Md. Ashfaq Sadat is a PhD researcher in the Department of Fisheries Management at Bangladesh Agricultural University, Bangladesh. His research focuses on aquatic pollution, particularly microplastics, pharmaceuticals and personal care products (PPCPs), and their ecological and toxicological impacts on freshwater ecosystems. His work integrates ecotoxicology, environmental chemistry, fish physiology, molecular biology, and spatial analysis to better understand the risks posed by emerging contaminants to aquatic organisms and food security. His current research investigates the occurrence, distribution, and ecological effects of microplastics in the Old Brahmaputra River and explores their role as vectors for pharmaceutical contaminants in Nile tilapia (Oreochromis niloticus). His broader research interests include aquatic ecology, environmental toxicology, sustainable aquaculture, fisheries management, One Health, GIS and remote sensing, and evidence-based environmental governance. Sadat is committed to interdisciplinary research that bridges science, policy, and conservation to promote the sustainable management of aquatic resources and safeguard ecosystem and public health. He actively collaborates with researchers from national and international institutions and is passionate about mentoring young scientists and advancing research capacity in environmental and fisheries sciences.