Effect of Light Intensity on the Abundance of Zooxanthellae on Branching Corals (Acropora sp.) at Pagang Island Waters, West Sumatra Muhammad Zikran Desnaldi ; Thamrin Thamrin ; Sofyan Husein Siregar Journal of Coastal and Ocean Sciences 2 Okt 2026 10.31258/jocos.7.2.119-125