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  • 1
    Electronic Resource
    Electronic Resource
    Changes in the prey ingested and the variations in the Nile perch and other fish stocks of Lake Kyoga and the northern waters of Lake Victoria (Uganda) (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 37 (1990), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The fish stocks of Lakes Kyoga and Victoria have changed since Nile perch, Lates niloticus (L.), was introduced, and this is reflected in the prey ingested by the predator. Initially, haplochromine cichlids constituted the main prey of most sizes of Nile perch. As the stocks of these have declined, Caridina nilotica (Roux) and Anisopteran nymphs have become the dominant food of the juveniles, while Rastrineobola argentea (Pellegrin), juvenile Nile perch and Oreochromis niloticus (L.) have become the main food of larger Nile perch. Apart from R. argentea, most of the native fish species of these lakes have disappeared. The stocks of Nile perch in Lake Kyoga, to which it was introduced earlier than to Lake Victoria, have declined after dominating the fishery since 1965. and have been superseded by O. niloricus. an introduced herbivore. Similar changes are now occurring in Lake Victoria. The Nile perch might not maintain the high yield realized in the two lakes when haplochromines were abundant. It is therefore necessary to exercise caution with high and long-term investments aimed specifically at developing the Nile perch fishery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1990.tb05926.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The reduction in fish species diversity in Lakes Victoria and Kyoga (East Africa) following human exploitation and introduction of non-native fishes (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 37 (1990), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1990.tb05040.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Deterioration in length–weight relationships of Nile perch, Lates niloticus L. in lakes Victoria, Kyoga and Nabugabo (1999)
    Springer
    Hydrobiologia 403 (1999), S. 81-86 
    Details
    ISSN: 1573-5117
    Keywords: condition factor ; haplochromines ; food ; over-exploitation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nile perch Lates niloticus is an exotic predator that has had profound effects on fish communities in lakes where it has been introduced. Length–weight relationships of Nile perch in lakes Victoria, Kyoga and Nabugabo were examined to see how they had changed following the depletion of its haplochromine prey. Length–weight relationships in the new habitats were compared to those in Lake Albert and other native habitats of the Nile perch. The length to weight ratios in the new habitats were initially higher than in Lake Albert and other native habitats. After the haplochromines had been depleted, they declined to values below those of Lake Albert and most native habitats to the lowest value known. They have remained at this level for at least 15 years in Lake Kyoga, where Nile perch was introduced earliest. A similar pattern is developing in lakes Victoria and Nabugabo. Further stress on the prey population could depress the weight to length ratios to levels where it could affect the health of Nile perch stocks and make its fishery unviable. Therefore, human exploitation of Nile perch prey should be avoided. An alternative would be to heavily fish the Nile perch to increase the prey to predator ratio.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003720022870
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    Paper (German National Licenses)
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  • 4
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    The integration of field survey and remote sensing for biodiversity assessment: a case study in the tropical forests and wetlands of Sango Bay, Uganda (1998)
    Elsevier
    Details
    Publication Date: 1998-12-01
    Print ISSN: 0006-3207
    Electronic ISSN: 1873-2917
    Topics: Biology
    Published by Elsevier
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    PAPER CURRENT
  • 5
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    Lake Victoria Fisheries Management Plan (2021)
    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
    Details
    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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  • 6
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    The relationship between boat size and fish catches in the gillnet fishery of Lake Victoria, Uganda (2021)
    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
    Details
    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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  • 7
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    Suggestions to set mesh size limits and restrict the fishing methods and the types of fishing gears on Lakes Victoria and Kyoga (2006)
    ICIPE SCIENCE
    Details
    Publication Date: 2021-05-19
    Description: On the basis of observations, it is recommended that 127 mm should be the minimum mesh size of gillnet permitted on Lakes Victoria and Kyoga. The minimum length of Nile tilapia (Oreochromis niloticus) should remain at 28 cm but that of Nile perch (Lates niloticus) should be increased from 46 cm to 50 cm. The minimum mesh size limit of seine net for Mukene on Lake Victoria should be 10 mm and fishing for Mukene should be done using lampara net operated offshore.
    Description: Kenya Marine and Fisheries Research Institute and the European Economic Community
    Description: Published
    Description: Stings
    Keywords: Lates niloticus ; Oreochromis niloticus ; Rastrineobola argentea ; Catchability ; Fishery regulations ; Mesh selectivity
    Repository Name: AquaDocs
    Type: Proceedings Paper , Non-Refereed
    Format: 358354 bytes
    Format: application/pdf
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  • 8
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    The Impact of Fishing Gears and Methods on the Fisheries of Lake Victoria, Kyoga and Nabugabo with Specific Recommendations on Management of the Fisheries (2021)
    Uganda Freshwater Fisheries Research Organization | Jinja ,Uganda
    In:  http://aquaticcommons.org/id/eprint/19620 | 4230 | 2020-10-17 15:02:12 | 19620 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-02
    Description: The impact of gill nets, beach seines and mosquito seines which are the dominant fishing gears on Lakes Victoria, Kyoga and Natugabo and trawling which is practiced in some regions of lake Victoria were analysed in relation to biological parameters of Nile perch, Nile tilapia and Rastrineobola argentea (Mukene).The analysia showed that the Fish and Crocodiles (Immature Fish) Instrument of 1981 of Uganda was inadequate in protecting the fish stocks. It was recommended that 127 mm (5 inches) should be the minimum mesh size of gillnet permitted on lakes Victoria, Kyoga and Nabugabo and of trawl codend on Lake Victoria. The minimum length of Nile tilapia permitted should remain at 28 mm but that of Nile perch should be increased from 46 mm to 50 mm. The minimum mesh size limit of seine net for Mukene on Lake Victoria should be 10 mm and Mukene should be fished using Lampara net operated offshore.
    Description: Published after 1990 based on cited references.
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
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  • 9
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    The decline of the native fisheries of Lakes Kyoga and Victoria and the impact of Nile perch, Lates niloticus on these fisheries (2021)
    Uganda Freshwater Fisheries Research Organization | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/19618 | 4230 | 2020-11-11 19:30:12 | 19618 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-02
    Description: There has been a decline almost to the total disappearance and in some cases apparently the extinction of most of the native fish species of Lakes Victoria and Kyoga since the development of the fisheries of these lakes begun at the beginning of this century. The Nile perch, Lates niloticus, a large voracious predator which was introduced into these lakes about the middle of the century along with several tilapiine species is thought to have depleted stocks of other fish. But other factors, such as overfishing, changes in the habitat which can result in fish kills or affect breeding and recruitment, plus competition with other species, appear to have contributed to the diminution in the stocks of other fish.The available information indicates that by the time the Nile perch was established, the stocks of the native tilapiine species had been reduced by over fishing. The Labeo victorianus fishery had similarly been destroyed by intensive gill netting of gravid individuals on breeding migrations. L. niloticus is however, capable of depleting the stocks of species which have disappeared and could have consumed the remnants - thus preventing their recovery. It is also directly responsible for the decline in the populations of the haplochromine cichlids which were abundant over most of these lakes when it was established. The native tilapiine species were also affected by the introduced species which have similar ecologicalrequirements.
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 10
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  • 10
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    Fisheries research in Uganda (2021)
    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
    Details
    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
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 3-14
    Format: 321
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