A5058949708- Aquatic Ecosystems and Biodiversity
- Fish Biology and Ecology Studies
- Aquatic Ecosystems and Phytoplankton Dynamics
- Water Quality and Pollution Assessment
- Biological Control of Invasive Species
- Fish Ecology and Management Studies
- Rangeland Management and Livestock Ecology
- Aquaculture Nutrition and Growth
- Fish biology, ecology, and behavior
- Urban Stormwater Management Solutions
- Child Nutrition and Water Access
- Marine and fisheries research
- Marine Bivalve and Aquaculture Studies
- Soil and Water Nutrient Dynamics
- Hydrology and Watershed Management Studies
- Wastewater Treatment and Reuse
- Fecal contamination and water quality
Kenya Fisheries Service
2022-2023
Kenya Marine and Fisheries Research Institute
2014-2023
Mapping of lacustrine aquaculture and socio-economic assessment cage farmers operations can be employed as decision support tools in an integrated fashion for fisheries management. We simultaneously mapped reported the location cages characterized indicators farming Lake Victoria, Kenya. Structured questionnaires interviews from generated data management information. Vital water quality parameters were analyzed selected sampling sites. Cage culture was found to a male-dominated activity with...
Lake Victoria, bordered by Kenya, Tanzania, and Uganda, provides one of the largest freshwater fisheries in world supports millions small-scale fishing communities. Historical environmental change, including population growth, nutrient loading, introduced invasive species, rising temperatures, has resulted eutrophication persistent cyanobacterial harmful algae blooms (cyanoHABs) over recent decades, particularly shallower gulfs, bays, inlets. CyanoHABs impact food web dynamics compromise...
Abstract Monitoring of aquatic pollution is important for ascertaining the relationship between fisheries and general ecosystem health a lake. This study evaluated use changes in indicators Lake Victoria, Kenya, as decision support tool management productivity. Principal component analysis ( PCA ; R 2 ≥ 0.5, P < 0.05) physical chemical parameters delineated sampling sites into ecological cluster zones consisting inner gulf (C1), mid‐gulf (C2) open lake (C3). Test results lead (Pb) mercury...
Abstract Fisheries management uses important fish market information and from Communication Technology ( ICT ) to improve trade by identifying inefficiencies, inequity post‐harvest losses. The current study reports fisheries output using at major landing sites markets in Kenya Uganda the Marine Research Institute KMFRI Enhanced Fish Market Information Service EFMIS database for 2009 – 2017. Catch assessment survey data validated use of drawing conclusions. Regional Frame Survey provided...
Water samples for physico-chemical analysis this study were collected monthly five years between April 2008 and March 2013. Conductivity, temperature, dissolved oxygen pH was measured in situ using a Surveyor II model hydrolab. Chlorophyll-a concentration determined Genesys 10S Vis spectrophotomer. Nutrients standard methods procedures. Analysis of Variance (ANOVA) used to determine spatial temporal variation biological factors. Principal component (PCA) performed establish the correlation...
Abstract Fisheries resources in vital freshwater ecosystems have been reported to be under immense threat, resulting conflicts between conservation, management and exploitation. This study established requirements for identifying mapping fish breeding nursery grounds such the Kenyan part of Lake Victoria. The criteria were characterised by use indigenous knowledge, field data, literature on sites, macroinvertebrates distribution, larval relative abundances, digitisation, participatory...
Lake Victoria, the largest lake in tropics, has a storied history that includes recent shifts ecology due to variety of point and nonpoint source anthropogenic impacts. Among expanding industries contributing environmental impacts (if not properly managed) is rapid expansion cage aquaculture Nile tilapia ( Oreochromis niloticus ). As part an effort assess ecological consequences this new industry, unmanned aerial systems (UAS), very high-resolution satellite imagery, geographic information...
Abstract HRBS-GLWNB 2020 presents the first open-source and high-resolution bathymetry, shoreline, water level data for Lakes Victoria, Albert, Edward, George in East Africa. For each Lake, these have three primary products collected this project. The bathymetric datasets were created from approximately 18 million acoustic soundings. Over 8,200 km of shorelines are delineated across lakes satellite systems uncrewed aerial vehicles. Finally, tied together by creating lake surface elevation...
Abstract Fisheries governance uses policy and statutory documents to improve on fish ecology, harvesting, trade consumption by identifying addressing gaps regarding inefficiencies, inequity post‐harvest losses. The current study examines existing policies institutional fisheries, health assess the level of inclusion small indigenous species (SIS), especially Omena, as a means guiding interventions for sustained livelihoods fishing communities in Lake Victoria. A content‐analysis review was...
Abstract The present study demonstrates the application of a multi‐metric Phytoplankton Index Biotic Integrity (PIBI) approach for ranking major river catchments in Kenyan part Lake Victoria on basis their pollution status. index utilizes water quality and zooplankton data, phytoplankton diversity, abundance attributes, as well literature information. rivers were sampled from 2016 to 2018 during wet season (March) dry (July). separation power Mann–Whitney U test ( p < .05) qualified eight...
Increased nutrient concentrations have been linked to water quality impairments across the world. In Lake Victoria, second largest freshwater lake in world, decades of eutrophication challenged management and led conditions with compromising levels cyanobacteria cyanotoxins. Our study focuses on Winam Gulf, where a resurgence hyacinth has renewed challenges navigation anoxia, but also may present local-scale opportunity for improvements. Over course 1.5 years, we conducted three, situ...
Abstract We present a GIS‐based approach to the delineation of areas that have different levels suitability for use as tilapia cage culture sites Kenyan part Lake Victoria, Africa. The study area was 4,100 km 2 . method uses high‐resolution bathymetric data, newly collected water quality data from all major fishing grounds and sites, existing spatial information previous studies. parameters considered are depth, temperature, dissolved oxygen, chlorophyll‐ concentrations, distances lake...
The extent of flooding in vulnerable inland and lacustrine systems can demonstrate the coverage magnitude such phenomenon for policy enhancement. This study examined due to rising water levels selected Afrotropical lakes guide interventions that would sustain livelihoods communities affected. years were most prone (2010 2020) used as a baseline extraction changes spatial area shoreline, rainfall satellite altimetry data, using geospatial remote sensing technologies. was strongly but...
Abstract We present the Multi-metric Index of Biotic Integrity methodological approach that allows for ranking major river catchments based on pollution status in Kenyan portion Lake Victoria, Africa. The study has a broader applicability to all other African Great Lakes, and lakes have riverine discharge. method presented utilizes water quality environmental data, local knowledge, pre-existing literature. parameters considered were sampled from 2016 2018 during dry season (July sampling)...