Kelp fronds and pneumatocysts. Pneumatocysts, gas-filled bladders, float the kelp off the ocean bottom toward the surface and sunlight, where the leaf-like blades and stipes of the kelp plant grow fastest.
Species: Giant kelp, Macrocystis pyrifera
Location: Catalina Island, California
Image ID: 37297
Various stony and soft corals on pristine tropical reef. Table coral competes for space on the coral reef by growing above and spreading over other coral species keeping them from receiving sunlight.
Species: Anthias, Pseudanthias
Location: Namena Marine Reserve, Namena Island, Fiji
Image ID: 31408