Golden gorgonian on underwater rocky reef, amid kelp forest, Catalina Island. The golden gorgonian is a filter-feeding temperate colonial species that lives on the rocky bottom at depths between 50 to 200 feet deep. Each individual polyp is a distinct animal, together they secrete calcium that forms the structure of the colony. Gorgonians are oriented at right angles to prevailing water currents to capture plankton drifting by. California, USA, natural history stock photograph, photo id 37156