礁石热带鱼群游行为：野生黄背笛鲷游动

school of yellowback fusilier (Caesio xanthonota) streams through open blue water above an Andaman Sea reef, their yellow dorsal stripes flashing in unison as the school shifts direction together. Fusiliers are mid water planktivores, feeding on zooplankton drifting through the water column, forming a reliable indicator of a healthy, food rich reef system. Schooling behaviour like this reduces predation risk while helping the group track plankton blooms. 4K, wide angle, vertical, scuba diver POV. Andaman Sea, Krabi Province, Thailand.