珊瑚礁海藻：海龟草状巨藻丝状体附着在珊瑚碎屑基质上

Weed (Chlorodesmis fastigiata) is a bright green, hair-like marine macroalgae, typically growing in dense, grass-like tufts on sandy or coral rubble substrates in underwater reef environments. Isolated tufts like this are normal on a healthy reef, but dense blankets of the same species signal nutrient pollution from agricultural runoff, sewage or coastal development driving harmful algal overgrowth. This single contained patch shows no sign of that wider bloom condition. 4K, wide angle, horizontal, close up, scuba diver POV. Andaman Sea, Krabi Province, Thailand.