Microplastics Found in Ethiopian Fish as Research Reveals Fragmented Oversight

Microplastic particles have been detected in 35 to 61.7 percent of fish samples examined in Ethiopian studies, according to a new systematic review and bibliometric analysis published in the journal Discover Sustainability. The work, compiled by Tadele Assefa Aragaw and Michael Girimay Geberemedhine, synthesizes peer-reviewed research published between 2020 and May 2026 and offers the most comprehensive baseline yet of how microplastic pollution has been studied across Ethiopia's environmental compartments. The bibliometric component mapped the shape of the national research effort, and the picture it reveals is strikingly uneven.

Of the studies analyzed, 77.77 percent focused on freshwater systems, while drinking water systems and urban drainage systems accounted for 11.11 percent each. Sediment and surface water emerged as the predominantly studied environmental matrices, and only two studies examined biological samples, restricted entirely to fish. The authors note that the spatial distribution of research remains concentrated in freshwater environments with limited coverage of regional states, leaving large parts of the country effectively unmapped for microplastic occurrence.

The fish findings carry particular weight because they represent the clearest available signal of exposure moving up the food web. Although biota research is sparse, the detection of microplastics in more than a third and up to nearly two-thirds of sampled fish indicates ecological risk with potential socioeconomic and human health implications, the review concludes. The authors frame this as an indicator of environmental and ecological risk rather than a direct measurement of health outcomes in people, a distinction that matters given how little exposure research exists in the Ethiopian context.

Across environments and matrices, the physical signature of the pollution was consistent. Fragments and fibres with transparent coloration dominated the microplastic shapes reported in the reviewed studies. Polymer identification pointed to a familiar trio: polyethylene terephthalate, polyethylene, and polypropylene were the most frequently identified polymers in the Ethiopian samples.

One of the review's central findings is a methodological problem rather than an environmental one. Reported microplastic concentrations varied inconsistently among studies, reflecting differences in analytical approaches and reporting units. This heterogeneity, the authors argue, limits comparative cross-study analysis, meaning researchers cannot yet reliably pool Ethiopian data to build a coherent national picture of contamination levels.

The review identifies harmonized analytical methodologies as a priority for future work. On the governance side, the review documents a regulatory gap. Despite growing evidence of microplastic occurrence in aquatic environments and in the organisms inhabiting them, Ethiopia currently lacks dedicated regulatory frameworks addressing microplastic pollution and its impacts.

The authors argue that establishing such frameworks, alongside methodological standardization, is necessary to support effective management and mitigation of the pollution and to prevent human health problems. The study positions itself as a foundation for policy rather than a terminal assessment. By consolidating research trends, sources, pathways, exposure data, and the regulatory landscape into a single synthesis, the authors say the review provides guidance to improve governance of microplastic pollution, mitigate broader plastic pollution, and support sustainable environmental management in Ethiopia.

The work also underscores how much remains unknown: with biota sampling limited to fish in just two studies and regional coverage thin, the true geographic and ecological extent of microplastic contamination in the country remains largely unquantified. The review's baseline arrives as microplastic pollution has emerged as a major environmental, human health, and socioeconomic concern worldwide, yet remains fragmented in the Ethiopian evidence base.

Subject of Research: A bibliometric analysis and systematic review of microplastic pollution in Ethiopia

Article Title: A bibliometric analysis and systematic review of microplastic pollution in Ethiopia

Article References: Aragaw, T. A., & Geberemedhine, M. G. (2026). A bibliometric analysis and systematic review of microplastic pollution in Ethiopia. Discover Sustainability. https://doi.org/10.1007/s43621-026-05104-6

Image Credits: AI Generated

DOI: 10.1007/s43621-026-05104-6

Keywords: bibliometric, analysis, systematic, review, microplastic, pollution, Ethiopia, scientific research