This delicious CRUSTACEAN is America's favorite SHELLFISH. Most of the shrimp in the United States comes from bordering waters, notably the Atlantic and Pacific Oceans and the Gulf Coast. There are hundreds of shrimp species, most of which can be divided into two broad classifications-warm-water shrimp and cold-water shrimp. As a broad and general rule, the colder the water, the smaller and more succulent the shrimp. Shrimp come in all manner of colors including reddish- to light brown, pink, deep red, grayish-white, yellow, gray-green and dark green. Some have color striations or mottling on their shells. Because of a heat-caused chemical change, most shrimp shells change color (such as from pale pink to bright red or from red to black) when cooked.