Gift Samuel David
President's Doctoral Scholar


About Me
I am a President’s Doctoral Scholar in the Shiels Lab, focusing on the impacts of micro/nanoplastics and their ecocorona properties on freshwater fishes, specifically Cypriniformes and Gasterosteiformes. My research examines ecotoxicological risks, physiological and behavioural changes in these species, and implications for food safety and security. My academic journey has covered diverse areas, including microplastic pollution in aquatic environments, marine ecotoxicology, sustainable aquaculture, aquaculture nutrition, and biomonitoring contaminants of emerging concern.
My Background
I earned my first degree in Fisheries and Aquaculture from the University of Uyo, Nigeria, where I evaluated the growth performance of Clarias gariepinus using on-farm and commercial feeds. Over the next five years, I worked as a Research Assistant at the University of Uyo, honing skills in experimental design, statistical analysis, data interpretation, and manuscript preparation. My research focused on sustainable aquaculture, food security, and the impacts of freshwater and marine pollution.
Driven to explore the specific impacts of microplastics, I pursued an MSc in Pollution and Environmental Control at the University of Manchester as a Commonwealth Scholar, investigating the accumulation and distribution of microplastics in the River Tame, Greater Manchester. This sparked a deeper interest in the interactions between micro/nanoplastics and aquatic life, leading me to a second MSc in Marine Biological Resources at Ghent University as an Erasmus Mundus Scholar. My projects included: characterising microfibres in the guts of commercial fish along the South African coast; Assessing the effects of pharmaceuticals (e.g., paracetamol) on calanoid copepods; and assessing the histopathological changes of blue mussels (Mytilus edulis) exposed to anthropogenic pollutants.
My overarching goal is to unravel the intricate interactions between contaminants of emerging concern and aquatic ecosystems, with a focus on micro/nanoplastic pollution in pelagic and benthic communities. Currently, under the supervision of Prof. Holly Shiels, Dr. Cyrill Bussy, and Dr. Ian Kane, my PhD research investigates how microplastics, their ecocorona properties, and environmental factors influence the well-being and growth of freshwater teleosts.
Throughout my career, I have demonstrated a strong dedication to environmental sustainability, coupled with advanced research skills. I am committed to making meaningful contributions to the field of aquatic ecotoxicology, bridging science and environmental conservation.
Funding & Academic Achievements
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President’s Doctoral Scholar (PDS) Award at the University of Manchester [2024]
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Erasmus Mundus Scholarship tenable at Ghent University and partner institutions for MSc in Marine Biological Resources [2022]
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Commonwealth Masters Scholarship tenable at the University of Manchester for MSc Pollution and Environmental Control [2021]
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MSc Marine Biological Resources (Distinction) – Ghent University and 4 other institutions – 2024
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MSc Pollution and Environmental Control (Distinction) – University of Manchester – 2022
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BSc Fisheries and Aquaculture (First Class Hons) – University of Uyo - 2017
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Certificate of Achievement, awarded for 2nd Place Talk (Afternoon Oral Session) at the Doctoral Academy Graduate Society Symposium [2025].
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PDS External Development Fund 2025 to attend a Fish Swimming course (FHL 528) at Friday Harbor Laboratories, University of Washington, USA [2025].
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Stephen and Ruth Wainwright Endowed Fellowship to attend a Fish Swimming course (FHL 528) at Friday Harbor Laboratories, University of Washington, USA [2025].
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Fisheries Society of the British Isles (FSBI) Travel Grant 2025 to attend a Fish Swimming course (FHL 528) at Friday Harbor Laboratories, University of Washington, USA [2025].
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The Company of Biologists Travel Grant, in association with the Society for Experimental Biology (SEB), to attend a Fish Swimming course (FHL 528) at Friday Harbor Laboratories, University of Washington, USA [2025].
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PDS Conference Travel Fund 2025 to attend and present at the Biologists@100 conference in Liverpool, between March 24th and 27th, 2025 [2025]
External Training

I had the opportunity to travel to Friday Harbor Labs in the stunning Pacific Northwest, where I immersed myself in the world of marine physiology. During my time there, I explored the biomechanics of fish swimming, uncovering how kinematics, ecomorphology, behaviour, and environmental physiology shape the way aquatic species move and thrive.


Public Engagement
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University of Manchester Rep for 2021-2022 where I cultivated connections and facilitated collaborative initiatives among Commonwealth scholars at The University of Manchester, United Kingdom, fostering a vibrant and supportive community.
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Host and Speaker at several youth development initiative since 2021, including - scholarship made easy; a guide to Erasmus Mundus Scholarships; winning an international scholarship as a young person from a developing country; leveraging international opportunities for enhancing your career in agriculture; and getting it right at first attempt (Commonwealth and Chevening Application Guidelines), hosted by different educational youth-led initiatives.
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Educational and public awareness outreach as a Time-out member of Aquaworld Community Development Initiative, where I host webinars and write blogs on the impacts of plastic pollution on the freshwater and marine environment.
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Speaker on radio (2020-2021) - How to successfully start a homestead and small-scale aquaculture venture.
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Secretary (2015) and then President (2016) of the Fisheries and Aquatic Environmental Management Students’ Association, University of Uyo Chapter.
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Presented my research at the Biologists @100 conference, Liverpool (2025); UoM SMS PGR showcase (2025); NEOPA Symposium (2025); DAGS Symposium (2025) and UoM SBS Annual Event (2026).
Publications
Heavy Metals Contamination in Fish: Effects on Human Health. https://doi.org/10.22259/2638-5481.0204002
Plastic waste in the aquatic environment: Impacts and Management. In: Analysis of Nanoplastics and Microplastics in Food. https://doi.org/10.1201/9780429469596-2
Zooplankton Assemblages of a Tropical Coastal Creek, South-Eastern Nigeria. https://doi.org/10.3923/ecologia.2020.63.70
Studies on the effects of feeding levels on growth response and nutrient utilization of Heteroclarias (hybrid catfish). https://doi.org/10.3923/jas.2019.725.730
Optimizing environmental decisions on plastics as vectors of chemical pollutants in marine environments of Southeast Asia, South Asia, and East Asia: A comprehensive systematic review. https://doi.org/10.1016/j.seares.2026.102692
Assessment of Microplastic Contamination in Commercially Important Fish Species From the Old Brahmaputra River and Its Environmental Health Impact. https://doi.org/10.1002/clen.70149
Occurrence and human health risks of microplastics in the Bay of Bengal using Perna viridis as sentinel species. https://doi.org/10.1016/j.ceja.2026.101039
Genetic Disruptions Induced by Marine Invasive Species: Implications for Biodiversity, Evolutionary Trajectories, and Ecosystem Resilience. https://doi.org/10.1111/maec.70074
Recent advances in biochar technology for aquatic pollution control: A critical review of applications, barriers, and future opportunities. https://doi.org/10.1007/s43621-025-01581-3
Heavy Metal Accumulation and Nutrient Composition in Erpetoichthys calabaricus: Environmental and Human Health Implications. https://doi.org/10.3923/ajbs.2025.432.442









