A Blue Chromis (Chromis cyanea) swims into the current to maintain station over a colorful reef in the Atlantic Ocean off the coast of Key Largo, Florida.

atlantic ocean blue chromis chromis cyanea florida florida keys florida keys national marine sanctuary key largo animal themes animals in the wild aquatic blue chromis close up color image colorful coral coral reef electric blue fern fin fish fish scales nature no people one animal outdoors photography reef sea sea life shallow side view small species swimming tropical climate tropical fish undersea underwater vertical wildlife