Age Structure, Sexual Dimorphism, and Ontogenetic Melanism in a Captive Population of the Endangered Freshwater Turtle <i>Mauremys reevesii</i> (Gray 1831)

was significantly influenced by age rather than body size. These findings provide the first detailed age-based dataset on growth and melanism in this critically endangered species. This study offers a scientific basis for more accurate population assessments and the development of targeted conservation strategies, while helping to bridge the gap between wild and captive populations.