The reefs are made of “Reef Balls”, perforated concrete domes specially designed to create habitat for marine organisms. Groups of about a hundred are placed around shell pads left over from oil drilling operations. Artificial reefs provide more productive fish habitat while enhancing recreational fishing. These ‘islands’ of relief on the otherwise flat, soft lake bottom attract and support a wide variety of life. They disrupt water currents and provide critical hard structure, which makes better habitat for bottom-dwelling organisms. These invertebrates form the base of the food web and support large species including sport fish.