A5082501701- Aquatic Ecosystems and Biodiversity
- Fish Biology and Ecology Studies
- Aquatic Ecosystems and Phytoplankton Dynamics
- Aquaculture Nutrition and Growth
- Fish Ecology and Management Studies
- Marine and fisheries research
- Marine Bivalve and Aquaculture Studies
- Water Quality and Pollution Assessment
- Freshwater macroinvertebrate diversity and ecology
- Coastal and Marine Management
- Aquatic Invertebrate Ecology and Behavior
- Biological Control of Invasive Species
- Child Nutrition and Water Access
- Rangeland Management and Livestock Ecology
- Parasite Biology and Host Interactions
- Reproductive biology and impacts on aquatic species
- Coral and Marine Ecosystems Studies
- Aquaculture disease management and microbiota
- Heavy metals in environment
- Fish biology, ecology, and behavior
- Hydropower, Displacement, Environmental Impact
- Land Use and Ecosystem Services
- Environmental Toxicology and Ecotoxicology
- Global Maternal and Child Health
- Water Quality Monitoring Technologies
Kenya Marine and Fisheries Research Institute
2016-2025
Kisii University
2022
Pwani University
2022
Hokkaido University
2011-2014
University of Alabama
2010
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...
Abstract Fish catches in Lake Victoria have been on the decline while demand for fish has increasing. Cage culture with >3,000 cages, over 3 million tilapias and valued at US $ 12 is trying to fill gap. This study reviews development of cages need develop a decision support tool effective management. Existing literature data fisheries cage held by Kenya Marine Fisheries Research Institute ( KMFRI ) were used analysis. promising venture that may increase productivity, offer employment...
ABSTRACT High feed costs constrain tilapia production, making exploring low‐cost feeding strategies important. We assessed the growth of over a period 6 months, fed 1%, 2%, or 4% body mass day −1 with and without fertilization in 18 liner ponds stocked fingerlings (5.1 ± 0.71 g). Growth was significantly better fertilized than unfertilized ponds. The best (320.7 8.5 g) where fish were achieving 45% larger weight gain group These results show that fertilization, can be reduced by half while...
With the rapidly increasing trend of cage fish farming in freshwater, practices to enhance sustainability are increasing. We estimated how different levels phytase enzyme (0, 500, 1000, 2000, 4000 FTU kg−1) affects growth performance and nutrient load tilapia (5.2 ± 0.1 g) reared 15 cages for 180 days. The experimental design followed a completely randomized approach, with three replicates. most significant increase was observed groups that were given diet supplemented at kg−1 feed. These...
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 The present study demonstrates the declining state of major commercial fisheries Lake Victoria, Kenya, a situation threatening sustainability lake's fishery. Data in were derived from resource monitoring programmes that included hydro‐acoustics (2009–2018), trawl net fishing (2011–2018), frame surveys (2000–2016) and catch assessment (2000–2015). activities provided information on fish stocks supported advice for management. average stock densities Tanzania, Uganda Kenya 8.92, 8.25...
The impact of population expansion through economic growth and development has been identified as one the key drivers both water sediment contamination from potentially harmful elements (PHEs). This presents a major hazard not only to aquatic ecosystems but local riparian communities beyond who rely heavily on this natural resource for drinking fish-a valuable source dietary micronutrients protein. present study measured biogeochemical concentration PHEs in water, fish locations pooled into...
Management efforts for the Lake Victoria Basin have been hampered by a lack of clear standards against which to judge degree environmental degradation, highlighting need multi-metric approach this purpose. Indeed, management priorities catchment must be based on reliable assessments biological integrity inflowing rivers that can potentially influence ecological functioning lake. Accordingly, macroinvertebrate metrics were evaluated their responsiveness human impacts, utilizing Pearson's...
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...
The economic viability of tilapia cage culture in Lake Victoria was assessed using a profitability analysis model as the main decision support tool. One and five cages 8 m3 (A), 62.5 (B), 471 (C) were assessed. break-even price (US$4.6 kg−1) for one A appeared higher than farm gate Kenya (US$3.5 kg−1), suggesting unprofitability venture. decreased relative to increase numbers showed economies scale throughout volume ranges. longest payback period (PBP) (8 years) implied risky This reaffirmed...
The objective of this study was to survey and document pesticide residue levels in the lower Nyando/Sondu-Miriu catchment areas Lake Victoria, Kenya, during dry rainy seasons 2009. Water sediment samples from Basin were analysed for selected residues, using gas chromatography equipped with Ni63 CP-SIL 8CB-15m TSD detectors organochlorine organophosphorus respectively. findings indicated that banned organochlorines are still being used catchment. Dieldrin p,p′-DDD notably higher (P < 0.05)...
Benthic macroinvertebrates from Rivers Kipkaren and Sosiani in the upper reaches of River Nzoia basin, Kenya, were sampled semi-quantitatively monthly December 2006 to May 2007 using a 0.5 mm mesh size scoop net riffles, pools runs. Seven sampling sites selected on areas rivers along longitudinal gradient relation anthropogenic impact. Physico-chemical parameters measured in situ, while specific chemical determined calometrically laboratory standard methods. Habitat land use characteristics...