Browsing by Author "Muyodi, Fredrick Jones"

Now showing 1 - 7 of 7
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    Beach Community-Designed System To Ameliorate Water Quality Deterioration in Catchments of Lake Victoria
    (The Open Environmental Engineering Journal, 2012) Muyodi, Fredrick Jones; Kapiyo, Raphael
    Water quality and socio-economic status of beach communities was studied in the Thruston Bay catchments of Lake Victoria. The major aim of the study was to establish the relation between water quality and socio-economic status of the communities in the study sites and come up with a sustainable community-designed system to control water quality degradation. Physico-chemical characteristics of water were determined on-site while total and fecal coliforms were determined in the laboratory using standard methods. The most probable number (MPN) technique was used to determine the total coliforms (TC) while the fecal coliform (FC) Test was used for testing the presence or absence of fecal coliforms. All sites tested positive for total and fecal coliforms. Borehole water had the highest MPN values followed by 10 m site. To compliment on the water quality data collected, a socio-economic status study of beach communities was conducted using questionnaires, structured interviews, focus group discussions and observations. Data and information on the demographic characteristics, asset ownership, livelihood activities, social facilities, health and sanitation, communication and outreach, solid waste and fisheries management and Beach Management Units (BMU) establishments, among others, was collected. A method in form of a model was designed using a participatory approach by the beach communities to be used to ameliorate lakeshore degradation by the communities in collaboration with other stakeholders.
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    Environmental Quality and Fish Communities in Selected Catchments of Lake Victoria
    (The Open Environmental Engineering Journal, 2011) Muyodi, Fredrick Jones; Mwanuzi, Fredrick L.; Kapiyo, Raphael
    Water quality and fish species are studied in selected catchments of Lake Victoria. The major aim of the study is to establish the relationship between the environmental quality and fish communities in the selected study sites of Lake Victoria. Physico-chemical characteristics of water in selected sites were determined on-site while nutrients and heavy metals were determined in the laboratory using standard methods. Fish samples were collected using experimental multifilament gillnets with varying mesh sizes. Fish identification was done using external morphological characteristics and identification keys. Physico-chemical results in Thruston bay revealed rise in water column temperature and turbidity as compared to those measured by earlier studies on the lake. Dissolved oxygen (DO) ranged from 0.9 mg L-1 in Yala catchment to 11.56 mg L-1 in Thruston bay. Phosphorus (P) ranged from 9.78 􀀁g L-1 to 120.67 􀀁g L-1 in Thruston bay and in Yala catchment, it ranged from 185.2 􀀁g L-1 to 1526.9 􀀁g L-1. The nitrate-nitrogen loading in the Geita catchment ranged from 130 to 7465 kg N between the years 2006 and 2008. The results in the inshore sites show a potential for higher photosynthetic rates than in the offshore sites implying that there is more food for the fish in the inshore sites than in the offshore sites. Results further reveal that in Thruston bay there are 13 fish species and Haplochromines dominate the fish catch in terms of numbers. Heavy metals including mercury resulting from artisanal and commercial gold mining in the Geita study site were also detected in the discharges into the lake. This paper also presents measures for the sustainable management of the lake environment, its quality and fisheries.
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    The evaluation of cage fish farming effects on water quality using selected benthic macro-invertebrate community parameters in the napoleon gulf, northern Lake Victoria
    (International Journal of Fisheries and Aquatic Studies, 2016) Nabirye, Hope; Mwebaza-Ndawula, Lucas; Bugenyi, FWB; Muyodi, Fredrick Jones
    Since the proliferation of cage fish farming in Uganda has raised concern over water quality deterioration, a study of the effects of cage fish farming on water quality in the Napoleon Gulf, Northern Lake Victoria was conducted during October 2012 to February 2013. Selected water column physicochemical parameters and benthic macro-invertebrates’ community parameters (i.e. numerical abundance, Shannon-Weaver diversity Index and modified Hilsenhoff Biotic Index) were analyzed monthly at both cage and non-cage sites. No significant differences were observed in physico-chemical parameter values, benthic macro-invertebrates’ numerical abundance and Hilsenhoff Biotic Index between cage and noncage sites. On the other hand Benthic macro-invertebrate species diversity differed significantly between the reference site and cage site 2 (P<0.05). Pollution tolerant Chironomus sp. and Melanoides tuberculata Muller, 1774 were significantly higher at the cage sites than the non-cage sites (P<0.05). These results suggest that cage fish farming significantly changed water quality.
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    Identification and characterization of fish breeding habitats on Lake Kyoga as an approach to sustainable fisheries management
    (Fisheries and Aquatic Sciences, 2023) Walugembe Nambi, Rebecca; Getahun, Abebe; Muyodi, Fredrick Jones; Obubu, John Peter
    Nile perch and Nile tilapia are major commercial species in Uganda, and thus require continuous production. However, their production is impacted by anthropogenic activities such as fishing in breeding habitats. The aim of this study was to identify and characterize Nile perch and Nile tilapia fish breeding habitats on Lake Kyoga. Water quality, lake bottom, fish and vegetation type samples were collected from 20 sites in April of 2021 and 2022. Key informant interviews were conducted with experienced fishermen at five fish landing sites. The water quality parameters indicated significant difference within the sites using analysis of variance. Sandy and muddy bottom types were equally spread at 40% each by use of a pie chart. Fish gonads showed no significant difference among the 20 sites. Bivariate correlation analysis of the vegetation types indicated a strong negative correlation with Nile perch while Nile tilapia had a positive correlation. Principal component analysis of the water quality, fish gonads and habitat vegetation components cumulatively contributed 82.5% in characterizing a fish breeding habitat. Four sites for Nile perch and four sites for Nile tilapia were characterized as breeding sites on Lake Kyoga and are recommended for mapping and gazettement as breeding habitats for sustainable fisheries management.
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    Impacts of Land Cover Changes on Catches of Nile Perch and Nile Tilapia on Lake Kyoga, Uganda
    (Fishes, 2023) Walugembe Nambi, Rebecca; Getahun, Abebe; Muyodi, Fredrick Jones; Rukuunya, Edward
    In East Africa, Nile perch and Nile tilapia are major commercial fish species, providing reliable protein and income sources. However, their stocks are dwindling on Lake Kyoga due to land use and land cover (LULC) changes within the surrounding catchment. Thus, this paper aims at assessing the land use land cover on Lake Kyoga and its immediate catchment and how those changes affect the water quality and the local fish catches. The Iso-Cluster tool in ArcGIS was used to analyze Landsat images from the years 1989 to 2021 to obtain LULC information. The LULC classes were classified into water, wetland, agricultural land, rangeland, and settlements. Correction using a 2-tailed test of the water quality parameters with the LULC classes indicated a strong positive correlation of TN with water (0.71), a strong negative correlation of TP with rangelands (􀀀0.83), and a strong positive correlation of Chl-a with settlement (0.98) at a 0.05 confidence level. The correlation of the recorded fish catch data with fishing gear showed a strong negative correlation with cast and monofilament nets. Continued use of illegal fishing gear was ranked number 1 of the causes of LULC by the stakeholders. Thus, the fisheries managers should collaborate with local stakeholders to boost declining fish catches for improved livelihoods and sustainable management.
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    Microbial safety assessment of recreation water at Lake Nabugabo, Uganda
    (African Journal of Environmental Science and Technology, 2015) Nakirya, Doreen; Okot-Okumu, James; Muyodi, Fredrick Jones
    This study assessed the microbial safety of Lake Nabugabo beaches for recreation. Faecal microbial indicators and physico-chemical characteristics of beach recreational water were determined. Water sampling was done between 10.00 and 11.30 h and 1700 and 18.00 h. Data was analysed using student ttests, ANOVA and spearman correlation (at 95%). Results were: total coliform (10.5-15.8 CFU/100 ml), faecal coliform (10-12.5 CFU/100 ml), Escherichia coli (0-2.63 CFU/100 ml), faecal streptococci (0-1.5 CFU/100 ml), all significantly different (P<0.05) from the control and electrical conductivity (27-32.6 μS/cm), pH (7.1), turbidity (12.6-26 NTU), total dissolved solids (13.2-15.4 mg/l), total suspended solids (12.6 - 13.4), colour (10.3 Pt-Co), alkalinity (29.3 mg/l), hardness (CaCO3) (32.5 mg/l), total nitrogen (1.3 mg/l), ammonium-N (0.6 mg/l), nitrate (0.05 mg/l), total phosphorus (0.8 mg/l), orthophosphates (0.02 mg/l), iron (0.2-0.3 mg/l), calcium (1.2-1.8 mg/l), magnesium (0.4-0.6 mg/l), sodium (1.2-2 mg/l), potassium (1.8-2.6 mg/l), all not significantly different (P > 0.05) from the control. Total coliforms and faecal streptococci exhibited significant correlation with TSS (r = 0.9, p = 0.04). Results indicate that Lake Nabugabo water is safe (WHO, US-EPA) for recreation.
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    The non-Haplochromis fish fauna in Uganda: an update on the distribution and a review of data gaps
    (Research Square, 2022) Akoth, Dorothy; Natugonza, Vianny; Efitre, Jackson; Muyodi, Fredrick Jones; Musinguzi, Laban
    Freshwater fishes are the second most threatened group of vertebrates after amphibians. In most developing countries, the conservation of freshwater fishes is largely hampered by limited information and data. The Red List assessments by the International Union for Conservation of Nature (IUCN) provide a benchmark for conservation and planning, but these assessments require, inter alia, quantitative information on the species range in the wild. This information is largely missing for many species that face extinction threats. In this paper, we combined species occurrence data, expert knowledge, and literature to review and update the distribution of non-Haplochromis fish species native to Uganda and determine their geographical extent relative to the global range. Results showed that (i) at least 110 non-Haplochromis species occur in Uganda, (ii) the current status in the entire native range for more than 60% of these species is unknown; (iii) five species previously known to occur in Uganda: Amphilius kivuensis, Bagrus degeni, Marcusenius macrolepidotus, Petrocephalus catostoma, and Lacustricola pumilus lack a native locus and hence not Ugandan fishes, (iv) 17 species occur in areas beyond their previously known range, and therefore, their presence needs further investigations, preferably by examining specimen collections, and (v) majority of the non-Haplochromis species native to Uganda have a wide distribution outside the national boundaries. We anticipate this information to be relevant both for the national and global IUCN Red List assessments for the non-Haplochromis fishes in Uganda. Furthermore, the identified data gaps will be relevant in prioritizing limited resources during surveys and collections.