在墨西哥海湾花园堤岸国家海洋保护区，用钢柱支撑着一个气体平台，构成了垂直的镶嵌着管状绵礁的暗礁。
In the Flower Garden Banks National Marine Sanctuary in the Gulf of Mexico, steel pillars supporting a gas platform make a vertical reef encrusted with tube sponges.
黑鳍礁鲨虽然广泛分布于太平洋，但似乎只是生活在其周围很小范围内的暗礁群。
Blacktip reef sharks (Carcharhinus melanopterus), although widespread around the Pacific, appear to have small ranges within their home reef system.
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