海洋生物指示物种：泰国珊瑚礁上的桶海绵

barrel sponge (Xestospongia testudinaria) anchors a coral reef as yellowtail demoiselle (Neopomacentrus azysron) shelter above it, the camera orbiting this marine biodiversity hotspot in the Andaman Sea. Barrel sponges host symbiotic fungal communities, making them living bioindicators of seawater temperature used by marine researchers studying reef health. This specimen shows a fully intact, filtering structure typical of a stable reef. 4K, vertical, wide angle, orbiting camera, scuba diver POV. Andaman Sea, Krabi Province, Thailand.