(Abstract translated with Google Translate) This study aims to assess the region's sponge fauna and the presence of diseased individuals through underwater observations and sampling conducted along the coast of Bozcaada between 2020 and 2023. A total of 28 sponge species were identified through SCUBA diving. Five of these (Axinella cannabina, A. damicornis, A. polypoides, Aplysina aerophoba, and Tethya aurantium) are protected by international agreements. During the study, significant tissue necrosis was observed in individuals of Sarcotragus foetidus, S. spinosulus, and Aplysina aerophoba. These findings indicate the increasing susceptibility of sponge populations to environmental stressors and the spread of sponge diseases in the region. Potential causes of sponge diseases include rising seawater temperatures, inadequate wastewater treatment, coastal pollution, and habitat degradation. The findings demonstrate that the Bozcaada coast is an important region in terms of both biodiversity and conservation priorities, and point to the need for more comprehensive and interdisciplinary studies to monitor sponge health.