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  • stock assessment  (15)
  • Cell & Developmental Biology
  • Deutschland
  • Inorganic Chemistry
  • Jinja, Uganda  (15)
  • California Department of Fish and Game, Marine Resources Operations
  • Silver Spring, MD
  • 1
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    The design of multimesh, multidepth gillnet fleets for use in the Lake Victoria Fisheries Research Project (2021)
    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
    Details
    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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  • 2
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    Preliminary surveys of the fish and fisheries of the Nzoia, Nyando and Sondu Miriu rivers, Kenya (2021)
    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
    Details
    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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  • 3
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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
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    Format: application/pdf
    Format: 1-8
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  • 4
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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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  • 5
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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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  • 6
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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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  • 7
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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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  • 8
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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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  • 9
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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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  • 10
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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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  • 11
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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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  • 12
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    Report on third FIDAWOG Workshop held at the Triangle Hotel, Jinja, 29 March to 1 April 1999: summary of proceedings (2021)
    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/3689 | 424 | 2011-09-29 17:02:00 | 3689 | Lake Victoria Fisheries Organization
    Details
    Publication Date: 2021-06-28
    Description: The FIDAWOG workshop held from 29 March to 1 April 1999 in Jinja was the third major stock assessment workshop attended by most of the participants during the project. It followed two workshops, each of which lasted three weeks, held in 1998.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/06; The document includes an appendix with all the papers presented at the workshop
    Keywords: Fisheries ; Limnology ; Africa ; Lake Victoria ; stock assessment
    Repository Name: AquaDocs
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    Format: application/pdf
    Format: application/pdf
    Format: 1-16
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  • 13
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    Water quality and nutrient dynamics - Lake Victoria, Kenya (2021)
    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/3674 | 424 | 2011-09-29 17:01:26 | 3674 | Lake Victoria Fisheries Organization
    Details
    Publication Date: 2021-06-28
    Description: Limnological studies in Lake Victoria (Kenyan portion) have been sporadic. Water quality and nutrient dynamics studies are being undertaken in fifteen sampling sites that have been divided into four ecological zones namely: Nyanza Gulf, Rusinga Channel, open waters inshore and open waters. The ongoing study will show how the physical and chemical paramenters affect fish distribution and abundance.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Fisheries ; Limnology ; Africa ; Kenya ; Lake Victoria ; water quality ; nutrient dynamics ; stock assessment
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 118-126
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  • 14
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    The fish stocks of Lake Victoria, Uganda (2021)
    Fisheries Data Working Group of the Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/3756 | 424 | 2011-09-29 16:58:05 | 3756 | Lake Victoria Fisheries Organization
    Details
    Publication Date: 2021-06-25
    Description: An experimental bottom trawl survey was carried out in the Uganda sector of Lake Victoria from November 1997 to December 1998 to estimate the composition, distribution, and abundance of the major fish species. In 12 cruises, 295, thirty-minute hauls were taken in waters from 4-60 m deep. Nile perch, Lates niloticus (L) made up 95% of the catch by weight. Haplochromine cichlids and L. niloticus occurred in all areas sampled while Nile tilapia, Oreochromis niloticus (L.) and other tilapiines were restricted to waters less than 30 m deep. In waters deeper than 40 m, catches were generally near zero. Species diversity and abundance decreased with increasing water depth. In waters less than 30 m deep, the area where the artisanal fishermen operate, the mean catch was 126kg hr super(1)
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/06
    Keywords: Fisheries ; Uganda ; Lake Victoria ; abundance ; bottom trawls ; composition ; distribution ; fishery resources ; fishery surveys ; lake fisheries ; species diversity ; stock assessment ; Lates niloticus ; Oreochromis niloticus
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 30-37
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  • 15
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    Stock assessment of Lates niloticus (L.), Oreochromis niloticus (L.) and Rastrineobola argentea (Pellegrin) using fisheries-dependent data from Tanzania waters of Lake Victoria (2021)
    Lake Victoria Fisheries Research Project | Jinja, Uganda
    In:  http://aquaticcommons.org/id/eprint/5063 | 424 | 2011-09-29 15:29:54 | 5063 | Lake Victoria Fisheries Organization
    Details
    Publication Date: 2021-07-08
    Description: Three commercially important fish species, Lates niloticus (L.), Rastrineobola argentea (Pellegrin) and Oreochromis niloticus (L.) that are fished by artisanal fishermen of Lake Victoria, Tanzania part, were studied in Kagera, Mwanza and Mara beaches from October 1997 to July 1999. Catches, effort, exploitation and stock structure were investigated. Beaches for sampling were selected based on importance for landing the above named fish species. The number of boats found on beach that day, the number that lay idle and their means of propulsion were recorded. As many boats as possible were sampled for gear type and gear size. The catches were sorted into species and measured. Variation in the species and size composition of landings was observed between regions, between months and between gears used. The implications of the findings to management are discussed.
    Description: Lake Victoria Fisheries Research Project Phase II
    Description: LVFRP/TECH/99/07
    Keywords: Fisheries ; Management ; Africa ; Tanzania ; Lates niloticus ; Oreochromis niloticus ; Rastrineobola argentea ; stock assessment ; artisanal fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 108-117
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