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  • 1
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    Reproductive biology of Rastrineobola argentea (Pellegrin) in the northern waters of Lake Victoria (2021)
    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
    Details
    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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  • 2
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    Technical report on the environmental monitoring of the cage area at the Source of the Nile (SON) Fish Farm for quarter 2: April-June 2011 (2021)
    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/17181 | 4230 | 2016-02-19 11:02:51 | 17181 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-10
    Description: Source of the Nile Fish farm (SON) is located at Bugungu area in Napoleon Gulf, northern Lake Victoria. The proprietors of the farm requested for technical assistance of NaFIRRI to undertake regular environment monitoring of the cage site as is mandatory under the NEMA conditions. Thus, NAFIRRI undertakes quarterly environment surveys in the cage area covering selected physical-chemical factors i.e. water column depth, water transparency, water column temperature, dissolved oxygen, pH and conductivity; nutrient status, algal and invertebrate communities (zooplankton and macro-benthos) as well as fish community. The first environmental survey was undertaken in February 2011. Results/observations made during the second quarter (April-June 2011) field survey are presented in this technical report along with a scientific interpretation and discussion of the results with reference to possible impacts of the cage facilities on the water environment and the different aquatic biota in and around the cages including natural fish communities.
    Keywords: Aquaculture ; Environment
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 38
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  • 3
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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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  • 4
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    Growth and mortality of dagaa (Rastrineobola argentea, Fam. Cyprinidae) in Lake Victoria (2021)
    In:  http://aquaticcommons.org/id/eprint/9572 | 115 | 2012-10-03 11:40:06 | 9572 | WorldFish Center
    Details
    Publication Date: 2021-07-07
    Description: Growth and mortality parameters of the small Lake Victoria cyprinid Rastrineobola argentea were determined from length-frequency analysis, using the ELEFAN I and II programs. The results of two sampling programs, both performed during 1988, one in Uganda (mosquito seine) and the other in Tanzania (pelagic trawl), were highly corresponding, In comparison with previously published data on the growth of dagaa and some similar species, low values for L sub( infinity ) (65 mm standard length) and K (1 year super(-1)) were found. Total mortality (Z) amounted to 3.9-4.4 year super(-1). A single annual breeding peak was observed both in Uganda (October/November) and in Tanzania (February/March).
    Keywords: Aquaculture ; Fisheries ; Growth ; Mortality ; Recruitment ; Length ; Frequency analysis ; Size distribution ; Victoria Lake ; Africa ; Rastrineobola argentea
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 42-45
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  • 5
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    Evolution and management of the mukene (Rastrineobola argentea) fishery (2021)
    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
    Details
    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
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
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  • 6
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    Classification and identification of fishes (2021)
    Fisheries Resources Research Institute (FIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/19329 | 4230 | 2020-08-31 00:16:37 | 19329 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-06-25
    Description: Aquatic systems cover 18% of Uganda's surface area in form of lakes rivers and swamps. The lakes can be grouped into Major and Minor lakes. Lakes Victoria, Kyoga, Albert, Edward and George form the Major lakes. A host of small lakes many of them associated with (satellite to) the major lakes form the minor lakes. These minor lakes can further be grouped into Nabugabo lakes, Koki lakes and Lake Wamala as being associated with the Lake Victoria drainage, Kyoga minor lakes (Lakes Opeta, Bisina, Agu, Lemwa, Kawi, Nakuwa, Nawampasa etc.), the numerous western crater lakes and Lake Bunyonyi
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
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  • 7
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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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  • 8
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    Evolution and management of the mukene (Rastrineobola argentea) fishery (2021)
    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
    Details
    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
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 93-105
    Format: 321
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  • 9
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    The role of Yssichromis species (Pisces: Cichlidae) in the trophic ecology and foodwebs of Lake Victoria (2021)
    Fisheries Research Institute | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20284 | 4230 | 2016-03-07 09:18:24 | 20284 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-09
    Description: Many haplochromine cichlids coexisted in Lake Victoria before the upsurge of Nileperch. The introduction of the Nile perch led to depletion of many haplochromines andother fish species in Lake Victoria. The impact of Nile perch predation onhaplochromines differed for different haplochromine trophic groups. Yssichromisfusiformis (G) and Yssichromis laparogramma (G) are among the species that havesurvived in the lake. Yssichromis spp. was studied with the aim of determining theirtrophic role, food and feeding habits. Samples were collected from Bugaia, Buvumachannel and Napoleon Gulf in the northern part of Lake Victoria. The food ofYssichromis spp. varied with size of fish. Both Y fusiformis and Y laparogramma fed onCopepods, Cladocerans, Chaoborus and Chironomids. Juvenile Yssichromis spp. fedexclusively on zooplankton comprising Cyclopoid copepods, Calanoid copepods andCladocera. The relative importance of Chironomid larvae and Calanoid copepods washigher in Bugaia than in Buvuma channel while Cyclopoid copepods and Chironomidpupae were relatively less important in Bugaia. The main food items that Yssichromisspp. fed on in Buvuma channel were Chironomid larvae Cyclopoid copepods,Cladocerans and Calanoid copepods. In Napoleon Gulf, fish caught from commercialfishery of Rastrineobola argentea (P) had fed on Chaoborus and Chironomids. Overall,Yssichromis spp. fed on more zooplankton in Buvuma than in Bugaia. Yssichromis spp.and R. argentea are presently the most abundant zooplanktivores in the northern part ofLake Victoria and are playing an important trophic role as major consumers ofzooplankton and insect larvae in the foodweb of the lake ecosystem. Yssichromis spp. arebridging the transfer of energy from the lower to the higher trophic levels as secondaryconsumers. The fishery is still not contributing to the direct conversion of the primaryproducts, the phytoplankton and detritus that were efficiently utilised by the diversehaplochromine trophic groups that existed before the Nile perch boom.
    Description: All chapters begin page 1. On title page: Ugandan version. Chapter 10.
    Keywords: Fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 1-29
    Format: 171
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  • 10
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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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