Kelp rockfish navigate a towering kelp forest near California's Bodega Bay. Kelp is one of the world's fastest-growing plants, with some species adding up to a foot (31 centimeters) per day.
A bright red kelp crab nestles into kelp leaves near Bodega Bay, California. Kelp forests grow mainly in cold waters and provide shelter for hundreds of marine organisms.
Giant kelp, one of the fastest growing plants in the world, uses flotation bulbs like these to grow toward the water's surface.
Sunlight filters through a maze of giant kelp near Catalina Island in California. Kelp grows only on rocky seafloor and only as deep as the sun's rays penetrate.
Columns of bright-green algae grow in the nutrient-rich waters of Canada's Queen Charlotte Islands.
Multi-colored anemones, lavender bryozoans, and other organisms cover rocks in a kelp forest near Vancouver Island in western Canada. Strong currents around the island carry nutrients into the Queen Charlotte Strait, supporting an abundance of marine wildlife there.
A tangled kelp forest fills the water column off the coast of Maine. Kelp is harvested all over the world and used in such things as foods, fertilizers, and soaps.
Kelp leaves sway in the ocean currents off Monhegan Island, Maine. Kelp grows best in cool, clear, shallow ocean waters.