5 and 14 Billion (UShs) from Lake Albert and Albert Nile respectively. Over 80% of the catch from Lake Albert comprised the small pelagic species; Neobola bredoi (Muziri) and Brycinus nurse (Ragoogi) followed by Nile perch (6%). However, due to low market value of the small fishes and the high prices attached to Nile perch for industrial processing and export market, the contribution of the latter to beach value rose to 34% of the total. The contribution of the light fishery based on small pelagic species (B. nurse and N. bredoi) are insignificant on Albert Nile. Even if the small pelagic species may be present in the river system, a light fishery based on these two is yet to be developed. Proportionally, Albert Nile still remain a multispecies fishery with over 20 fish species harvested commercially. Interestingly, the Albert Nile fishery still remains primitive with simple crafts and gears (mainly dugout canoes, traps, and gillnets). This could suggest that the more developed the system becomes the higher the level of transformation in its fisheries leading to simplification, characterized by reduction in multispecies nature and dominance of few species.Illegal gears especially undersized gillnet of mesh size less than 4 inches were the most dominant in the Lake Albert and Albert Nile fisheries. They captured large quantities of immature fish particularly when used to target Nile perch, Bagrus, Nile tilapia, and large Barbus spp. Their impact when used to target the smaller species (Ragoogi, Angara & Ngasia) is yet to be evaluated. A specific study to analyze selectivity and impacts of these nets is a recommended. However, the dominance of 1.5” mesh sizes especially on Albert Nile to target Angara, Ngassia and Barbus, is definitely destructive to their fisheries and should be checked forthwith. In addition, there is an emerging fishing method locally referred to as “Salsio or Luzira” whereby fishers stay on the lake from 3 days up to 2 weeks without returning to the landing site. They carry with them food and salt for processing the catches on the lake, and in the case of Albert Nile on make shift shelters on islands and in the game park. They normally use gillnets of 3-3½ inch mesh size and caught mainly Nile perch & Bagrus (Pethi & Munama). On return they land several tons of fish. Most of these Catches are not captured in the estimates presented in our analyses since we target daily fishing boats. The possible impacts of this fishing method should be studied and appropriate action recommended.
    Description: ATAAS Project 5: Monitoring changes in stocks of the major commercial fish species in the five major water bodies of Uganda (Victoria, Albert, Kyoga, Edward and George)
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
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  • 11
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17147 | 4230 | 2016-02-27 15:59:45 | 17147 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-10
    Description: The survey covered by this report was undertaken between 6 th and 9th October 2009 as a follow-up on the during construction surveys of the Bujagali Hydropwer Project (BHPP). In addition to two pre-construction baseline surveys in April 2000 and April 2006, four monitoring surveys have so far been undertaken i.e. in September 2007, April 2008, April 2009 and the present one, in October 2009. The 2009 biannual monitoring surveys were conducted at an upstream and a downstream transect of the BHPP with emphasis on the following aspects: 1. water quality determinants 2. biology and ecology of fishes and food webs 3. fish stock and fish catch including economic aspects of catch and 4. sanitation/vector studies (bilharzias and river blindness)
    Description: Monitoring carried out by NaFIRRI nn behalf of Bujagali Energy Limited (BEL)
    Keywords: Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: monograph
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  • 12
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17181 | 4230 | 2016-02-19 11:02:51 | 17181 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-10
    Description: Source of the Nile Fish farm (SON) is located at Bugungu area in Napoleon Gulf, northern Lake Victoria. The proprietors of the farm requested for technical assistance of NaFIRRI to undertake regular environment monitoring of the cage site as is mandatory under the NEMA conditions. Thus, NAFIRRI undertakes quarterly environment surveys in the cage area covering selected physical-chemical factors i.e. water column depth, water transparency, water column temperature, dissolved oxygen, pH and conductivity; nutrient status, algal and invertebrate communities (zooplankton and macro-benthos) as well as fish community. The first environmental survey was undertaken in February 2011. Results/observations made during the second quarter (April-June 2011) field survey are presented in this technical report along with 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 cages including natural fish communities.
    Keywords: Aquaculture ; Environment
    Repository Name: AquaDocs
    Type: monograph
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  • 13
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17187 | 4230 | 2016-02-26 17:11:45 | 17187 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-10
    Description: The result reported were from a monitoring survey no.8 undertaken between 6th and 10th April 2011 during construction period of the Bujagali Hydropwer Project (BHPP). Two pre-construction, baseline surveys in April 2000 and April 2006 were conducted and so far,durin construction phase of the project, seven monitoring surveys have been undertaken i.e. in September 2007, April 2008, April 2009,October 2009, April 2010, September 2010 and the present one, in April 2011. Since 2009 biannual monitoring surveys have been conducted at an upstream and a downstream transect of the BHPP with emphasis on the following aspects: Water quality determinants Biology and ecology of fishes and food webs Fish stock and fish catch including economic aspects of catch and Sanitation/vector studies (bilharzias and river blindness)
    Keywords: Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: monograph
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17202 | 4230 | 2016-02-19 09:21:41 | 17202 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-11
    Description: 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.
    Description: Environmental Assessment Consult Limited (EACL)
    Keywords: Environment ; Fisheries
    Repository Name: AquaDocs
    Type: monograph
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17208 | 4230 | 2021-02-27 20:44:10 | 17208 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-11
    Description: The purpose of the study was to investigate migratory movements of fishermen on lake victoria.To identify the cuases of fishrmen migration with a view to establishing the paterns of migration;determining season of migration and assessing the impacts of migration on fisheries management and development.
    Description: Implementation of a Fisheries Management Plan (IFMP)
    Keywords: Fisheries ; Sociology ; Lake Victoria Fisheries Research Organization ; LVFO
    Repository Name: AquaDocs
    Type: monograph
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda.
    In:  http://aquaticcommons.org/id/eprint/17227 | 4230 | 2016-02-23 09:55:42 | 17227 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-11
    Description: The fisheries of small lakes are important for producing fish for local populations not clear the larger lakes.The satelite support important fisheries and other economic activities like fishing water for domestic purpose and tourism besides socio-cultural functions.
    Description: Lake Victoria Environmental Management Project (LVEMP)
    Keywords: Fisheries ; Sociology
    Repository Name: AquaDocs
    Type: monograph
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17223 | 4230 | 2016-02-19 11:12:33 | 17223 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-11
    Description: postive transformation of the fisheries sector in Uganda has of recent been scatted by failure to mountain fish quality and safety,akey prerequiste for retaining and gaining fish markets.The social cultural study established the extent to which social cutural practices had affected the levels and the use of sanitation facilities,fish handling facilities and artisanal fish processing techniques and the factors that influenced these practices in the fishing communities of lake victoria.This information is of significance for the purpose of advocacy and mobilization of fishers in order to improve sanitation, fish handling and artisanal fishing processing situation in the fishing communities.
    Description: Lake Victoria Environmental Management Project (LVEMP)
    Description: This is LVEMP Socio-Economic Research Report, 6
    Keywords: Fisheries ; Sociology
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17144 | 4230 | 2016-03-01 14:25:04 | 17144 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-10
    Description: Following the commencement of construction works of a 250 MW hydropower plant at Dumbbell Island in the Upper Victoria Nile in September 2007, BEL requested NaFIRRI to conduct continuous monitoring of fish catches at two transects i.e. the immediate upstream transect of the project site (Kalange-Makwanzi) and the immediate downstream .transect (Buyala-Kikubamutwe). The routine monitoring surveys were designed to be conducted twice a week at each of the tWo transects. It was anticipated that major immediate impacts were to occur during construction, and these needed to be known by BEL as part of a mitigation strategy. For example, the construction of it cofferdam could be accompanied by rapid changes in water quality and quantity downstream of the construction. These changes in turn could affect the fish catch and would probably be missed by the quarterly monitoring already in place. Therefore, a major cbjective of the more regular and rapid monitoring was to discern immediate impacts of construction activities by focusing on selected water quality parameters (total suspended solids, water conductivity, temperature, dissolved oxygen and pH) and fish catch characteristics (total catch, catch rates and value of the catch)
    Description: Prepared for Bujagali Energy Limited (BEL)
    Keywords: Environment ; Fisheries
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    Type: monograph
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17371 | 4230 | 2016-03-04 09:05:36 | 17371 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-11
    Description: The Nabugabo lakes are an important source of affordable protein food inthe form of fish, income, water for domestic and commercial purposes(aquaculture farm and Hotels), handcraft materials (mats, hats, roof thatch) andfishing floats and rafts. Nabugabo lakes provide employment, income and exportearnings to Uganda that flow from the act of harvesting the fish. In Uganda thefisheries sector directly employs 350,000 people and indirectly 1.2 million people.In 2005, it is estimated that about 370,000 mt fish export (97-98% Nile perch)earned Uganda US $ 143 Million up from US $ 103 million in 2004 .and up fromUS $ 45 million in 1996. , making it almost become the first non' traditional exportcommodity. The Nabugabo lakes are also import for cultural values and fishspecies from these lakes are important in evolutionary studies. The fishery sectoris therefore very important in Uganda's socio-economic life. Despite the abovevalues to the communities and global biodiversity roles, the amount of fish caughtand the number fishing fleets operating on the Nabugabo lakes to guidemanagement of the lake are lacking. The fishery that exists in these lakes islargely for subsistence and commercial purposes specific for Lake Nabugabobased on introduced species (Nile perch and Nile Tilapia). The fish is caughtusing mainly gill nets and long line hooks.
    Description: On title page: Theme 3: Enhancing integrated management of natural resources Project : Generation of knowledge and technologies that ensure sustainable utilisation of fish stocks (capture fisheries)
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/19334 | 4230 | 2020-09-07 21:42:41 | 19334 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-06-25
    Description: Rastrineobola argentea locally known as mukene in Uganda, omena in Kenya anddagaa in Tanzania occurs in Lake Nabugabo, Lake Victoria, the Upper Victoria Nile andLake Kyoga (Greenwood, 1966). While its fishery is well established on Lakes Victoriaand Kyoga, the species is not yet being exploited on Lake Nabugabo. Generally such smaller sized fish species as R argentea become important commercial species in lakes where they occur when catches of preferred larger-sized table fish start showing signs of decline mostly as a result of overexploitation. With the current trends of declining fish catches on Lake Nabugabo, human exploitation of mukene on this lake is therefore just a matter of time. The species is exploited both for direct· human consumption and as the protein ingredient in the manufacture of animal feeds.
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/19341 | 4230 | 2020-09-07 22:06:21 | 19341 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-06-26
    Description: Decline in fish stocks and fish species diversity due to excessive fishing effort. 2. Use of destructive fishing gears and methods e.g seines, cast nets, of recent mono-filament nets, tycooning, etc. 3. Capture of immature fish. 4. Invasion by water hyacinth and floating sudds 5. Ineffective management of fisheries due to limited (reluctance) community participation in lake management affairs. 6. Of recent, illegal buying and selling of fish in the lake without landing deprives the department of statistics and also puts the owner of fishing vessels at risk. 7. Lack of coordination among fisheries departments of districts of Kyoga basin (Le. differences in policies from districts to district -laxity in law enforcement). 8. Inadequate investment skills among fishers . .9. Political interference -creation of illegal landings 1a.llI-facilitated field staff. makes monitoring difficult and kills morale • . 11. Pollution and degradation of• the fish habitat from construction works and agro-cbemicals. 12. Poor infrastructure 13. Lack of control of licensing by fisheries staff 14.The rising water levels in the lake cause serious impacts to the fishing expeditions by way of destruction of the fishing gears and sudden blockages of landing site entries. 15. Some areas at the •shoreline show high degree of sedimentation. These areas being breeding areas for fish are seriously interfered. 16. Water hyacinth is still highly patched in some fishing grounds
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/19326 | 4230 | 2020-09-07 21:03:02 | 19326 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-06-25
    Description: Productivity processes may be defined as involving the conversion/mobilisation of energy for storage into various biological forms. The major biological (forms relevant to this presentation are bacteria, algae aquatic macrophytes, invertebrates and fish. The non living form is Deritus.The purpose of this paper is to outline in generalised terms, the processes through which energy is mobilised from the various transitional storage towards fish production
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/19337 | 4230 | 2020-09-07 21:44:19 | 19337 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-06-25
    Description: Fisheries are based on stocks of wild animals living in their natural environment stock is a sub-set of one species having the same growth and mortality parameters, and inhabiting a particular geographic area and has little connection with adjacent groups. The fish stocks are affected by man's activities and the success of the fisheries depends critically on the state of the fish stocks. Decision-makers need scientific advice about the state of the fish stocks. The science of stock assessment is concerned with provision of this advice
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/19346 | 4230 | 2020-09-07 22:02:29 | 19346 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-06-26
    Description: Overview: Fish distribution patterns•Definition of habitatSpatial dimensions of habitatstemporal dimensions of habitatsFish Movements and MigrationsFactors affecting suitability of fish habitatsHabitat structureThe influence of watershed characteristics on fish habitatsFish habitat conservation issues for Lake KyogaThe way ahead for fisheries management for all water bodies Comprehensive policy interventions at local-district and national levels for lakes
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20153 | 4230 | 2016-02-25 13:06:39 | 20153 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Evolution of fisheries research and FIRRIThe earliest approach to fisheries research in Uganda dates from the first fisheries survey of Lake Victoria by Michael Graham between 1927 and 1928 (Graham,1929). Based on references to the rich fisheries that were reported to Graham, itappears that during the 18th Century, catch per net per night averaged 300 tilapia,a revelation that led Graham to conclude that Lake Victoria is a tilapia lake. The"tilapia" later came to be known as Tilapia esculenta and T variabilis(Oreochromis esculentus and O. variabilis) respectively.
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20155 | 4230 | 2016-02-25 13:16:58 | 20155 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: The first fishery survey of Lake Victoria was conductedbetween 1927 and 1928 (Graham 1929). Atthat time,the lake had a diverse fish fauna and the fishery wasdominated by two endemic tilapiine cichlids;Oreochromis esculentus (Graham 1929) and O.variabilis (Boulenger 1906). There were a number ofother species such as Protopterus aethiopicus Heckel1851, Bagrus docmac (Forsk.) 1775, Clarias gariepinus(Burchell), Barbus species, mormyrids, Synodontis spp,Schilbe intermedius (Linn.) 1762 and Rastrineobolaargentea Pellegrin, 1904 that were also abundant inthe lake most of which made a significant contribution tothe fishery (Graham 1929, Worthington 1929, 1932,Kudhongania & Cordone 1974). Haplochromine cichlidswere represented by at least 300 species more than99% of them endemic (Greenwood, 1974; Witte et al.,1992 a & b). The fishery of Lake Victoria was similar tothat of lakes Kyoga and Nabugabo (Worthington 1929;Trewavas 1933; Greenwood 1965, 1966; Beadle 1962,1981).There were also important fisheries on the inflowing rivers of Lake Victoria, the most important of which were Labeo victorianus and Barbus altianalis (Cadwallader 1965). The small sized species notably Rastrineobola argenteaand haplochromines cichlids were not originally commercially exploited.
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20159 | 4230 | 2016-02-25 13:27:57 | 20159 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Fishing communities that have exploited the resource forgenerations constitute the main stakeholder groups in thefisheries of Lake Victoria. Several studies have examinedUganda's Lake Victoria fishing communities andcharacterised key stakeholders at community level over thelast decade (SEDAWOG 1999a and b; Geheb 1997;FeSEP 1997; Kitakule 1991).The communities are made up of scattered settlements at the shores and on islands.The categories of people living in these communities include fishers who consist primarily of large numbers of male youths who provide labour to boat and gear owners.There are resident and non-resident fish traders who after securing their supplies at the beaches, depart for their market destinations. In addition, there are fish processors,mostly operating traditional and improved smoking kilns. Many other people, dealing in provisions and supplies also stay at the beaches, their activities depending on thelevel of fish catch. The fishing communities of Lake Victoria, Uganda, include auxiliary livelihood activities such as boat building, net repairing and transportation; bait supply and beachside kiosks, video halls and retail shop business. Other economic activities are brick making, charcoal burning/wood trade, farming and livestock keeping.
    Keywords: Fisheries ; Sociology
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20160 | 4230 | 2016-02-25 13:30:27 | 20160 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Most of the earth's ecosystems are experiencing slight tocatastrophic losses of biodiversity, caused by habitatdestruction, alien species introduction, climate change andpollution (Wilcove et al., 1998). These human effects haveled to the extinction of native fish species, the collapse of their populations and the loss of ecological integrity and ecosystem functioning (Ogutu-Ohwayo & Hecky, 1991;Witte et al. , 1992a; Mills et al., 1994; Vitousek et al., 1996).Food webs are macro-descriptors of community feedinginteractions that can be used to map the flow of materialsand nutrients in ecosystems (Jepsen & Winemiller, 2002).Comparative food web studies have been used to address theoretical questions such as 'does greater trophic connectivity increase stability?' (Cohen et al., 1990), and 'does the number of trophic levels increase with productivity?' (Briand & Cohen, 1987). Answers to such questions have obvious applications for natural resources management. From a multi-species fisheries standpoint, there is a need to understand consumer-resource dynamics within complex trophic networks.
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20156 | 4230 | 2020-09-07 16:40:28 | 20156 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Until the 1970s, Lake Victoria had a multi-species fisherydominated by the tilapiine and haplochromine cichlids.There were important subsidiary fisheries for more than20 genera of non-cichlid fishes, including catfishes(Bagrus docmak, Clarias gariepinus, Synodontis sppand Schilbe intermedius), the lungfish (Protopterusaethiopicus) and Labeo victorianus) (Kudhongania andCordone 1974). Stocks of most of these speciesdeclined and others disappeared following theintroduction of four tilapiines (Oreochromis niloticus,Oreochromis leucostictus, Tilapia rendalli and Tilapiazillit) and Nile perch (Lates niloticus) during the 1950s.Since then the commercial fishery in the Uganda portion of Lake Victoria has been dominated by the Nile perch, Nile tilapia (Oreochromis niloticus) and the native cyprinid species, Rastrineobola argentea (Mukene).
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20158 | 4230 | 2016-02-25 13:25:15 | 20158 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Rastrineobola argentea locally known as mukene inUganda, omena in Kenya and dagaa in Tanzania occursin Lake Nabugabo, Lake Victoria, the Upper VictoriaNileand Lake Kyoga (Greenwood 1966). While its fisheryis well established on Lakes Victoria and Kyoga, thespecies is not yet exploited on Lake Nabugabo.Generally such smaller sized fish species as R. argentea become important commercial species in lakes where they occur when catches of preferred largersized table fish start showing signs ofdecline mostly as a result of overexploitation.With the current trends of declining fish catches on Lake Nabugabo, human exploitation of mukene on this lake is therefore just a matter of time. The speciesis exploited both for direct human consumption and as the protein ingredient in the manufacture of animal feeds.
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20162 | 4230 | 2016-02-25 13:32:49 | 20162 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: The success of fisheries management depends very much on the effectiveness of the legal framework in use. A historical perspective of the fisheries of Lake Victoria, Uganda, suggests that fisheries management has not been very successful. This chapter reviews the legal framework with a view to assessing its impact on fisheries management on Lake Victoria, Uganda
    Keywords: Fisheries ; Law
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20183 | 4230 | 2016-02-26 15:44:58 | 20183 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Of all the great lakes, Lake Victoria has the highest population concentration on its fringes. This has resulted into serious human impacts on the ecosystem through intense agricultural activities (cultivation, livestock and over fishing), sporadic settlements, urbanization and industrial establishments. The consequences have been loss of animals and plant life, deforestation and general land degradation, pollution, loss of water quality and clean air. Aquatic life has become endangered and less guaranteeing to continued fish production. Awareness workshops and general talks have been done to a few selected communities by the lakes landing sites and in the catchment area to mitigate the deteriorating environmental conditions. Naturally the situation calls for reversal to the increasing stress of the ecosystem. As a result, every water body surveyed put forward some mitigation suggestions
    Description: On title page: The Ugandan Version
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20179 | 4230 | 2016-02-25 15:41:36 | 20179 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Fresh water and fish are important to the people wholive in the Lake Victoria region therefore the quality ofthe water and fish is of major importance (Johnson &Odada, 1996). It is well known that dirty water and spoiltfish can lead to poor health and lower standards of living,and that quality can be affected by the pollution in theenvironment.Even though Lake Victoria is very large, it is relatively shallow and the water remains in the lake basin for a long time (Bootsma & Hecky, 1993). There are a number of environmental issues in Lake Victoria, including water hyacinth~over-population and increased farming causing problems with the lake ecosystem. All these factors combine to keep contaminants within the lake for long time, which will lead to gradually increasing concentrations in the lake.Pollution is a term that covers a wide variety of chemicals and physical changes and their adverse effects on the environment. Here we focus on contaminants, which are unwanted chemicals introduced to the environment. Contaminants include a very wide variety of chemicals, both man-made and natural, for example, mercury, pesticides and herbicides, heavy metals, and natural plant and algae toxins. Many contaminants do not always lead to adverse effects immediately, but can gradually induce long-term problems leading to chronic illnesses and physical damage. A few contaminants have very rapid impacts resulting in immediately obvious changes such as death or injury.Sources of contaminants are varied. Contaminants can get in the lake by the way of agricultural treatment of crops near the lake, industrial effluent, intentional introduction such as fish poisoning byfishermen, natural sources such as heavy metals from particular types of rocks, and even some plants naturally release their toxins. Contaminant sources are not always found near Lake Victoria.
    Keywords: Fisheries ; Pollution
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20231 | 4230 | 2016-02-26 15:53:45 | 20231 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Biological diversity of an ecosystem is considered a reliable measure of the state of health of the ecosystem. In Uganda's large lakes, the Victoria and Kyoga, the past three decades have been characterized by profound changes in fish species composition following the introduction of the piscivorous Nile perch (Oguto-Ohwayo 1990). Over 300 haplochromine cichlid species comprising a wide range of trophic groups were lost along with a host of non-cichlid fishes which occupied virtually all available ecological niches and in the lakes (Witte 1992). A second major ecological event has been the gradual nutrient enrichment of the water bodies (eutrophication) from diffuse and point sources, while at the same time pollutants have also gained entrance into the water systems in pace with indusfrial development and human population increases in the lake basins. Eutrophication and pollution have drastically altered the physical and-chemical character of the water medium in which different fauna and flora thrive. In Lake Victoria these alterations have resulted in changes of algal species composition from pristine community dominated by chlorophytes and diatoms (Melosira etc) to one composed largely of blue-green algae or Cyanobacteria (Microcystis, Anabaena, Planktolyngbya etc) (Mugidde 1993, Hecky 1993).
    Description: On title page: The Ugandan Version
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20235 | 4230 | 2016-02-26 16:42:05 | 20235 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Introduction of exotic fish species especially the Nile perch Lates niloticus, is believed to be responsible for the decline of fish species diversity in lakes Victoria, Kyoga and Nabugabo.About 60% of the haplochromine cichlids are thought to have become extinct from L. Victoria due to predation by the Nile perch. However there are many lakes satelite to the lakes Victoria and Kyoga basins which still have fish fauna similar to that of the main lakes. many of the satellite lakes are separated from the main lakes in, which Nile perch was introduced by extensive swamps that provide a barrier to Nile perch .A survey was carried out in a number of these satelite lakes and an inventory made of existing fish species. Their distribution and relative abundances were also determined. The lakes studied included Nawampasa, Nakuwa,Kawi Lamwa Gigate, Nyaguo, Agu, Nabugabo. Kayanja, Kaytigi, Mburo, Kachera and Wamala.Some habitats within the main lakes Victoria and Kyoga, especially those with rocky outcrops· and macrophyte cover that provide refugia for endangered species from Nile perch,were also surveyed) Various stations along the River Nile were also sampled to quantify the fish species that are still resent. Kyoga minor lakes were found to have the highest number offish species especially of haplochromine cichlids. Many haplochromine trophic groups that were thought to be extinct from 1. Victoria still occur in these lakes.!Some of the satellite lakes, especially lakes Kayugi, Mburo and Kachera still contain .healili populations of oreochromis. Iesculentus that could be used as brood stock in fish farming. Many of these lakes should .I ( Itherefore be protected for conservation offish species diversity
    Description: On title page: (The Ugandan Version)
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20247 | 4230 | 2016-04-04 11:43:03 | 20247 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: The results reported on were from a monitoring survey No. 10 undertaken between 23 rdand 29th April 2012 during construction period of the Bujagali Hydropower Project(BHPP). Two pre-construction, baseline surveys in April 2000 and April 2006 wereconducted and so far, during construction phase of the project, nine monitoring surveyshave been undertaken i.e. in September 2007, April 2008, April 2009, October 2009,April 2010, September 2010, April 2011, September 2011and the present one, in April2012. Since 2009 biannual monitoring surveys have been conducted at an upstream and adownstream transect of the BHPP with emphasis on the following aspects:water quality determinantsbiology and ecology of fishes and food websfish stock and fish catch including economic aspects of catch andsanitation/vector studies (bilharzias and river blindness)During this survey, baseline assessment of the above mentioned studies was conducted inthe reservoir behind the dam, including studies on algae, zooplankton and benthic macroinvertebrateswhich had been restrained since April 2008. The findings of baseline assessment of the reservoir are also contained in this report and are compared with thoseobtained from Transect 1(Upstream) and Transect 2 (Downstream).
    Keywords: Ecology ; Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20295 | 4230 | 2016-03-05 10:11:12 | 20295 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-09
    Description: The overall objective of the study was to develop a better understanding of how people perceived and responded to the fisheries management measures on Lake Victoria and were affected by them.
    Keywords: Fisheries ; Sociology ; Lake Victoria Fisheries Organization ; LVFO ; Implementation of a Fisheries Management Plan (IFMP)
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20296 | 4230 | 2016-03-05 10:14:21 | 20296 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-09
    Description: The purpose of the survey was to gain a better understanding of the role of factory agents in buying fish and setting prices, and of their place and role in fisheries co-management on Lake Victoria, Uganda.
    Keywords: Fisheries ; Lake Victoria Fisheries Organization ; LVFO ; Implementation of a Fisheries Management Plan (IFMP)
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20300 | 4230 | 2016-03-05 18:09:06 | 20300 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-09
    Description: Under the implementation of the fisheries management plan (IFMP) for LakeVictoria result area 4, bottom trawl monitoring surveys are undertaken tomonitor changes in the status of the fish stocks and environment of LakeVictoria. Trawl together with the lake-wide Hydroacoustic surveys give areflection on the status of fish stocks in the lake to guide managementdecisions The National working group for bottom trawl surveys in Ugandaundertakes these surveys within the Uganda sector of Lake Victoria. For thepurpose of this survey, the Uganda sector of Lake Victoria is divided intothree zones. A cruise lasting twenty days is conducted in two phases (twolegs) 13 days covering Zones I and II and 7 days in Zone III.
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
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    Format: application/pdf
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20301 | 4230 | 2016-03-05 18:03:06 | 20301 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-09
    Description: Source of the Nile Fish farm (SON) is located at Bugungu area in Napoleon Gulf, northern LakeVictoria. The proprietors of the farm have a collaborative arrangement with NaFIRRI to undertake quarterly environment monitoring of the cage site as is mandatory under the NEMA conditions. The monitoring surveys cover selected physical-chemical factors i.e. water column depth, water transparency, water column temperature, dissolved oxygen, pH and conductivity; nutrient status, algal and invertebrate communities (micro-invertebrates/zooplankton and macroinvertebrates/macro-benthos) as well as fish community. The second quarter survey for the calendar year 2015, which is the subject of this report, was undertaken in June 2015.Results/observations made are presented in this technical report along with a scientificinterpretation and discussion of the results with reference to possible impacts of the cage facilities to the water environment and aquatic biota.
    Keywords: Aquaculture ; Environment
    Repository Name: AquaDocs
    Type: monograph
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    Format: application/pdf
    Format: 56
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20154 | 4230 | 2016-02-25 13:19:24 | 20154 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Lake Victoria, besides being the second largest in theworld after Lake Superior, is the largest tropical lake. Itswaters are shared by Kenya (6% of the surface area),Uganda (43%), and Tanzania (51%). Before dramaticstructural and functional changes manifested in the lake'secosystem especially in the 1980s, fish life flourished inthe lake's entire water column at all times of the year.Currently, the situation is much more different from what it was in the past. The exponential increase in the introduced Nile perch (Lates niloticus) and Nile tilapia (Oreochromis niloticus) stocks, siltation, wetland degradation and eutrophication have characterised the lake ecosystem. The two exotic species and the small native cyprinid (Rastrineobola argentea) form the basis of the commercial fishery that was once dominated by two native tilapiines (Oreochromis esculentus and Oreochromis variabilis) and five other large-bodied endemic fishes. Severe deoxygenation observed at shallow depths (Ochumba 1990; Hecky et al., 1994) indicates that a large volume of the lake is unable to sustain fish life.The Lake Victoria catchment is one of the most densely populated areas in East Africa, encompassing a population of about 30 million people. Widespread poverty resulting from high inflation rates, lack of opportunities and general unemployment have characterised the lakeside communities over much of the last two decades.The biophysical environment in which Lake Victoria exists makes the lake particularly susceptible to changes that occur as a result of human modification to the watershed or the lake itself, thus rendering benefits from the lake unsustainable.
    Keywords: Fisheries
    Repository Name: AquaDocs
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20157 | 4230 | 2016-02-25 13:21:53 | 20157 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: As a fishery, the immensely large (c. 68,800 km2 ) LakeVictoria is a unique ecosystem which together with ariverine connection to the Lake Kyoga basin share acommon endemic "Victorian" fish fauna (Greenwood1966). Until the 1950s, the single socio economicallymost important species of fish in these two lakes wasthe native Oreochromis esculentus Graham (Graham1929) even though the lake also contained a secondnative tilapiine, 0reochromis variabilis , and over 300 other fish species (Beauchamp, 1956).
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 79-92
    Format: 321
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20161 | 4230 | 2016-02-25 13:04:02 | 20161 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Lake Victoria is the second largest lake in the world(69000km2) by surface area, but it is the shallowest (69mmaximum depth) of the African Great Lakes. It is situatedacross the equator at an altitude of 1240m and lies in ashallow basin between two uplifted ridges of the easternand western rift valleys (Beadle 1974). Despite theirtropical locations, African lakes exhibit considerableseasonality related to the alteration of warm, wet andcool, dry seasons and the accompanying changes inlucustrine stratification and mixing (Tailing, 1965; 1966;Melack 1979; Hecky& Fee 1981; Hecky& Kling,1981;1987; Bootsma 1993; Mugidde 1992; 1993).Phytoplankton productivity, biomass and species composition change seasonally inresponse to variations in light environment and nutrient availability which accompanychanges in mixed layer depth and erosion or stabilization of the metalimnion /hypolimnion (Spigel & Coulter 1996; Hecky et al., 1991; Tailing 1987). Over longer,millennial time scales, the phytoplankton communities of the African Great Lakes haveresponded to variability in the EastAfrican climate (Johnson 1996; Haberyan& Hecky,1986) which also alters the same ecological factors (Kilham et al., 1986). Recently, overthe last few decades, changes in external and or internal factors in Lake Victoria and itsbasin have had a profound inlluence on the planktic community of this lake (Hecky,1993; Lipiatou et al., 1996). The lake has experienced 2-10x increases in chlorophylland 2x increase in primary productivity since Tailing's observations in the early 1960s(Mugidde 1992, 1993). In addition to observed changes in the lake nutrient chemistry(Hecky & Mungoma, 1990; Hecky & Bugenyi 1992; Hecky 1993; Bootsma & Hecky 1993), the deep waters previouslyoxygenated to the sediment surface through most ofthe year are now regularly anoxic(Hecky et al., 1994).
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: book_section
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    Format: application/pdf
    Format: 145-152
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20163 | 4230 | 2016-02-25 13:36:26 | 20163 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Concerns have been raised over the sustainability ofthe fisheries resource base of Lake Victoria for sometime. The draft National Fisheries Policy states: "Thekey issues in the fisheries sector are resourcedepletion through overfishing aggravated by use ofdestructive fishing gear and methods" (MAAIF 2000).A fishery is said to be degraded if any or all of the indicators begin to show including decline in catches from the fishery, higher proportion of immature fish in the catch and reduction in the species composition of the catch. Inadequate implementation of fisheries management is considered the main cause of resource degradation. One of the factors identified as constraints to fisheriesmanagement has been lack of involvement of the resource users.
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 245-256
    Format: 321
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20174 | 4230 | 2016-02-25 15:29:55 | 20174 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: The study was undertaken to generate socio-economic information on fish market systems and performance of the industrial processing industry, which will guidethe processes leading to modernization of the fisheries sector and, sustainability of Lake Victoria fisheries.The main objective of this study was to evaluate the socio-economic implications of the fish marketing systems with particular emphasis on fish export market in Uganda. The study thus, analysed the socio-economic characteristics of fishers and examinined fish marketing systems and the impacts on the fishing activities, food security, employment opportunities and incomes of fisher-folk communities.
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 257-271
    Format: 321
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20172 | 4230 | 2016-02-25 15:48:23 | 20172 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Invertebrates constitute a major link in energy flowculminating into fish production in aquatic ecosystems. Intropical water bodies relatively little research has been done on invertebrate ecology especially their role in fishery production.European scientists through periodic expeditions to Africa in the last quarter of the 20th century carried out the earliest research on zooplankton. Rzoska (1957) listedthese early workers including Stuhlmann (1888), Weltner (1897) and Mrazek (1897-1898).Daday (1907), Verestchagin (1915) and Delachaux (1917) undertook further work during the early twentieth century. These earlyworks provide a useful basis for tracking community changes by comparison with modem investigations. Worthington (1931) provided the first quantitative account of the zooplankton of Lake Victoria along with information on diurnal vertical migrations, compared to a temperate lake. The establishment of the East African Freshwater Fisheries Research Organisation (EAFFRO) at Jinja in 1947 enabled investigations on the fisheries, algae, invertebrates and water quality aspects of the lake (EAFFRO Annual Reports 1947-1977) to be regularly carried out. Macdonald (1956) made the first detailed observations on the biology of chaoborids and chironomids (IakefJies) in relation to the feeding of the elephant snout fish, Mormyrus kannume. A detailed study of the biology of the mayfly, Povilla adusta Navas with special reference to the diurnal rhythms of activity was carried out by Hartland-Rowe (1957).The search to unravel the ecological role of aquatic invertebrates in the production dynamics of the lake has taken invertebrate research to greater heights through recent investigations including Okedi (1990), Mavut
    Keywords: Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 153-171
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20234 | 4230 | 2016-04-04 07:21:15 | 20234 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Aquatic macro-invertebrates encompass all those organisms that be seen with unaided eyes. Most macro-invertebrates are categorised as semi-aquatic in that they are aquatic in early stages, but live as terrestrial organisms as adults, while others like gastropods, bivalves, Oligochaetae, Hirudinae and ostracods are exclusively aquatic. Some of them such as mayflies lay eggs in water and subsequent stages also live in water until adulthood when they emerge to live a terrestrial life. In others, eggs are laid near the water, while some like members of Tendipedidae (midges) lay their eggs on the leaves of aquatic macrophytes and after hatching their larvae creep into water
    Description: On Title page: (The Ugandan Version)
    Keywords: Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 66-85
    Format: 90
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20242 | 4230 | 2020-08-30 23:52:40 | 20242 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Genetic biodiversity is the variation among individuals within and between units of interbreeding individuals (populations) of a species. It includes inheritable and transmittable differences that occur between individuals and/or populations of a given species through reproductive interaction. There exists enormous variability among individuals and/or populations of a species for most living organisms, and most of this variation is inheritable. differences among individuals arise through mutation and via recombination of genes during meiosis. These differences are then transmitted to successive generations through sexual reproduction and maintained in the populations through processes such as natural selection and genetic drift. Unfortunately much of this variation is normally threatened and often in danger of extinction because most focus in conservation of natural resources is put at saving species or habitats than varieties or strains of a species.
    Description: On Title page: The Ugandan version
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 128-131
    Format: 90
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20241 | 4230 | 2016-03-01 14:11:56 | 20241 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Cichlids are known for their explosive radiation especially in the African Great Lakes marked with a high level of lake endemism. These fishes have been characterized mainly along trophic and habitat differences, by variation in morphological structures such as teeth and jaws and by differences in body shape and coloration. Cichlids are important as a microcosm of macroevolution. The explosive radiation, young evolutionary scale, and the isolation of groups characterized with high levels of endemism and presence of living fossils makes the group important for evolutionary and genetic studies. Lake Victoria region cichlids which are isolated and relatively more recent in evolution were the last to be appreciated in their diversity. Recently Ole Seehausen has found scores of rock fishes in Lake Victoria which were up to then thought to be absent from the Lake and only known to occur in Lakes Malawi and Tanganyika.Greenwood put together the species groups of Lake Victoria, and later in the early 1980's revised the classification of haplochromine species to reflect the phyletic origin and interrelationship of the various groups in Lake Victoria region. Melan Stiassny has been interested in early evolution of cichlids while the likes of Paul Fuerst and Lees Kaufman and Axel Meyer have been interested and are working to explain the speciation mechanisms responsible for the explosive radiation and evolution of cichlids. LocallyS.B Wandera and his student Getrude Narnulemo are spearheading the biodiversity and taxonomic studies of cichlids in Lake Victoria region
    Description: On Title page: (The Ugandan Version)
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 130-134
    Format: 175
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20246 | 4230 | 2016-02-26 17:03:44 | 20246 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Biodiversity values provide objective data and advice from which policy makes could assess the conservation options and determine optimal policies that would balance the needs of conservation with the socia-economic needs of the people in the area.
    Description: On Title page: The Ugandan version
    Keywords: Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 164-168
    Format: 90
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20249 | 4230 | 2016-03-01 14:17:26 | 20249 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Source of the Nile (SON) Cage Fish farm is located at Bugungu in Napoleon Gulf, northern Lake Victoria, near the headwaters of the River Nile. NaFIRRI has, through a Public-Private collaborative partnership with SON management, undertaken quarterly monitoring of the cage fish farm since 2011. The objective of the environment monitoring is to track possible environment and biological changes as a result of fish cage operations in the area. The agreed study areas cover selected physical-chemical parameters i.e. water depth, transparency, column temperature, dissolved oxygen, pH and conductivity; nutrient status; and biological parameters i.e. algae, zooplankton, macro-benthos and fish communities. The fourth quarter survey, which is the subject of this report was undertaken during December 2015. Results/observations made are presented in this technical report along with a scientific interpretation and discussion of the results with reference to possible impacts of the cage facilities to the water environment and aquatic biota.The present report presents field observations made for the fourth quarter survey undertaken in December 2015 and provides a scientific interpretation and discussion of the results with reference to possible impacts of the cage facilities to the water environment and the different aquatic biota in and around the fish cage site.
    Keywords: Aquaculture ; Environment
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 42
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20257 | 4230 | 2020-09-15 07:39:11 | 20257 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-09
    Description: Most fish in Uganda comes from lakes Victoria, Albert, Kyoga, Edward, George, about 160 minor lakes and rivers. Fish production of most lakes in Uganda has changed considerably since development of most of the fisheries started during the first half of the 20th century. Analysis of the changes that have taken place in these fisheries provides useful information on the potential and management issues associated with fisheries in Uganda. Total national fish catch statistics are not available for the period prior to 1960. The trends in total fish production from the different water bodies between 1961 and 1995 are illustrated in Figure 3. Total fish catches were 60,000 to 71,000 metric tonnes between 1961 and 1965 and increased after 1965 reaching a peak of 245,000 metric tonnes in 1990. The increase from 1965 to the late 1970s followed establishment of introduced Nile perch and Tilapiines to Lake Kyoga which reached a peak in 1978 and then declined. The second peak followed establishment of the same introduced species in Lake Victoria. This too peaked in 1990 after which catches declined. During I970s, most of the fish came from Lake Kyoga while during the 1980s it was from Lake Victoria. Although the above trend shows an increase in total fish catches, historical trends in fisheries have been of decreasing catches especially of more desirable species. This impression can only be appreciated through examination of historical changes in individual fish production systems. The trend in total catches from major water bodies is illustrated in Figure 4. A brief analysis of the fish stocks and fish production from the different water and the efforts to manage the fisheries of the major lakes is given.
    Description: On title page: (The Ugandan Version)
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 1-13
    Format: 13
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20269 | 4230 | 2020-09-04 01:44:46 | 20269 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-09
    Description: Before the introduction and establishment of the Nile perch, Lates nilolicus (L). Lakes Victoria and Kyoga had a diverse fish fauna, dominated by haplochromine cichlids. The haplochromines had evolved into many trophic groups which occupied virtually all trophic levels and contributed to the ecological efficiency of the lakes. Establishment of Nile perch in the main lakes was followed by a decline and in some cases complete disappearance of many haplochromine trophic groups. This is thought to have affected the efficiency of the ecosystem. This study examined the species composition and trophic diversity among haplochromines in Kyoga Minor lakes where Nile perch was not introduced and compared this with historical data from Lake Victoria. Six Kyoga Minor lakes and the main Lake Kyoga (Iyingo) were sampled. Forty one haplochromine species were recorded in the Kyoga lake basin and only fourteen species were recorded from the main Lake Kyoga. Species and trophic diversity of haplochromines were highest in the Kyoga Minor lakes as compared to Lake Kyoga.
    Description: On title page: (The Ugandan Version)
    Keywords: Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 110-128
    Format: 171
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20458 | 4230 | 2016-04-15 11:25:42 | 20458 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-10
    Description: This report presents findings of the CAS conducted in the Ugandan waters of Lake Victoria in March 2010. The results of the previous ten CASs conducted under the same programme in July, August, September and November 2005; in March, August and December 2006; in March, and August 2007; in February and December 2008 are included to show the emerging trends. The report also presents total annual catch estimates for the Ugandan part of the lake from 2005 to 2010.
    Description: Implementation of a Fisheries Management Plan (IFMP) Project for Lake Victoria
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 43
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20294 | 4230 | 2016-03-05 09:10:39 | 20294 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-09
    Description: In September 2007, the National Fisheries Resources Research Institutecarried out a socio-economic survey on Governance in Co-Management in the fisheries of Lake Victoria. The purpose of the study was to determine the nature and performance of governance of the fisheries resources through co-management structures and systems.
    Keywords: Fisheries ; Lake Victoria Fisheries Organization ; LVFO ; Implementation of a Fisheries Management Plan (IFMP)
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 89
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20297 | 4230 | 2016-03-05 10:17:13 | 20297 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-09
    Description: The purpose of the Socio-economic Baseline Survey of the Fishing Communities was to provide information on the fish landing beaches, people involved in fisheries, their livelihood activities and facilities available to them.
    Description: Implementation of a Fisheries Management Plan (IFMP) Project
    Keywords: Fisheries ; Sociology
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 118
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20298 | 4230 | 2016-03-05 10:19:24 | 20298 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-09
    Description: The purpose of the study was to provide an in-depth understanding of information generation, flow and utilization within Uganda’s regional fish trade. The study was carried out at district headquarters, border points, landing sites and border markets, involving DFOs, Customs Officials, BMU executives and market managers.
    Description: Implementation of a Fisheries Management Plan (IFMP) Project
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 31
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20302 | 4230 | 2016-03-06 09:41:03 | 20302 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-09
    Description: This monitoring survey No. 11 undertaken between 4th and 9th September 2012 is the second one to be conducted after completion of construction of Bujagali HydropowerDam. Two pre-construction baseline surveys in April 2000 and April 2006 were conducted and during construction phase, eight monitoring surveys (September 2007,April 2008, April 2009, October 2009, April 2010, September 2010, April 2011, September 2011) were conducted.
    Description: Carried out on behalf of Bujagali Energy Limited (BEL)
    Keywords: Environment ; Fisheries
    Repository Name: AquaDocs
    Type: monograph
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    Format: application/pdf
    Format: 40
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20317 | 4230 | 2016-03-10 07:54:32 | 20317 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-09
    Description: Lake Albert contributes about 10% to the national fish production. It supports a multi-species fishery based on endemic species. To local fishermen, Lake Albert is a lifeline providing food and income.
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 6
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20448 | 4230 | 2016-04-11 08:10:21 | 20448 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-10
    Description: A comprehensive Frame survey was carried out on lakes Kwania, Bisina, Nakuwa, Kyoga and other minor lakes in the Lake Kyoga Basin in June 2008 (Figure 1). The Frame survey was coordinated by the Department of Fisheries Resources (DFR) in collaboration with the National Fisheries Resources Research Institute (NaFIRRI) in terms of technical support. The riparian districts through the sub-county fisheries offices and the BMUs provided the enumerators and supervisors. The frame survey captured all the important characteristics of the fisheries and facilities supporting the fisheries and thus provides a strong baseline for future reference of management interventions in the basin.
    Description: On title page: THEME 3: Enhancing Integrated Management of Natural Resources. Project: Determination of Appropriate Technologies and Methods for Harvesting and Conservation of Fish Species And Stocks in Lake Albert/Albert Nile and Kyoga Basin Lakes. ARTP II (Extension)
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 20
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20447 | 4230 | 2016-04-09 16:56:16 | 20447 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-10
    Description: Lake Wamala, a small lake (180 km2) located in Central Uganda and believed to have been part of the main Lake Victoria and only got separated about 4000 years ago, has already undergone different levels of fisheries evolution that warrant using it as a case study to inform changes in other systems. Using resources provided by the Lake Victoria Environmental Management Project (LVEMP) II, under the Applied Research Facility, we evaluated the fishing inputs, socio-economic infrastructure and analyzed trends in fishery benefits to guide evolution of management advice.A frame survey was conducted on the entire lake (13th - 23rd March 2012) enumerating all fishing factors and enlisting available and accessible socio-economic infrastructure along the shores of the lake. The lake traverses districts (Gomba, Mityana, and Mubende) with its largest portion lying in Mityana. There are 26 established fish landing sites and about 600 fishers with a similar number of boats on the lake. The total number of boats on the lake is almost equal to the number of fishers; illustrating the common type (paracute) and size (Small, about 4 m) of boats and hence a fishing crew structure of one fisher per boat. Main fishing gears are Gillnets targeting the tilapia (Ngege) and long line hooks (Protperus, Mamba, and Clarias, Male). Almost equal number of boats used the two main gears on the lake (about 300 each). 97% of the gill nets on the lake are small (3.5” (8.9 cm – 4.5” – 11.4 cm) stretched mesh size while 98% of the hoots are large (〈 size 10). The implication is gill net fishers target small tilapia while long line fishers aim at the large mamba and male. Generally the lake has poor socio-economic infrastructure compared to other lakes of Uganda probably due to its geo-morphological setting. The lakes fishing factors have continued to expand with the ever increasing population. There may be need to check the continued entry into the fisheries especially if the increasing effort does not translate into increase in fishery yield.
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20451 | 4230 | 2016-04-11 08:16:42 | 20451 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-10
    Description: The fisheries resources of Lakes Albert and Kyoga present a high potential for economic growth, food, employment and foreign earnings. However, livelihoods appear to be compromised with the emergence and rapid spread of HIV/AIDS in the fisher communities of L. Albert and Kyoga. HIV/AIDS is considered a silent epidemic that is unique, posing a great challenge to the fisheries managers, health service providers, development planners and the resource users themselves. Fishers have high HIV prevalence, as well as AIDS-related illnesses and mortality rates. The high HIV prevalence rates among the fishing communities in Uganda is between 10-40% compared to the national rates which lie between 6% and 7%. This indicates that the national programmes have not adequately addressed the plight of the fishing communities of Lakes Albert, and Kyoga and the consequences have been devastating. Men and women living in fishing villages across the world have been found to be between five and ten times more vulnerable to the disease than other communities (Tarzan et al 2005, FAO, 2007). The present prevalence rates among the fishing communities stands at 10 to 40 % (LVFO, 2008). Meanwhile the same fishing communities are the essential labour for the Lakes’ fishery industry which is thriving nationally and internationally. That resource potentially can alleviate poverty and the HIV/AIDS threat. Fishing communities are the hidden victims of the disease, mixing patterns with the general population could act as a reservoir of infection that could spill over into the general population to drive the epidemic. On L. Albert, a quarter of the fisher folk were HIV-positive by 1992 compared to 4% in a nearby Agricultural village. Since then, there have been no targeted studies to address or monitor the prevalence rates eight years later, yet the multiplicity factor is high.HIV/AIDS can be linked to unsustainable fisheries, as the labour force available would not go to deep waters to fish, instead would fish in the shallow waters as a coping mechanism. A further effect is the loss to National and local economies and reduced nutritional security for the wider population. HIV/AIDS remains a significant challenge that has created a mosaic of complexity in the fishery sector. This needs to be addressed. It is, therefore, paramount that a comprehensive study was under taken to address this pandemic and the phenomenon of HIV/AIDS based on the study objectives.1. To determine the trend in HIV/AIDS infection among fishing communities and the factors affecting it2. To assess the impacts of HIV/AIDS on fish production and the implications for fisheries management.
    Keywords: Fisheries ; Health
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20445 | 4230 | 2016-04-09 16:52:36 | 20445 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-10
    Description: Lake Wamala is one of the small lakes in Uganda, and lies between latitudes 0o 15; and 0o 25' N 31o 45' to longitude 32o 00' E, longitude and at an altitude of 1000m above sea level. Following ths 1961 heavy rains the lake expanded from about 100 to 118 sq. km and the swamps covered almost 60 sq km (Okaranon 1993). This lake was first stocked with Oreohromis niloticus eduardianus populary known as Oreohromis niloticus then Oreochromis leucostictus and then Tilapia zillii then after that it was officially opened for commercial fishing in 1960. Despite of the commercial fishery there used to be subsistance fishing that was mainly by the use of wires and hooks and targeted the Clarias and Protopterus species. The lake fishery used to be highly profitable after the opening in 1960; though in 1970s the fishers started complaining of the declining state of the fishery. At that time the O. niloticus had gone down to less than 1 kg per net per night by 1975(Okaranon 1993). Due to it led to scientists undertake fisheries surveys in 1975/78 and later 1988/92 then later on there subsquent survey in 2003. Since that time there has been no work done until March 2012 that both catch assessment and frame surveys undertaken to ensure that management issues are addressed concerning this riparian water body. The main objectives of the survey were:-To assess fish production levels in the commercial fisheries of Lake Wamala (Catch Assessment).To assess the fishing effort and facilities available at the fish landings that supports the fisher folks.
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20453 | 4230 | 2016-04-11 08:22:23 | 20453 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-10
    Description: Invertebrates are some of the key food items for fish diets. They thus form an important fish food environment upon which the fisheries thrives in terms of production through dietary support. Invertebrates communities of Lakes Albert and Kyoga have been evaluated and considered the implications for diets and production of commercial fishes.
    Keywords: Ecology ; Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20643 | 4230 | 2018-10-21 09:46:56 | 20643 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-11
    Keywords: Aquaculture ; Environment
    Repository Name: AquaDocs
    Type: monograph
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20672 | 4230 | 2016-05-21 17:58:57 | 20672 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-11
    Description: The results reported on were from a monitoring survey No. 9 undertaken between 9th and 12th September 2011 during construction period of the Bujagali Hydropower Project (BHPP). Two pre-construction, baseline surveys in April 2000 and April 2006 were conducted and so far, during construction phase of the project, eight monitoring surveys have been undertaken i.e. in September 2007, April 2008, April 2009, October 2009, April 2010, September 2010, April 2011 and the present one, in September 2011. Since 2009 biannual monitoring surveys have been conducted at an upstream and a downstream transect of the BHPP with emphasis on the following aspects:water quality determinants biology and ecology of fishes and food webs fish stock and fish catch including economic aspects of catch and sanitation/vector studies (bilharzias and river blindness)in addition to the above mentioned studies, a soil pH survey was undertaken on 15th October 2011 in the area behind the reservoir whose filling started a week earlier. The findings of pH status in the catchment of the dam are also contained in this report.
    Keywords: Environment ; Fisheries
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    Type: monograph
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20696 | 4230 | 2016-05-31 09:19:58 | 20696 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-12
    Description: A comprehensive Frame survey was carried out by the National Fisheries Resources Research Institute (NAFIRRI) in Lake Albert in January 2007. The frame survey captured the main characteristics of the fisheries and facilities supporting the fisheries and provides baseline information for reference of other studies as well as management interventions.
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20694 | 4230 | 2016-05-31 09:14:26 | 20694 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-12
    Description: A baseline survey of the fishing communities wasconducted in 2005/06 as one of the main studies underthe Socio-economic Research and Monitoring WorkingGroup on Lake Victoria. The overall objective of thesurvey was to provide a deeper understanding of thebroad socio-economic characteristics and well being ofthe different stakeholder groups immediately dependenton the Lake Victoria fisheries. An understanding of socioeconomic status of the fishery primary stakeholders, who include fishers, artisanal processors and traders, isessential for any subsequent periodic evaluation ofdevelopment. During the survey, a total of 1,235respondents were interviewed, at 34 landing sites in allthe Ugandan districts on Lake Victoria.The purpose of this fact sheet is to provide informationon the fish landing beaches, people involved in fisheries,their livelihood activities and facilities available to them.
    Keywords: Fisheries ; Sociology
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20697 | 4230 | 2016-05-31 09:24:27 | 20697 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-12
    Description: Nile tilapia (oreochromis niloticus) a fish introduced into Lake Victoria to boost the fishery industry after the Nile perch lates niloticus fed on the native tilapiine oreochromis esculentus and Oreochromis viabillis to almost extinction has been proposed to be cultured in the Lake Victoria. The fact sheet explains the culture of Nile tilapia in cages in Lake Victoria, Uganda.
    Keywords: Aquaculture ; Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20718 | 4230 | 2016-06-01 14:52:43 | 20718 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-12
    Description: The National Fisheries Resources Research Institute (NAFIRRI), the Department of Fisheries Resources (DFR) and the districts in and around Lake Victoria jointly conduct Catch Assessment Surveys (CAS) with a major objective of providing information on the magnitude of fish catches in the lake. Fisheries contribute as high as 12% to Uganda's GDP. Catch assessment surveys are some of the avenues used to collect information for monitoring fish population dynamics as well as the magnitude, distribution and trends of fishing effort and fish catches. They are necessary for making sound decisions for the management of Lake Victoria fisheries. This information provides the Catch Per Unit ofEffort (CPUE). The CPUE is used together with frame survey data to estimate total fish catches.
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20814 | 4230 | 2016-06-18 08:57:26 | 20814 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-12
    Description: 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.
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20821 | 4230 | 2016-06-18 09:58:45 | 20821 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-12
    Description: 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.
    Keywords: Fisheries ; Sociology
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20816 | 4230 | 2016-06-18 09:00:50 | 20816 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-12
    Description: 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.
    Keywords: Fisheries
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    Type: monograph
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20933 | 4230 | 2016-07-24 07:50:29 | 20933 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-13
    Description: 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.
    Keywords: Environment ; Fisheries
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    Type: monograph
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20932 | 4230 | 2016-07-24 07:47:59 | 20932 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-13
    Description: 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.
    Keywords: Agriculture ; Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20931 | 4230 | 2016-07-24 07:51:39 | 20931 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-13
    Description: 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.
    Description: Issue 1, Vol. I (Series name not specified)
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20165 | 4230 | 2016-02-25 15:44:43 | 20165 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: The study was done in six districts of Mukono, Jinja, Iganga, Bugiri, Busia and Kalangala. At both mainland shoreline and islands, 271 adult respondents were randomly selected from 17 landing sites of Lake Victoria over a four months period between October 2000 and January 2001. A questionnaire was administered for symptoms of schistosomiasis and samples of stool, urine and blood were taken from respondents. Stool and urine were analysed for schistosome eggs and blood.Blood was analysed for increased eosinophils. Snail samples were collected from various depths along the shoreline of study sites identified and screened for schistosome cercariae.
    Keywords: Fisheries ; Health
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    Format: application/pdf
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    Format: 279-284
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20164 | 4230 | 2016-02-25 15:17:22 | 20164 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: We examined socio-economic variables that contribute to malnutrition in selected communities in the Lake Victoria basin during 2001. The study was carried out innine districts and hinterland communities up to 25 km awayfrom the beach were used as the reference population. The main variables examined were: feeding habits, income and intra-household food distribution and living standards. Others included disease and health, sanitation and hygiene, childcare and mothers' age and workload, weaning practices, agricultural production and food availability, careduring pregnancy and food taboos.
    Keywords: Fisheries ; Sociology
    Repository Name: AquaDocs
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    Format: application/pdf
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    Format: 273-278
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20175 | 4230 | 2020-09-07 19:13:37 | 20175 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Lake Victoria in East Africa, supports socio-economicallyimportant fisheries for more than 30 million inhabitants inthe lake basin. The lake had until the 1970's a diverse fish assemblage dominated by haplochromines species whichformed at least 83% of the fish biomass (Kudhongania &Cordone 1974). The more than 500 haplochrominespecies in Lake Victoria, over 99% of them endemic,exploited virtually all the food sources in the lake (Witte and van Oijen 1990).Each species had its own unique combination of food and habitat preference (Goldschmidt et al., 1990).
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20176 | 4230 | 2016-02-25 15:36:18 | 20176 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: The initial subsistence fisheries of Lake Victoria were dominated by two indigenous tilapiines, Oreochromis esculentus (Graham 1929) and Oreochromis variabilisBoulenger 1906, exploited with simple fishing crafts and gears that had little impact on the fish stocks (Jackson 1971). Commercial fisheries, targeting the tilapia fishery,started at the beginning of the 20th Centurywhen cotton flax gillnets were first introduced in 1905 into the Nyanza Gulf in Kenya. Gillnets were quickly adopted around the whole lake and consequently, the native methods of fishing soon died out (Jackson 1971).Following the introduction of gillnets, fishing boats and their propulsion methods were also improved. These improvements in fishing capacity coincided with developmentof urban centres and increasing human population around the lake, which increased the demand for fishery products. To satisfy the increasing demand, fishing effort increased greatly during the 20th century, despite the decline of catch per unit of effort (CPUE) (Jackson 1971; Ogutu-Ohwayo 1990). The initial catch rates of 127mm (5 inch) mesh size gill nets in the tilapia-based fishery, in 1905, was in the range of 50 to 100 fish per gillnet of approximately 50 m in length. However, twenty years later, the catch rates of gillnets of the same mesh size had declined to about six fish per net and gillnets of smaller mesh sizes, which had better catch rates, had been introduced suggesting overfishing (Worthington and Worthington, 1933).
    Keywords: Fisheries
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    Format: 49-64
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20243 | 4230 | 2020-09-04 01:32:47 | 20243 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: Before introduction and establishment of the Nile perch Lales nilolicus, haplochromines were the most abundance group of fishes in Lake Victoria, Kyoga and Nabugabo. They formed at least 83%, by weight of the fish biomass in Lake Victoria up to early 1980s (Kudhongania & Cordone 1974, Okaronon el ai, 1985). They occupied virtually all trophic levels and played an important role in the flow of organic matter in these ecosystems. Each species had its own unique combination of food and habitat preference (van Oijen 1982, Goldschmidt el al 1990). Up to eleven trophic groups were identified in the Mwanza Gulf van Oijen op cit.). These included; phytoplanktivores, detritivores, algal grazers, plant eaters, molluscivores, parasite waters,phyoplanktivores, insectivores, piscivores, paedophages, and scale eaters. The detritivorous phytoplanktivores and the pelagic phytoplanktivores together constituted about 50% of the total haplochromine biomass in the lake (Goldschmidt 1986, Witte & van Oijen 1990).
    Keywords: Biology ; Ecology ; Fisheries
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    Format: 132-163
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20070 | 4230 | 2016-02-23 09:46:15 | 20070 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-07
    Description: Source of the Nile Fish farm (SON) is located at Bugungu area in Napoleon Gulf, northern Lake Victoria. The proprietors of the farm requested for technical assistance of NaFIRRI to undertake regular environment monitoring of the cage site as is mandatory under the NEMA conditions. As the SON is a key collaborator/client of the institute, NAFIRRI agreed to undertake the assignment subject to facilitation by the client. The institute agreed to conduct quarterly surveys of key environmental parameters at the site including selected physical-chemical and biological factors, nutrient status, column depth, water transparency and sedimentation. Samples and field measurements were to be taken at 3 sites: within and/or close to the fish cages (WIC), upstream (USC) and downstream (DSC) of the cages. The first environmental monitoring survey was undertaken in February 2011; the second in May 2011 and the third in September 2011. The surveys cover physical-chemical parameters, nutrient status, invertebrate and fish communities. The present report presents field observations made for the fourth quarter survey undertaken in November 2011 and provides a scientific interpretation and discussion of the results with reference to possible impacts of the cage facilities to the water environment and the different aquatic biota at and around the cage site including natural fish communities.
    Keywords: Aquaculture ; Environment
    Repository Name: AquaDocs
    Type: monograph
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20316 | 4230 | 2016-03-10 07:51:53 | 20316 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-09
    Description: Fishing using light to attract fish (The light fishery) wasintroduced on Lake AIbert from Lake Victoria where it isused to catch mukene Rastrineobola argentea. The light fishery on Lake Albert targets ragoge brycinus nurse and mukene/muziri (Neobola bredoi), These species species now contribute to more than 50% of the catches from this lake.Ragoge and muziri were until the early 1990's notimportant in the commercial fishery but only served asfood to the large predatory fish species that formed thebasis of the fishery.
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20329 | 4230 | 2016-03-10 08:13:29 | 20329 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-09
    Description: 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 the current CAS activities from July 2005 to May 2011. So far there have been 14 CASs conducted in the Uganda sector of the lake. The report also compares the annual catch and gross beach value of the catch in 2005, 2006, 2007, 2010 and 2011.
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20334 | 4230 | 2016-03-10 08:51:19 | 20334 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-09
    Description: Research was done to assess the dissemination and implementation by the Fisheries Department, Local Govemments and beach management units and the awareness, acceptance and compliance among fishers to the CoM Directives on management of Lake Victoria fisheries. Conducted by the National Fisheries Resources Research Institute (NaFIRRI), the research focused on the implementation and effectiveness of measures following the LYFO Council of Ministers (CoM) Directives for improved management of the fisheries of Lake Victoria, with particular reference to the 2009 CoM Directives as a case study, it was established that many of the Directives have not been implemented. In cases where the directives were implemented, their effectiveness remains questionable.While steps were taken to disseminate and implement the Directives, there were some challenges, including the unclear legal status of the directives, limited dissemination materials and poor methods of dissemination,language barriers and inadequate resources for enforcement.
    Keywords: Fisheries ; Lake Victoria Fisheries Organisation (LVFO)
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20409 | 4230 | 2020-10-26 04:01:23 | 20409 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-09
    Description: Reforms in Uganda's agricultural research system have been undertaken In accordance with the national policy frameworks, in particular,the Poverty Eradication Action Plan (PEAP) and the Plan for Modernisation of Agriculture (PMA). These reforms have led to the establishment of semi-autonomous Public agricultural Research institutes (PARis) within the National Agricultural Research System (NARS). The PARis were created from institutes formerly under the old NARO structure and comprise of the National Agricultural Research Institutes (NARis) and the Zonal Agricultural Research Institutes (ZARDls). The National Fisheries Resources Research Institute (NAFIRRI) formerly FIRRI was established as one of the NARis to spearhead basic and applied research of strategic importance to Uganda in fisheries and water environment. The mandate of NAFIRRI is "to undertake strategic research of national importance in aquaculture, capture fisheries, water environment,socio-economics and marketing; and to develop and manage research, and disseminate the technologies in partnership with relevant stakeholders.
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20430 | 4230 | 2016-05-21 17:57:04 | 20430 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-10
    Description: Bujagali hydropower dam construction is now completed and a reservoir behind the dam has been created, extending all the way up to Kalange-Makwanzi, an upstream transects. During the 10th monitoring survey-April 2012, a third transect was established in the mid of the reservoir where it runs up to 30 m deep and sampled similarly as at the two original sampling transects, Kalange-Makwanzi and Buyala-Kikubamutwe for comparative purposes. This monitoring survey No. 12 undertaken between 25th and 30th April 2013 is the third one to be conducted after completion of construction of Bujagali Hydropower Dam. Two pre-construction baseline surveys in April 2000 and April 2006 were conducted and during construction phase, eight monitoring surveys (September 2007, April 2008, April 2009, October 2009, April 2010, September 2010, April 2011, September 2011) were conducted. Since 2009 biannual monitoring surveys have been conducted at an upstream and a downstream transect of the BHPP with emphasis on the following aspects: water quality determinants, biology and ecology of fishes and food webs, fish stock and fish catch including economic aspects of catch and sanitation/vector studies (bilharzias and river blindness). In the post-construction monitoring surveys, the assessments of algae, zooplankton and benthic macro-invertebrates which had been restrained since April 2008 were also included.
    Keywords: Ecology ; Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20462 | 4230 | 2016-04-15 11:44:56 | 20462 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-10
    Description: The specific objectives were to:WATER QUALITY1. To measure the water physical variables as indicators of environmental conditions in the upstream and downstream transects of Kalange (1) and Buyala (2), respectively,2. To determine the concentrations of total suspended solids as a major constituent likely to be released into the waters at any time during the construction activities, by comparing the concentrations at the two transects.FISH CATCH1. To follow up trends in fish catch as construction activity progresses, and to precision of the estimate;2. To estimate the prevailing fish catch rates, total fish catches and the total value of the fish catch to the local fishers at the two transects.
    Description: On title page: Environmental and Social Impact Monitoring of the Bujagali Hydropower Project (BHPP), Uganda Fisheries Component
    Keywords: Environment ; Fisheries ; Limnology
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20440 | 4230 | 2016-04-07 07:51:42 | 20440 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Keywords: Environment ; Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20438 | 4230 | 2016-04-07 07:48:19 | 20438 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-08
    Description: This report presents findings of the CAS conducted in the Ugandan waters of Lake Victoria in March 2006. The results of the CASs in July, August, September, and November 2005 are also included to show the emerging trends. The findings indicate stable production of Nile perch and tilapia but large fluctuations in the Mukene fishery. The estimates from the March 2006 data show a monthly catch of 12,360.2 t worth shs12.8 billion of direct gross income to the fishers. Out of this, 36% (4479.4 t) of the catch was Nile perch which was worth shs 9.3 billion (73%) of the direct gross revenue of the fishers. The catches of tilapia contributed 19% of the total catch and 18% of the gross revenue from the catches at the beach. The catches of Mukene, a low value fish, contributed 44% of the weight of the total catches but yielded only 8% of the estimated gross income of fishers.
    Description: Implementation of a Fisheries Management Plan (IFMP) Project for Lake Victoria
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/26053 | 4230 | 2018-10-21 09:52:16 | 26053 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-24
    Description: 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.
    Keywords: Aquaculture ; Environment ; Limnology ; Pollution
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/26063 | 4230 | 2018-10-21 11:13:50 | 26063 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-24
    Description: 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.
    Keywords: Aquaculture ; Environment ; Limnology ; Pollution
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/19343 | 4230 | 2020-09-07 22:11:26 | 19343 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-06-26
    Description: The theme of this Workshop is "Towards empowering Fisheries Officers to manage the fish stocks, biodiversity and environment of Kyoga basin lakes", This theme embodies' a process whose main objective is to equipping Fisheries Officers in the districts surrounding the Kyoga basin lakes with the knowledge essential for the monitoring and management of the fisheries, biodiversity and environment of the lakes in that basin. The purpose of this workshop, therefore, is to contribute to this process by defining priority resemch-related issues of the theme so as to chart a way forward. This presentation introduces those issues and how the theme and objectives of the workshop fit into the Medium Term Plan of the Fisheries Resources Research Institute (FIRRI) within the context of the-umbrella MTP of the National Agricultural Research Organisation (NARO).
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/19460 | 4230 | 2020-09-07 22:22:55 | 19460 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-06-29
    Description: Kabaka's lake (c. 0.7 km2) is a reservoir in Kampala's low lying Ndeeba zone which was created from a wetland landscape during the reign of the Buganda King Mwanga (1884 -1899). Oral accounts suggest that the original aim of constructing the lake was to improve navigation from the King's palace to the nearby Lake Victoria. This objective was never fulfilled due to subsequent political and socio-economic travels in Uganda: Even at present, the commercial and residential interest in the land associated with the present heavy settlements and modified landscape, makes it unlikely that the original objective of the Kabakas will be achieved. However, the reservoir has since remained in the King's estate and is still known as Kabaka's lake
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17341 | 4230 | 2016-02-23 10:17:51 | 17341 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-11
    Description: Lake Nakuwa is one of the large lakes among the Kyoga drainage system lakes, located 132 km north east Off Jinja town, at 01° 091N 33° 21 1 E, an elevation 1037 m, surface area of 200 km2 and an average depth of 3.3 m. The lake is shared by the districts of Kamuli, Pallisa and the newly created district of Kaliro. howerever 80% of the landing sites arein Kaliro and less than 20% are shared between the districts of Kamuli and Pallisa.The lake is free of submerged and floating macrophytes, with lots of floating papyrus (sudds). Papyrus, hippo grass and reeds dominate the shoreline vegetation. Lake Nakuwa like the main lake Kyoga was stocked with the Nile perchand the tilapiine species namely Oreochromis niloticus, Oreochromis leucostictus and Tilapia zillii in thegeneral stocking exercise of small lakes alild dams in the early 1970's.
    Description: On title page: Theme 3: Enhancing intergrated management of natural resources Project : Generation of knowledge and technologies that ensure sustainable utilisation of fish stocks (capture fisheries) ARTP 2
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17354 | 4230 | 2016-02-19 08:57:04 | 17354 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-11
    Description: Source of the Nile Fish farm (SON) is located at Bugungu area in Napoleon Gulf, northern Lake Victoria. The proprietors of the farm and the National Fisheries Resources Research Institute (NaFIRRI) have an established collaborative arrangement where NaFIRRI provides technical back-stopping to enable quarterly environment monitoring of the cage site; a mandatory requirement of the National Environment Management Authority (NEMA). The agreed studyareas are physical-chemical factors (water depth, water transparency/secchi depth, water temperature, dissolved oxygen, BOO, pH, conductivity), and selected nutrients), algal community (including primary production), aquatic invertebrates (zooplankton and macrobenthos) and the fish community. This report presents field observations made during the third quarter (July-September) field survey undertaken during August 2014; along with scientificinterpretation and discussion of the results in reference to possible impacts of the cage facility to the water environment quality and aquatic biota.
    Keywords: Aquaculture ; Environment ; Source of the Nile Fish Farm (SON)
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17362 | 4230 | 2016-02-23 09:13:07 | 17362 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-11
    Description: Source of the Nile Fish farm (SON) is located at Bugungu area in Napoleon Gulf, northern Lake Victoria. The proprietors of the farm requested for technical assistance of NaFIRRI to undertake regular environment monitoring of the cage site as is mandatory under the NEMA conditions. NAFIRRI agreed to undertake quarterly environment surveys in the cage area covering selected physical-chemical factors Like water column depth, water transparency, water column temperature, dissolved oxygen, pH and conductivity; nutrient status, algal and invertebrate communities (microinvertebrates/zooplankton and macro-invertebrates/macro-benthos) as well as fish community. The first quarter survey was undertaken in February 2011; the second in May 2011 and the third quarter survey, which is the subject of this report, in September 2011. Results/observations made are presented in this technical report along with a scientific interpretation and discussion of the results with reference to possible impacts of the cage facilities to the water environment and aq-uatic biota, including the natural fish community at and around the cage site.
    Keywords: Aquaculture ; Environment
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17373 | 4230 | 2020-10-26 05:05:10 | 17373 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-11
    Description: Fisheries are very important to Uganda's economy. Besides its contribution toforeign exchange and employment, about 60% of the people mostly the-ruralpoor depend on fish protein to supplement on their diet. With growing fishingpressure and human activities on large lakes: Victoria, Kyoga, Albert and George,the fisheries are already showing signs of overexploitation and mismanagement.Lake Victoria basin has very important 4-5 satellite lakes constituting LakeNabugabo the largest of all and believed to have formed when the water level ofLake Victoria fell and a sand bar separated a portion of Lake Victoria about 4,000years ago. The rest of the lakes (Kayanja, Kayugi and Mariywa) are in the samedrainage basin, and are thought to have formed in the same way. Over the years,these lakes (that support important fisheries and other economic activities besides socio-cultural values) and their surrounding environments have been upon as a result of human activities. The fish stocks and species diversity of the lakes are declining very fast and this will threaten the as well. Despite their importance, however, these lakes have previously attracted less attention from socioeconomic scientists and there is dire need for socioeconomic studies.
    Keywords: Fisheries
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17188 | 4230 | 2016-02-19 09:12:29 | 17188 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-10
    Description: During the reporting period, NaFIRRI realigned its projects under ARTP II extension to focus on:1. Determination of appropriate technologies and methods for harvesting and conservation of fish species in the Albert and Kyoga Systems2. Impact of policies and technologies on livelihoods3. Generation of knowledge for the management of aquatic invasive weeds and their hot spots in Lakes Albert and Kyoga5. Determination of environmental factors influencing productivity for fisheries in Lakes Albert and Kyoga Systems6. MSI - Nile perch project 7. Adaptation and Facilitating Dissemination of Appropriate technologies for harvesting Commercial Species8. Identification of fish species suitable for culture and marketing, and promotion of their commercial culture in the Eastern AEZ.
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 17
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    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17203 | 4230 | 2016-02-23 08:41:44 | 17203 | National Fisheries Resources Research Institute, Uganda
    Publication Date: 2021-07-11
    Description: The review report on Kyoga basin lakes (NAFIRRI 2007) described Kyoga basin lakes as important natural resource for the communities within the basin and the surrounding areas. Fisheries of the basin provide a source of protein, income, and employment to generally poor communities in the area. The lakes also generate revenue to the local Governments within the catchment. This indicates that the fisheries of Kyoga basin lakes are a key instrument in poverty eradication and food security. The lakes also act as a source of water for domestic, agricultural and transport purposes. Some of the Kyoga small lakes harbour fish species, which have disappeared from the main lakes Victoria and Kyoga and are therefore important for biodiversity conservation
    Keywords: Fisheries ; Limnology
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 10
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