Beata Irena Cejko is a Polish researcher specializing in fish reproductive biology, with particular emphasis on gamete quality (eggs and sperm), sperm storage under reduced metabolic conditions, sperm cryopreservation, and reproductive techniques in conservation aquaculture. She works as a Professor at the National Inland Fisheries Research Institute in the Department of Salmonid Research. Her recent work focuses on the reproductive biology of wild fish species, such as whitefish (Coregonus maraena) and northern pike (Esox lucius). She is passionate about promoting sustainable aquaculture through innovative reproductive methods.