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  • 1
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    The history and fishery potential of Kisoro Minor Lakes part two: Preliminary survey of Lakes Mutanda and Mulehe fisheries  (2021)
    Fisheries Resources Research Institute | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17025 | 4230 | 2016-02-19 09:19:59 | 17025 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-10
    Description: The fisheries of Lakes Mutanda and Mulehe during 1998/9 were mainly at subsistence scale and only few fishers operated at irregular intervals. The commercial catch records between 1963 to 1999 showed that Lake Mulehe was landing more fish than Lake Mutanda despite the fact that Lake Mutanda (26.4 km2) was bigger than Lake Mulehe (4.11 cm2). The constant decline of catches was due to irregular restocking and applying low stocking densities of fry. However, restocking should consider using species that withstand low temperature (15-240C) in the district. These include Oreochromis niloticus (Nile tilapia), Macropterus salmoides (Black bass), and Cyprinus carpio (Common carp). Most of these species have either disappeared or declined to very low levels. Due to lack of commercial fish species for harvest, the fishers by 1998/9 resorted to harvesting the haplochromines, Clarias carsoni and edible frogs (Xenopus kigesiensis) as alternative resources. Experimental studies have shown the need and techniques to enhance fish production on these two lakes.
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 20
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  • 2
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    Recent trends in fisheries in Northern portion of Lake Victoria, Uganda (2021)
    Uganda Freshwater Fisheries Research Organization | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/19617 | 4230 | 2020-10-26 04:21:28 | 19617 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-02
    Description: A study on the fish stocks and feeding habits of Lates niloticus in the northern portion of Lake Victoria (Uganda) was conducted during the period 1981 to 1985. A general decline in catch rates and total landings was observed. This was due to, along other factors, overfishing, use of beach seines and smaller lesh gill nets and predation on some of the species by L. niloticus. The most notable changes during the period were a sharp decline of the haplochromines and an increase of Rastrineobola argentea in commercial landings and a change in the feeding habits of L. niloticus from haplochrolines to Caridina and juvenile L. niloticus. There was also a decline in average weight of L. niloticus in both trawl catches and commercial landings.
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 12
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  • 3
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    Plankton identified in stomach contents of Oreochromis niloticus (Pisces, CICHILIDAE) and the water system of Lakes Edward, George and Kazinga channel-Uganda (2021)
    Fisheries Research Institute | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/19893 | 4230 | 2020-10-20 04:25:32 | 19893 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-05
    Description: Lake Edward is connected to Lake George by Kazinga Channel and the commercial fisheries of this water system are dominated by Oreochromis niloticus and Bagrus docmak. However, Oreochromis niloticus is on the decline in commercial catches and yet the water system may be rich in phytoplankton, the common food for Oreochromis niloticus.
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 12
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  • 4
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    Fishing gear selectivity of Lates niloticus L. (Nile perch), Oreochromis niloticus L. (Nile tilapia) and Rastrineobola argentea Pellegrin (Mukene) in lakes Victoria, Kyoga and Nabugabo (2021)
    Fisheries Research Institute | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20288 | 4230 | 2016-03-05 09:38:34 | 20288 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-09
    Description: Catch effort data on which fisheries management regulations are sometimes based are not available for most lakes in Uganda. However, failure to regulate fishing gears and methodshas been a major cause of collapse of fisheries in the country. Fisheries have been damagedby destructive and non-selective fishing gears and methods such as trawling and beach seining, by use of gill nets of mesh size which crop immature fish and by introduction ofmechanised fishing. Selectivity of the gears used to crop Lates niloticus 1. (Nile perch),Oreochromis niloticus 1. (Nile tilapia) and Rastrineobola argentea (Mukene) which are currently the most important commercial species in Uganda were examined in order torecommend the most suitable types, sizes and methods that should be used in exploiting thesefisheries . Gill nets of less than 127 mm mainly cropped immature Nile ti1apia and Nile perch. To protect these fisheries, the minimum mesh size of gill nets should be set at 127 mm.Seine nets of 5 mm do catch high proportions of immature Mukene while those of 10 mmcatch mainly mature Mukene. When operated inshore, both sizes catch immature Nile perchand Nile ti1apia as by-catch. To protect the Mukene fishery and avoid catching immature byecatch,a minimum mesh size of the Mukene net should have been 10 mm operated as Lamparatype net offshore but since most fishennen have been using the 5 mm seine for over five years the minimum size should not be allowed to drop below 5 mm pending further thoroughinvestigations. Beach seining, trawling and are destructive to fisheries and should beprohibited until data that may justify their use is available.
    Description: All chapters begin page 1. On title page: Ugandan version. Chapter 11B.
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 1-10
    Format: 171
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  • 5
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    The fisheries and fish stocks of Lake George: their productivity, exploitation, management and conservation (2021)
    Fisheries Research Institute | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20335 | 4230 | 2016-03-10 08:49:13 | 20335 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-09
    Description: The study was confined to the fisheries of Lake George. The fishery of Lake George has been exploited under controlledexploitation but the permitted number of boats was fixed in the 1950s before the human population increased to the current level. Many more people were involved in fishing and it was feared that the fish stocks might not support the human population. The assignment involved preparation of a research proposal, collection of field data and production of a report in a period of eight months.
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 82
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  • 6
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    The fishery potential of the minor lake (Nabisojjo) - Luwero District (2021)
    In:  http://aquaticcommons.org/id/eprint/20348 | 4230 | 2016-03-15 09:35:06 | 20348 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-09
    Description: Luwero district before the creation of Nakasongola District had a share of south-western portion of Lake Kyoga. After loosing the portion of the lake, they want to resort the minor lake (Nabisojjo) for supply of fish at least to the population around this lake. The plans were to start commercial fishing. The lake is 45 km from Luwero town adjacent 10 the road going to Ngoma town. River Nabisojjo, a tribulary of river Mayanja flows through the lake on its way to river Kafu. The main objective of the scientific field study on Lake Nabisojjo was therefore to generate information on the status of the lake fishery and recommend to the local authorities the next line of action.
    Keywords: Fisheries ; Fisheries Resources Research Institute ; Uganda
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 9-16
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  • 7
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    The fish stocks of Kabaka's Lake (2021)
    Lake Victoria Environmental Management Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20358 | 4230 | 2020-09-04 01:01:17 | 20358 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-09
    Description: Kabaka's Lake as the name implies, is a lake that belongs to the Buganda Kingdom which is under the Kabaka of Buganda (King of Buganda) and is located in the central portion of Kampala city. At the launching of "Food for all in Buganda" campaign during November 1999 at Nfuufu in Mukono District -Uganda, National Agricultural Research Organisation (NARO) was requested to find means of reactivating the fishery potential of the lake. The lake had been stocked with the Nile perch (Lates niloticus & T. zilli) during 1950s and the fishery was not being efficiently exploited. After restocking, no monitoring was done and therefore it was not known whether the introduced species established themselves. Restocking was mainly aimed at enabling this lake provide a source of food and recreation. The major objective of the study therefore was to establish the present status of the fishery by determining the fish species composition, distribution, relative abundance, population structure of the major fish species, catch rates in the gill net fishery and the biology and ecology of the dominant fish species. The study was conducted during 2000
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 1-10
    Format: 10
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  • 8
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    Biological observations in Indian mackerel, Rastrelliger kanagurta (Cuvier) 1816, (Pisces: Scombridae) from East African waters (2021)
    In:  http://aquaticcommons.org/id/eprint/20556 | 4230 | 2016-04-23 17:23:51 | 20556 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-11
    Description: The present study was under taken to provide further and more detailed information on the apparent seasonal and relative abundance of the species, food and feeding habits. Spawning season and size composition. The incidence of parasites, in relation to the month of the year and the fish length, was also examined.
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 61-78
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  • 9
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    Fish exploitation and changes in the fish community of Lake George, Uganda (2021)
    In:  http://aquaticcommons.org/id/eprint/20563 | 4230 | 2016-04-23 17:38:29 | 20563 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-11
    Description: Unlike Lake Victoria, the fisheries of Lake George have undergone gradual changes in the size and proportion of the major commercial fish species, the Nile tilapia (Oreochromis niloticus: cichlidae) in the last 40 years (1950-1989). The size decreased from an average weight of 900g in 1950 to 430g in 1989 while percentage contribution in commercial catches during the same period declined from 92% to 36%. The over all annual commercial catches though showed a steady increase from the period 1950 when the fishery was opened to intensive and controlled exploitation, consistently high catches were observed in the 1960s and 1970s followed by a general decline in the early 1980s to amore or less stable fishery in the late 1980s.These changes are attributed to increased fishing pressure especially on the nil tilapia and to increased use of smaller gill net mesh sizes lower than the recommended 127mm mesh. The changes in gill net mesh have brought O. leucostictus, acichlid, into commercial catches confirming that the 88.9mm mesh size nets are used by the commercial fishermen to harvest smaller fish species.The commercial catches are presently dominated by the piscivorous fishes,(over 60%) whose contribution was less than 10% during initial exploitation of the virgin fishery in 1950.The piscivorous fish are mainly caught using hooks and lines. The entire fishery is believed to be exploited close to the maximum. The above trends serve to show the impact of exploitation on fish species diversity. Quantitive and qualitative changes of the major fish species on lake George are due to exploitation pressure unlike Lake Victoria where it is a combination of both exploitations and impact of fish introductions. There has been no fish introduction in Lake George.
    Keywords: Fisheries ; Uganda Freshwater Fisheries Research Organisation
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 1-7
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  • 10
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    Plankton identified in stomach contents of Oreochromis niloticus (Pisces, Cichlidae) and the water system of Lakes Edward, George, and Kazinga channel - Uganda (2021)
    In:  http://aquaticcommons.org/id/eprint/20614 | 4230 | 2016-05-04 11:57:52 | 20614 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-11
    Description: The samples were collected from Lake Edward at Rwenshama, Kisenyi and Katwe, and from Lake George at Mahyoro, Kashaka and Kasenyi and in Kazinga Channel at Katunguru. The organisms identified from the water samples obtained irrespective of station or depth were mainly the phytoplankton (diatoms, blue-green algae and green algae). Of the phytoplankton, blue green-algae were the mostabundant both in quantity and number of species especially in L. George. In order of importance were Microcystis spp,Planktolyngbya spp and Anabaenopsis spp were the dominant blue greens. Diatoms and green algae were present but less abundant. The estimated proportions of different types ofphytoplankton identified in O. niloticus stomach contents indicate that bluegreen algae were the most abundant followed by the diatoms and green algae.
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 49-54
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