Professor Dr. Habil. Ioan Valentin Petrescu-Mag is a senior academic and researcher with extensive expertise in ichthyology, aquaculture, evolutionary biology, and environmental sciences, distinguished by a strong interdisciplinary approach that integrates genetics, ecology, and ecotoxicology. He holds habilitation rights to supervise doctoral research, reflecting his established leadership in academic mentoring and advanced research training. His scientific trajectory is rooted in a PhD focused on the genetics of sex determination and differentiation in poeciliid fishes, particularly Poecilia reticulata, where he contributed to understanding the architecture and dynamics of sex-linked traits, Y-chromosome inheritance, and the mechanisms underlying sexual polymorphism. This line of inquiry has positioned him among specialists investigating sex chromosome evolution and the inheritance of quantitative traits in livebearing fishes. Further consolidating his expertise, his postdoctoral research addressed the ecotoxicology of endocrine-disrupting compounds, with a focus on their physiological and reproductive impacts in aquatic organisms. His work explored mechanisms of hormonal interference, including experimental studies on estrogenic and androgenic compounds affecting fish development and sex ratios, thereby contributing to a broader understanding of anthropogenic stressors in aquatic ecosystems. Professor Petrescu-Mag has developed a robust and diversified research portfolio that covers ichthyology and aquaculture science, including breeding technologies, reproductive performance, and physiological responses in freshwater fish species such as rainbow trout and poeciliids, addressing both applied aquaculture systems and biodiversity-oriented fish production strategies. He has also made significant contributions to aquarium science and experimental fish biology, particularly in the field of ornamental fish, focusing on behavioral ecology, stress physiology, and environmental tolerance, including hypoxia resistance, thermal stress, and reproductive strategies. A central pillar of his career is represented by research on poeciliids and guppy genetics, encompassing gene mapping, sex-linked inheritance, crossing-over phenomena, and phenotypic variability, as well as the development of methodologies for producing supermales with YY genotypes and for manipulating sex ratios in guppies. His work further extends into ecology and conservation biology, including biodiversity conservation, assessments of endangered fish species, and the study of ecological interactions that shape phenotypic traits in natural populations. In parallel, he has contributed to ecotoxicology and environmental monitoring through studies on heavy metal accumulation, endocrine disruptors, and environmental risk assessment across both aquatic and terrestrial systems. His research in evolutionary biology and genetics addresses fundamental questions such as the evolution of sex chromosomes, genetic resistance to stress, and the evolutionary implications of environmental pressures on aquatic organisms. His publication record includes well over 400 scientific works, with a substantial number indexed in international databases such as Web of Science – Clarivate and Scopus Elsevier. He is also an innovator in applied aquaculture, holding two patents related to guppy culture, particularly focused on the genetic control of sex ratios and breeding optimization. These contributions have both scientific and commercial relevance, effectively bridging fundamental genetics with practical aquaculture applications. Beyond research, Professor Petrescu-Mag has demonstrated a long-standing commitment to academic leadership and doctoral supervision, contributing to curriculum development, interdisciplinary teaching, and the training of new generations of researchers in the life sciences. His work frequently integrates molecular, ecological, and applied perspectives, making him particularly well suited for roles that require broad scientific vision and strong editorial judgment. His profile is further strengthened by contributions to environmental ethics, sustainable resource management, and agro-ecological systems, demonstrating his capacity to contextualize biological research within broader socio-environmental frameworks. Google Scholar metrics: Citation count - 1659 H-index - 19 https://scholar.google.com/citations?user=6We0wlIAAAAJ&hl=ro&oi=ao