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  • 1
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    Report on Fourth FIDAWOG Workshop held in Kisumo, 16 to 20 August 1999: summary of proceedings (2021)
    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
    Details
    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
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    Format: 1-8
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  • 2
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    Distribution and abundance of fish stocks in Lake Victoria, Tanzania (2021)
    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
    Details
    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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  • 3
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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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  • 4
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    Current status of the fish stocks of Lake Victoria (Uganda) (2021)
    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
    Details
    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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  • 5
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    The status of the artisanal fishery of Lake Victoria, Kenya, with notes on improvements to the catch data collection system (2021)
    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
    Details
    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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  • 6
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    Relative abundance and distribution of fish in Kenyan waters of Lake Victoria (2021)
    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
    Details
    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
    Format: application/pdf
    Format: application/pdf
    Format: 46-62
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  • 7
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    Catch trends from Lake Victoria - Tanzanian waters (2021)
    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
    Details
    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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  • 8
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    Selectivity of gillnets for Nile perch, Lates niloticus (L.), in Lake Victoria, Kenya (2021)
    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
    Details
    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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  • 9
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    The role of Caridina nilotica (Roux) in the Lake Victoria fisheries with reference to Lates niloticus (L.) (2021)
    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
    Details
    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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  • 10
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    Species composition and relative abundance of zooplanktivorous haplochromines in the northern portion of Lake Victoria (Uganda) (2021)
    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
    Details
    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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  • 11
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    Reproductive biology of Oreochromis niloticus (L.) in the Nyanza Gulf of Lake Victoria (2021)
    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
    Details
    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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  • 12
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    Changes in feeding biology of Nile tilapia, Oreochromis niloticus (L.), after invasion of water hyacinth, Eichhornia crassipes (Mart.) Solms, in Lake Victoria, Kenya (2021)
    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
    Details
    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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  • 13
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    Invertebrate communities in northern Lake Victoria, with reference to their potential for fishery production (2021)
    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
    Details
    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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  • 14
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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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  • 15
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    Growth parameters for Lates niloticus (L.), Bagrus docmak (Forsskal), Oreochromis niloticus (L.), Clarias gariepinus (Burchell) and Synodontis species derived from tag returns (2021)
    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
    Details
    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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  • 16
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    Distribution of Oreochromis niloticus (L.) in the Ugandan waters of Lake Victoria (2021)
    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
    Details
    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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  • 17
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    Zooplankton - fish interaction in the littoral zone of Nyanza Gulf, Lake Victoria (2021)
    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
    Details
    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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  • 18
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    Fish species identification guide for Lake Victoria: enumerator's field guide (2021)
    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
    Details
    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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  • 19
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    Food of the haplochromine species surviving in the nearshore areas of Lake Victoria with specific reference to Napoleon Gulf (2021)
    Fisheries Resources Research Institute | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20283 | 4230 | 2020-09-04 01:28:52 | 20283 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-09
    Description: In this paper, the food and feeding habits of the surviving haplochromine cichlids was examined to assess whether the diet of the different trophic groups had changed and what role the haplochromine species still surviving in the lake are playing in the overall trophic ecology of the lake.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
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    Format: 1-14
    Format: 15
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  • 20
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    The diversity of aquatic flora and their importance in the Victoria and Kyoga lake basins (2021)
    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20230 | 4230 | 2016-02-26 16:00:23 | 20230 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-08
    Description: A great part of Uganda is endowed with water bodies in the forms of rivers and open water lakes. These bodies are never alone. They are either flanked or associated with plants, which are adapted to the wet conditions. They are so characteristic that they are part and parcel of the aquatic ecosystems. They occupy various positions depending on the amount of water in the relevant habitats.
    Description: On title page: The Ugandan Version
    Keywords: Biology
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 33-38
    Format: 90
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  • 21
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    The Fishes and Fisheries of the Victoria and Kyoga Lake Basins (2021)
    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
    Details
    Publication Date: 2021-07-09
    Description: Most fish in Uganda comes from lakes Victoria, Albert, Kyoga, Edward, George, about 160 minor lakes and rivers. Fish production of most lakes in Uganda has changed considerably since development of most of the fisheries started during the first half of the 20th century. Analysis of the changes that have taken place in these fisheries provides useful information on the potential and management issues associated with fisheries in Uganda. Total national fish catch statistics are not available for the period prior to 1960. The trends in total fish production from the different water bodies between 1961 and 1995 are illustrated in Figure 3. Total fish catches were 60,000 to 71,000 metric tonnes between 1961 and 1965 and increased after 1965 reaching a peak of 245,000 metric tonnes in 1990. The increase from 1965 to the late 1970s followed establishment of introduced Nile perch and Tilapiines to Lake Kyoga which reached a peak in 1978 and then declined. The second peak followed establishment of the same introduced species in Lake Victoria. This too peaked in 1990 after which catches declined. During I970s, most of the fish came from Lake Kyoga while during the 1980s it was from Lake Victoria. Although the above trend shows an increase in total fish catches, historical trends in fisheries have been of decreasing catches especially of more desirable species. This impression can only be appreciated through examination of historical changes in individual fish production systems. The trend in total catches from major water bodies is illustrated in Figure 4. A brief analysis of the fish stocks and fish production from the different water and the efforts to manage the fisheries of the major lakes is given.
    Description: On title page: (The Ugandan Version)
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 1-13
    Format: 13
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    Application of fish biology in management of the fisheries (2021)
    Fisheries Resources Research Institute | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20767 | 4230 | 2020-09-07 20:35:30 | 20767 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-12
    Description: All biological aspects of the stock are of scientific interest. Specific biological parameters are used either in estimating; yield, or providing a basis for suggesting fisheries management strategies, growth, mortality and stock size are the main determinants of yield, and aspects such as the timing of spawning and recruitment are important in considering management measures.In fisheries science, fish biology contributes in two broad areas;a) Basic biology and distribution of resource spp b) Population dynamics of the species An exploited fish stock is viewed as a simple biological system consisting of stock-biomass which is increased by growth and recruitment, and is reduced by natural-mortality and fishing mortality.
    Description: ACP - EU Fisheries and Biodiversity Project
    Keywords: Biology ; Fisheries
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 1-11
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    The role of nearshore areas and other refugia in survival of fishes especially haplochromines in Lake Victoria, with specific reference to Napoleon Gulf (2021)
    National Fisheries Resources Research Institute (NaFIRRI) | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/20243 | 4230 | 2020-09-04 01:32:47 | 20243 | National Fisheries Resources Research Institute, Uganda
    Details
    Publication Date: 2021-07-08
    Description: Before introduction and establishment of the Nile perch Lales nilolicus, haplochromines were the most abundance group of fishes in Lake Victoria, Kyoga and Nabugabo. They formed at least 83%, by weight of the fish biomass in Lake Victoria up to early 1980s (Kudhongania & Cordone 1974, Okaronon el ai, 1985). They occupied virtually all trophic levels and played an important role in the flow of organic matter in these ecosystems. Each species had its own unique combination of food and habitat preference (van Oijen 1982, Goldschmidt el al 1990). Up to eleven trophic groups were identified in the Mwanza Gulf van Oijen op cit.). These included; phytoplanktivores, detritivores, algal grazers, plant eaters, molluscivores, parasite waters,phyoplanktivores, insectivores, piscivores, paedophages, and scale eaters. The detritivorous phytoplanktivores and the pelagic phytoplanktivores together constituted about 50% of the total haplochromine biomass in the lake (Goldschmidt 1986, Witte & van Oijen 1990).
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 132-163
    Format: 32
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    Some aspects of the ecology and reproduction of the small pelagic cyprinid, Rastrineobola argentea in Lake Victoria (2021)
    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/3697 | 424 | 2011-09-29 17:02:37 | 3697 | Lake Victoria Fisheries Organization
    Details
    Publication Date: 2021-06-29
    Description: This study concentrated on the reproductive biology of the small pelagic cyprinid Rastrineobola argentea. The results indicate that this fish is an inshore spawning species, which agrees with other recent studies. It was also found that in areas where fishing intensity was likely to be relatively high, the size at first maturity of R. argentea was reduced, which is likely to be an effect of the fish altering its reproductive strategy according to life history theory. The CPUE results showed a general trend of decreasing with distance from shore, however areas less than one kilometer from the shore were not sampled. Evidence was also found suggesting that the cestode parasite, Ligula intestinalis had an adverse effect on the maturation and fecundity of R. argentea. Some management options concerning the findings in this study are also briefly discussed. (PDF has 82 pages)
    Description: Republic of Kenya
    Description: Republic of Uganda
    Description: United Republic of Tanzania
    Description: European Development Fund (7ACP-RPR-372)
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/01/12
    Keywords: Fisheries ; Biology ; Africa ; Lake Victoria ; catch effort ; fecundity ; lake fisheries ; reproduction ; size distribution ; spawning populations ; Rastrineobola argentea
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 1-71
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  • 25
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    Reproductive biology of Orechromis niloticus (L.) (Pisces: Cichlidae) in the Nyanza Gulf of Lake Victoria (2021)
    Fisheries Data Working Group of the Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/3753 | 424 | 2011-09-29 16:57:54 | 3753 | Lake Victoria Fisheries Organization
    Details
    Publication Date: 2021-06-25
    Description: Fish samples were collected using seine and trawl nets in Nyanza Gulf, Lake Victoria (Kenya) in order to study the reproductive and gonadal patterns of Oreochromis niloticus; samples were collected from June 1998 to February 1999. The variation in relative condition factor and monthly variation in gonad weight showed spawning took place between June and July. Most ripe fish were recovered between November and February, while a slight drop in GSI for males was noted between November and January. External factors triggering reproductive strategy are now being addressed
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/06
    Keywords: Fisheries ; Biology ; Africa ; Lake Victoria ; Kenya ; Nyanza ; Lake Victoria ; Nyanza Gulf ; condition factor ; freshwater fish ; gonads ; reproductive behaviour ; spawning ; Oreochromis niloticus
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 63-67
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    The distribution and abundance of Copepoda and Cladocera in the Lake Victoria, Kenya (2021)
    Fisheries Data Working Group of the Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/3742 | 424 | 2011-09-29 16:56:46 | 3742 | Lake Victoria Fisheries Organization
    Details
    Publication Date: 2021-06-29
    Description: Fourteen stations were sampled in the Kenyan waters of Lake Victoria in order to assess distribution and abundance of zooplankton. Seven stations were selected in the Nyanza gulf while the rest were in the open waters of the lake. Zooplanktons samples were collected monthly from November 1998 to January 1999, using a 1.5 m long Nansen type plankton net of 243 mu m mesh size and 50 cm diameter. Representative specimens were dissected and identified to species level
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/06. This article was also published in LVFRP/TECH/99/07 as follows: Omondi, R. (1999) The distribution and abundance of Copepoda and Cladocera in the Lake Victoria, Kenya In: Report on Fourth FIDAWOG Workshop held at Kisumu, 16 to 20 August 1999, pp. 127-141.
    Keywords: Fisheries ; Biology ; Africa ; Lake Victoria ; Kenya ; Nyanza ; Kisimu ; Lake Victoria ; Winam Gulf ; abundance ; distribution ; species diversity ; zooplankton ; Cladocera ; Copepoda ; Lates niloticus ; Oreochromis niloticus ; Rastrineobola argentea
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 38-47
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