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  • Fisheries  (168)
  • Cell & Developmental Biology
  • Inorganic Chemistry
  • Lake Victoria Fisheries Research Project
  • 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
    Format: application/pdf
    Format: application/pdf
    Format: 38
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  • 2
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4926 | 424 | 2011-09-29 15:42:28 | 4926 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: Multimesh, multidepth gillnet fleets are useful in assessing fish stock abundance, size distribution and depth distribution. Using data collected on net mesh selectivity for Nile perch, Lates niloticus (L.), in the Kenyan waters of Lake Victoria, suitable mesh sizes for gillnet fleets for use in the Lake Victoria Fisheries Research Project were determined. The modal selection length for Nile perch in the mesh sized used in the earlier experiment were determined, as was the size range vulnerable to capture.Initial trials suggest 60% of the Nile perch swim within 5 m of the bottom. Setting and hauling of the nets is simple and quick, allowing the nets to be used at the same time as other sampling programmes.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/06; This is Part 2 of LVFRP Technical Document No 6; Part 1 of LVFRP Technical Document No 6's title is: Report on third FIDAWOG workshop held at the Triangle Hotel, Jinja, 29 March to 1 april 1999.
    Keywords: Fisheries ; Management ; Africa ; Kenya ; Lake Victoria ; stock assessment ; gillnet fleets ; Lates niloticus
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
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    Format: 1-12
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  • 3
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4928 | 424 | 2011-09-29 15:42:30 | 4928 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: Co-management is typically known to be a resource management system that shares managerial responsibility between the state and other stakeholders of a resource. In the case of Lake Victoria, one would expect the state to be represented by the fisheries departments of Kenya, Uganda and Tanzania, while stakeholder groups may comprise fishing communities, fish processing factories and municipalities.Taking that into account, the survey's objectives were defined as:(a) To identify the difficulties and impracticalities inherent in implementing state-based regulations via a "top-down" management strategy.(b) To assess the prevalence of community-based institutions that either seek to regulate the fishery or have the potential to be used to regulate it.(c) To identify ways in which community-based regulatory and monitory systems may be established, and how these will fare over time.(d) To identify roles for national Fisheries Departments, industrial fish processors and other stakeholders.(e) To develop well-founded policy suggestions for the establishment of a co-management framework to manage the fisheries of Lake Victoria.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/11
    Keywords: Fisheries ; Management ; Policies ; Africa ; Lake Victoria ; co-management ; fisheries stakeholders ; community-based institutions
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
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  • 4
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4929 | 424 | 2011-09-29 15:43:05 | 4929 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: In this brief introduction, we set out to provide an overview of the Lake Victoria Fisheries Research Project (LVFRP) and, more specifically, its socio-economic program, and to define the place of the Co-management Survey within the activities of the LVFRP as a whole.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/11
    Keywords: Fisheries ; Management ; Policies ; Africa ; Lake Victoria ; co-management ; fisheries stakeholders ; community-based institutions
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 11-12
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  • 5
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4925 | 424 | 2011-09-29 15:42:26 | 4925 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: Three Lake Victoria rivers were sampled to assess fish abundance and distribution in preparation for assessment of catches from the river systems. Preliminary fish abundance data indicate that fishing potential upstream is negligible but that important commercial species are present in the downstream floodplain areas. Three catfish species were recorded in the Nzoia river system that have not been found previously in the Kenyan sector of the Lake Victoria system, together with possibly two undescribed Barbus species.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/06; The document includes 6 tables.
    Keywords: Fisheries ; Limnology ; Management ; Africa ; Kenya ; Lake Victoria ; river Nzoia ; river Nyando ; river Sondu Miriu ; stock assessment ; inland fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 106-125
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  • 6
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4933 | 424 | 2011-09-29 15:42:16 | 4933 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: This short book section analyses the role of Fisheries Department personnel in the process of co-management related to the LVFRP.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/11
    Keywords: Fisheries ; Management ; Policies ; Africa ; Lake Victoria ; co-management ; fisheries stakeholders ; community-based institutions
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 63-64
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  • 7
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4930 | 424 | 2011-09-29 15:42:24 | 4930 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: In this book section, the theoretical background to the methodology is outlined, questionnaire development described, sample selection outlined and biases and shortcomings to the survey noted.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/11
    Keywords: Fisheries ; Management ; Policies ; Africa ; Lake Victoria ; co-management ; fisheries stakeholders ; community-based institutions
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 13-48
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  • 8
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4932 | 424 | 2011-09-29 15:42:18 | 4932 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: As it is clearly stated in the title, this book section aims to identify fishers' livelihoods and their role as a stakeholder in the process of co-management with the other stakeholders and official institutions within the LVFRP.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/11
    Keywords: Fisheries ; Management ; Policies ; Africa ; Lake Victoria ; co-management ; fisheries stakeholders ; community-based institutions
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 49-62
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  • 9
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4935 | 424 | 2011-09-29 15:41:19 | 4935 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: This book section aims to synthesise the results of the surveys related to the LVFRP by developing different strategies to implement a sustainable and participative co-management model.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/11
    Keywords: Fisheries ; Management ; Policies ; Africa ; Lake Victoria ; co-management ; fisheries stakeholders ; community-based institutions
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 74-94
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  • 10
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4934 | 424 | 2011-09-29 15:42:03 | 4934 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: This book section analyses the role of fish processing factories in the process of co-management related to the LVFRP.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/11
    Keywords: Fisheries ; Management ; Policies ; Africa ; Lake Victoria ; co-management ; fisheries stakeholders ; community-based institutions
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 65-73
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  • 11
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4942 | 424 | 2011-09-29 15:41:17 | 4942 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: This paper analyses the location, potentialities and set-backs of Nkombe Beach, the landing site chosen in Uganda for the 4-beaches survey.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/17
    Keywords: Fisheries ; Management ; Africa ; Uganda ; Nkombe Beach ; Lake Victoria ; co-management ; fisheries stakeholders
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 49-53
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  • 12
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4937 | 424 | 2011-09-29 15:41:59 | 4937 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: 1) The 4-beaches survey was the first of its kind on Lake Victoria. Drawing on Participatory Rural Appraisal (PRA) techniques, four landing sites around the lake were selected for long-term monitoring from March 2000 through to October 2001.2)Held in all the 3 riparian countries of Lake Victoria the stakeholders' workshops aimed to assess the necessity of fisheries management for Lake Victoria and to identify who the stakeholders in fisheries management would be.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/17
    Keywords: Fisheries ; Management ; Africa ; Lake Victoria ; co-management ; fisheries stakeholders
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 1-18
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  • 13
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    Lake Victoria Fisheries Research Project | Jinjia, Uganda
    In:  http://aquaticcommons.org/id/eprint/4939 | 424 | 2011-09-29 15:41:11 | 4939 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: In Kenya, fisheries resource management has been based on the top-down centralized approach since the colonial days. Stakeholders have never been consulted concerning management decisions. The 4-beaches Study was undertaken to investigate the potential for an alternative management system for Lake Victoria.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/17
    Keywords: Fisheries ; Management ; Africa ; Kenya ; Obenge ; Lake Victoria ; co-management ; fisheries stakeholders
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 39-48
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  • 14
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4943 | 424 | 2011-09-29 15:41:09 | 4943 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: Two landing sites were chosen in Tanzania for the 4-beaches survey. The former, Ihale, is a large one with an avarage of 120 boats and direct connections to the fish processing factories. The latter, Mwasonge, is one of the smallest landing sites in the Mwanza region with totally different characteristics. This book section aims to analyse the results from these two sites in the context of the co-management potentialities in Tanzania and more generally on the Lake Victoria region.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/17
    Keywords: Fisheries ; Management ; Africa ; Tanzania ; Ihale ; Mwasonge ; Lake Victoria ; co-management ; fisheries stakeholders
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 54-62
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  • 15
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4936 | 424 | 2011-09-29 15:41:22 | 4936 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: The purpose of this Fisheries Management Plan (FMP) within the Lake Victoria Fisheries Research Project was to sustain the livelihoods of the communities who depend on the fishery resources of the lake and to reduce poverty, food insecurity and unemployment. To achieve this goals, a better management of the resources, which would mobilize and include stakeholders at local, regional, national and international level was believed to be the right strategy for success. (PDF contains 79 pages)
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/01/16; Introductory pages i to viii include table of contents, acronyms and an executive summary
    Keywords: Fisheries ; Management ; Planning ; Africa ; Lake Victoria ; co-management ; fisheries stakeholders ; community-based institutions ; livelihoods
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 1-64
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  • 16
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4949 | 424 | 2011-09-29 15:40:29 | 4949 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: The FIDAWOG workshop held at the Tom Mboya Labour College in Kisumu was the fourth stock assessment workshop held under the LVFRP programme. There were two main objectives: training in paper and report writing and presentation, and presentation of research results collected to date.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Uganda ; Kisumu ; stock assessment ; data collection ; data report
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 1-8
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  • 17
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4952 | 424 | 2011-09-29 15:40:21 | 4952 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: Trawl surveys to assess the stocks of Lake Victoria for estimates of biomass and yield, together with the establishment of exploitation patterns, are being undertaken under the Lake victoria Fisheries Research Project. Preliminary surveys to establish the sampling stations and strategy were carried out between October 1997 and February 1998. Three cruises to cover the whole of the Tanzanian waters were undertaken with a total of 133 sampling stations. Data on catch rates, species composition and distribution were collected.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Tanzania ; stock assessment ; data collection ; data report
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 26-45
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  • 18
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4946 | 424 | 2011-09-29 15:40:36 | 4946 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: This book section aims to give an overview of the Stakeholders' Workshop taken at Mwanza (Tanzania) to evaluate the role and potentials of local stakeholders, in relation to the co-management of Lake Victoria's fisheries within the frame of the LVFRP.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/17
    Keywords: Fisheries ; Management ; Africa ; Tanzania ; Mwanza ; Lake Victoria ; co-management ; fisheries stakeholders
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 105-119
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  • 19
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4954 | 424 | 2011-09-29 15:39:55 | 4954 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: The number and size composition of gillnets, fishing grounds, and the quantity and composition of fish catches were related to the size of fishing boat. The overall number of gillnets per boat increased from 20.9 + or - 2.3 nets in 5-6 m long boats to 88.6 + or - 11.8 nets in 11-12 m long boats. The proportion of large mesh sizes, + or more than 127 mm, also increased from 40% in 5-6 m long boats to 100% in boats longer than 10 m. Fish catches are related to the size of boat and this should be considered when formulating management guidelines of the lake's fishery. Promotion of large fishing boats 8 m or longer and restriction on the number and/or mesh size of gillnets of smaller boats could increase ecological and socio-economic benefits.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Uganda ; stock assessment ; data collection ; data report ; Lates niloticus ; Oreochromis niloticus
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 63-77
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4951 | 424 | 2011-09-29 15:40:31 | 4951 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: A total of 457 hauls were taken during experimental bottom trawl surveys in the Uganda sector of Lake Victoria between November 1997 and June 1999 to estimate composition, distribution and abundance of the major fish species in waters 4-60 m deep. Fifteen fish groups were caught with Nile perch, Lates niloticus (L.), constituting 94% by weight. Haplochromines and L. niloticus occurred in all areas sampled, while Nile tilapia, Oreochromis niloticus (L.) and other tilapiines were restricted to waters 30 m deep or less. The mean trawl catch rate in the zone where artisanal fishermen operate (i.e. in waters less deep than 30 m was 165 kg hr, of which 93.6% comprised L. niloticus. Species diversity and relative abundance decreased with increasing water depth.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Uganda ; Kisumu ; stock assessment ; data collection ; data report
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 10-25
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4944 | 424 | 2011-09-29 15:41:06 | 4944 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: This book section is a review of a workshop, the one held at Jinja in Uganda, which aimed to assess the potential local stakeholders within the frame of the co-management of Lake Victoria's fisheries.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/17
    Keywords: Fisheries ; Management ; Africa ; Uganda ; Jinja ; Lake Victoria ; co-management ; fisheries stakeholders
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 63-79
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4938 | 424 | 2011-09-29 15:42:01 | 4938 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: As it is clearly indicated in the title of this book section, it overviews the methodologies used in the 4-beaches Survey and in the various Stakeholders' Workshops held in all the three riparian countries of the Lake Victoria.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/17
    Keywords: Fisheries ; Management ; Africa ; Lake Victoria ; co-management ; fisheries stakeholders
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 19-38
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4947 | 424 | 2011-09-29 15:40:56 | 4947 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: This short paper aims to give an overview of all the conclusions and recommendations related to the 4-beaches Survey and the Stakeholders' Workshops held in all the three Lake Victoria riparian countries within the frame of the LVFRP.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/17
    Keywords: Fisheries ; Management ; Africa ; Kenya ; Obenge ; Bondo ; Uganda ; Nkombe Beach ; Jinja ; Tanzania ; Ihale ; Mwasonge ; Mwanza ; Lake Victoria ; co-management ; fisheries stakeholders
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 120-122
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4955 | 424 | 2013-10-27 12:07:03 | 4955 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: Catch and effort assessment surveys have been used to assess trends in fish landings in Kenyan waters of Lake Victoria since 1976. Landings reached a maximum of 200000 t annually in 1989-1991 as Nile perch, Lates niloticus (L.), catches increased due to an expansion in stock size and increased fishing effort. CPUE peaked at 180 kg boat day-1 in 1989 and decreased thereafter with increasing effort. By 1998 total Nile perch catches were half those at the beginning of the decade despite increased effort. Catches of Rastrineobola argentea (Pellegrin) have levelled off despite increased effort.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Kenya ; stock assessment ; data collection ; data report ; artisanal fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 78-91
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4953 | 424 | 2011-09-29 15:40:25 | 4953 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: Bottom trawl surveys were conducted in Kenyan waters of Lake Victoria during the period September 1997 and March 1999. The means of fish biomass for the two most important species: Lates niloticus (L.) and Oreochromis niloticus (L.) were estimated at 61.5 kg ha and 4.5 kg ha respectively. There were few L. niloticus greater than 80 cm TL and O. niloticus greater than 50 cm TL, though these species attain maximum sizes of 205 cm and 65 cm respectively. Oreochromis niloticus was mostly found shallower than 5 m though some specimens were encountered deeper than 10 m, suggesting that the species has extended its ecological range. Very low catches were obtained from areas under water hyacinth cover. Water in such areas was turbid with oxygen levels below the critical 3.0 mg L.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Kenya ; stock assessment ; data collection ; data report ; Lates niloticus ; Oreochromis niloticus
    Repository Name: AquaDocs
    Type: book_section
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4945 | 424 | 2011-09-29 15:40:33 | 4945 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: This paper is a review of the workshop held at Bondo in Kenya to assess the role of local stakeholders in the of co-management of Lake Victoria's fisheries within the frame of the LVFRP.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/17
    Keywords: Fisheries ; Management ; Africa ; Kenya ; Bondo ; Lake Victoria ; co-management ; fisheries stakeholders
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    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 80-104
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4957 | 424 | 2011-09-29 15:39:21 | 4957 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: Catch trends from Fisheries Department reports from the last eleven years (1985-1995) were analyzed. These showed a shift in the fishery from a cichlid-based system to one dominated by Nile perch and tilapias. In recent years, catches have declined from a peak in the early 1990s. Catch per unit effort appears to have remained stable except for a drop in 1995, however, this is considered dubious because the effort showed a doubling in that year. Limitations of the fisheries data collection system for the Tanzanian sector of Lake Victoria are highlighted and discussed.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Tanzania ; stock assessment ; data collection ; data report
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 99-107
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4956 | 424 | 2011-09-29 15:39:53 | 4956 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: Four fleets of hanging coefficients 0.2, 0.4, 0.6 and 0.8 were used to determine size selectivity and selection factors of Nile perch populations. There was a linear relationship between mesh size and modal length of capture. Positively skewed length frequency distributions were found for smaller mesh sizes with entanglement becoming more prominent in mesh sizes above 101 mm. Nets of 114 to 141 mm stretched mesh yielded higher economic returns than small meshes, the catch consisting of few largefish.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Kenya ; stock assessment ; data collection ; data report ; Lates niloticus
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 92-98
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/5001 | 424 | 2011-09-29 15:35:04 | 5001 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: Caridina nilotica (Roux) (Decapoda: Atyidae) was investigated over a period of four months in three zones of Lake Victoria. Abundances were estimated by vertical net sampling. The importance of C. nilotica in the diet of the three commercial fish species was investigated. Caridina nilotica is a primary food for Lates niloticus (L.), Oreochromis niloticus (L.) and Rastrineobola argentea (Pellegrin). A quantitative study of C. nilotica in the fishing area indicated high biomass which can support the Lake Victoria fisheries.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Lake Victoria ; Caridina nilotica ; data collection ; data report ; artisanal fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 155-162
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/5009 | 424 | 2011-03-30 08:13:34 | 5009 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: Recent surveys have indicated an increase in haplochromine biomass recorded from the bottom trawl and in the beam trawl. The haplochromines recovering in the offshore waters belong to three species in the zooplanktivorous trophic group: Yssichromis laparogramma (Greenwood and Gee), Yssichromis fusiformis (Greenwood and Gee) and Astatotilapia lacrimosa (Boulenger). In this paper, the species composition and relative abundance of the zooplanktivorous haplochromines recorded from the bottom and frame trawl surveys in the various parts of the Ugandan waters of Lake Victoria are discussed.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Lake Victoria ; Uganda ; zooplanktivorous haplochromines ; data collection
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 199-203
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/5008 | 424 | 2011-09-29 15:34:05 | 5008 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: The reproduction of Nile tilapia, Oreochromis niloticus (L.), in the Nyanza Gulf of Lake Victoria was studied from June 1998 to May 1999. Length at maturity ranged from 28-30 cm TL for females and from 32-34 cm TL for males. Males were more abundant in all length classes longer than 36 cm TL. Relative condition factor was above unity, except in August, October and May for males, and October for females. Gonadosomatic index (GSI) was low during the post spawning period (July to October) and high during the protracted breeding period (December-June).
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Lake Victoria ; Oreochromis niloticus ; Nyanza Gulf ; data collection
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 192-198
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/5006 | 424 | 2011-09-29 15:34:19 | 5006 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: Oreochrimis niloticus (L.) was introduced to Lake victoria in the 1950s. It remained relatively uncommon in catches until 1965, when the numbers began to increase dramatically. It is now the third most important commercial fish species after the Nile perch, Lates niloticus (L.) and Rastrineobola argentea (Pellegrin). Oreochromis niloticus is considered a herbivore, feeding mostly on algae and plant material. The diet now appears to be more diversified , with insects, fish, algae and plant materials all being important food items. Fish smaller than 5 cm TL have a diverse diet but there is a decline in the importance of zooplankton, the preferred food item of small fish, as fish get larger. The shift in diet could be due to changes which have occurred in the lake. Water hyacinth, Eichhornia crassipes (Mart.) Solms, which harbours numerous insects in its root balls, now has extensively coverage over the lake. The native fish species which preyed on these insects (e.g. haplochromines) have largely been eliminated and O. niloticus could be filling niches previously occupied by these cichlids and non cichlid fishes. The change in diet could also be related to food availability and abundance where the fish is feeding on the most readily available food items.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Kenya ; Lake Victoria ; Nile tilapia ; water hyacinth ; data collection
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 175-183
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/5000 | 424 | 2011-09-29 15:35:02 | 5000 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: The zooplankton and macrobenthic communities of Lake Victoria were sampled by lift net and Ponar grab, respectively. The zooplankton comprised copepods and cladocerans, rotifers and aquatic insect larvae. Most taxa exhibited wide distribution in the lake, with the exception of rotifers which were rare in deep offshore waters. The main components in the macro-benthos were chaoborid and chironomid larvae and molluscs. Caridina nilotica (Roux) and other groups were rare in the samples. Zooplankton density ranged from 100000 or more to 4 million ind. m2 and increased from the shallow inshore to deep offshore waters. Numerical dominance of cyclopoids and nauplius larvae was a common feature at all stations sampled. Most macrobenthic taxa were also widely distributed, although chaoborid and chironomid larvae were rare in the samples. Rastrineobola argentea (Pellegrin) and larval Lates niloticus (L.) ate mainly cyclopoid copepods, while cichlids showed a strong preference for adult insects. High ecological stability of the cyclopoids, and the zooplankton community in general, despite radical ecosystem changes in recent years, coupled with what appears to be high predation pressure, offers good prospects for the pelagic fishery in the lake.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07; Page 146 was missing from the copy available to us for scanning
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Lake Victoria ; stock assessment ; data collection ; data report ; zooplankton ; artisanal fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 142-154
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/5007 | 424 | 2011-09-29 15:34:22 | 5007 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: Size at first maturity, breeding periods and condition factor were determined for the small pelagic cyprinid Rastrineobola argentea (Pellegrin) in the Jinja waters of Lake Victoria in 1996-1997. Females showed a reduced size at maturity compared to ten years earlier when exploitation of the species was minimal. The males, however, have changed little. Although the species breeds throughout the year, two breeding peaks were observed during the drier months of August and December-January. Minimal breeding was observed in the rainy months of April-May and October-November. Fish from the open water station at Bugaia showed a higher proportion of breeding individuals than those from inshore areas. The mean monthly condition factor of fish from Napoleon Gulf confirmed breeding peaks obtained from examination of gonad development.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Lake Victoria ; Rastrineobola argentea ; Bugaia ; data collection
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 184-191
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/5010 | 424 | 2011-03-25 06:43:37 | 5010 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: In a tagging experiment carried out in the Kenyan waters of Lake Victoria, an annual growth increment of 29 cm yr was obtained for Lates niloticus (L.). Growth parameters obtained using the von Bertalanffy model on the growth curve fitted by eye were L (inf.) = 122 cm yr and k = 0.26 yr. Data for other species tagged were inadequate to obtain meaningful results.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Lake Victoria ; Lates niloticus ; Bagrus docmak ; Oreochromis niloticus ; Clarius gariepinus ; data collection
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 204-207
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/5011 | 424 | 2013-10-27 12:07:37 | 5011 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: The Lake Victoria fish fauna was dominated by cichlids before the establishment of the exotic species Oreochromis niloticus (L.) and Latus niloticus (L.). With the alterations in the ecology of Lake Victoria, changes may be expected to occur in the population dynamics of the fish species. In two zones of Lake Victoria, the size structure, distribution and abundance, condition factors, length-weight relationship and sex ratios of O. niloticus were determined. Larger fish were found in zone II than in zone III, where very few larger fish were recorded. More O. niloticus were caught in zone III, especially in Itome Bay, than in zone II but catch by weight was greater in zone II. More males than females were encountered in both zones. Oreochromis niloticus had similar condition factors in both zones.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Uganda ; Lake Victoria ; Oreochromis niloticus ; data collection
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 208-211
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/5002 | 424 | 2011-09-29 15:35:06 | 5002 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: The zooplankton community of the littoral zone of Nyanza Gulf, Lake Victoria, was studied between June 1998 and June 1999 to identify and quantify various zooplankton groups, and investigate the interactions that occur between them and the littoral fish through the food chain. Zooplankton samples were collected from five stations using a 83 micro-m mesh size plankton net hauled vertically through the water column. Fish samples were obtained by beach seine, except at Gingra (May 1999), where trawl samples were used. Gut/stomach analysis was carried out on the three major commercial species, Lates niloticus (L.), Oreochromis niloticus (L.) and Rastrineobola argentea (Pellegrin).
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Biology ; Fisheries ; Information Management ; Africa ; Lake Victoria ; Kenya ; Nyanza Gulf ; zooplankton ; data collection ; data report ; artisanal fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 163-174
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/5018 | 424 | 2011-09-29 15:33:09 | 5018 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: This document contains the findings of the second Participatory Rural Appraisal (PRA) carried out under the LVFRP. Its principal objectives were to develop base-line information on a Ugandan beach for the 3-beaches survey of the LVFRP.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/09
    Keywords: Fisheries ; Management ; Sociology ; Africa ; Uganda ; Lwalalo Beach ; Lake Victoria ; Co-management ; artisanal fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 36-70
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/5016 | 424 | 2011-09-29 15:33:16 | 5016 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: As stated in the title, this is an introduction to all the reports contained in this technical document and related to the various workshops on Participatory Rural Appraisal (PRA) held in all the riparian countries around Lake Victoria within the LVFRP.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/09; The title of this document reads erroneously "Introduction to LVFRP Technical Document 10". It is in fact in document 9 and obviously relates to all the reports contained in it.
    Keywords: Fisheries ; Management ; Sociology ; Africa ; Lake Victoria ; Co-management ; artisanal fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 1-4
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/5020 | 424 | 2011-09-29 15:32:34 | 5020 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-08
    Description: This document contains the findings of the fourth Participatory Rural Appraisal (PRA) carried out under the LVFRP. Its principal objectives were to develop base-line information on a Ugandan beach for the 3-beaches survey of the LVFRP.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/09
    Keywords: Fisheries ; Management ; Sociology ; Africa ; Uganda ; Nkombe Beach ; Lake Victoria ; Co-management ; artisanal fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 120-146
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/5017 | 424 | 2011-09-29 15:33:13 | 5017 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-07
    Description: Ihale is a large landing site lying approximately 65 km. from Mwanza along the main Mwanza-Musoma highway. Ihale Beach was selected as a potential candidate for the 3-beaches study because of its proximity to Mwanza, and hence suitability for frequent monitoring; and because it is served by a road accessible during the rainy seasons. As with the first training Participatory Rural Appraisal (PRA) on Kiumba Beach on Kenya's Rusinga Island, the objectives with this PRA were as follows: (a) To identify and understand Ihale's community-based organizations and institutions which have a role in the lake's fishery. (b) To consider the key issues which arise from this study for the involvement of communities and community-based organizations and/or institutions such as those at Ihale Beach, in the co-management of Lake Victoria's fishery.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/09
    Keywords: Fisheries ; Management ; Sociology ; Africa ; Tanzania ; Ihale Beach ; Lake Victoria ; Co-management ; artisanal fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 5-35
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/5021 | 424 | 2011-09-29 15:32:37 | 5021 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-08
    Description: This paper comprises part of the so-called "3-beaches Survey" of the LVFRP. In Tanzania, this study has developed to examine two landing sites (Mwasonge and Ihale), and to chart the progress of the newly established Beach Management Units (BMU) at each beach, comparing one BMU against the other. The over-arching objective of this survey was to develop an understanding of the context in which Mwasonge's fishery exists. The study does so by examining the community's history, culture and beliefs, various other socio-cultural factors, their resources, society and economy, wealth and the community's perceptions of wealth. Importantly, the survey examines the community's institutions and its perceptions of fishing rules and changes within the fishery. All of these facets of community life are examined with the use of participatory Rural Appraisal tools, and the images that the study generated are reproduced herein.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/09; This article includes a 3-pages appendix which is a glossary of English towards local languages of the Lake Victoria area related to fish and fisheries.
    Keywords: Fisheries ; Management ; Sociology ; Africa ; Tanzania ; Mwasonge Beach ; Lake Victoria ; Co-management ; artisanal fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 147-185
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/5019 | 424 | 2011-09-29 15:32:04 | 5019 | Lake Victoria Fisheries Organization
    Publication Date: 2021-07-08
    Description: This document contains the findings of the third Participatory Rural Appraisal (PRA) carried out on Obenge Beach in Kenya, from the 23rd to the 26th of June 2000, under the LVFRP. Its principal objectives were to develop base-line information on a Kenyan beach for the 3-beaches survey of the LVFRP.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/00/09
    Keywords: Fisheries ; Management ; Sociology ; Africa ; Kenya ; Obenge Beach ; Lake Victoria ; Co-management ; artisanal fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 71-119
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4150 | 424 | 2011-09-29 16:25:28 | 4150 | Lake Victoria Fisheries Organization
    Publication Date: 2021-06-30
    Description: This document can be considered as the first step in the direction of a complete fish species catalogue for fisheries purposes of the Lake Victoria. (PDF contains 55 pages)
    Description: Republic of Kenya
    Description: Republic of Uganda
    Description: United Republic of Tanzania
    Description: European Development Fund (7 ACP-RPR-372)
    Description: Lake Victoria Fisheries Research Project Phase II
    Keywords: Biology ; Fisheries ; Africa ; Lake Victoria ; commercial species ; freshwater fish ; lake fisheries
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 1-39
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    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/4151 | 424 | 2011-09-29 16:25:30 | 4151 | Lake Victoria Fisheries Organization
    Publication Date: 2021-06-30
    Description: The notes for guidance on preparation of research, research dissertations and scientific papers are meant to assist researchers on how to achieve a successful presentation, writing a technical report or research paper. This comprises some simple rules that have helped many inexperienced writers to get started, and have also helped more experienced writers to get out of a hopeless tangle of observations and inferences. (PDF contains 65 pages)
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/01/13; The document includes 5 appendixes on editing and proof-reading.
    Keywords: Fisheries ; Information Management ; Africa ; Lake Victoria ; abstracts ; aquatic sciences ; bibliographic information ; documents ; manuals ; research ; research programmes ; training aids
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 1-45
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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
    Format: application/pdf
    Format: application/pdf
    Format: 54
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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
    Format: application/pdf
    Format: application/pdf
    Format: 11
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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
    Repository Name: AquaDocs
    Type: monograph
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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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    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
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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
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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
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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
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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
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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
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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
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    Format: application/pdf
    Format: 153-171
    Format: 321
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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/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
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    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
    Format: application/pdf
    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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