Many fish have adapted in special ways for self-defense. For example cuttlefish have different colored pigments and rapidly changing colors to escape predators. Many sea animals find shelter among the seaweeds, in rocky crevices, or under the sand. Matching the colors and even textures of the background also helps sea creatures remain undetected. A fish designed to blend into the coral.
Hard shells are useful protection, at least from weak-jawed creatures.
Many fish have special tactics for defending themselves from predators or attacking prey. Some produce venom to defend themselves and often advertise their danger with distinctive markings. To make the most of the vast expanses of water, some sea animals travel great distances, criss-crossing the ocean to find the best place to feed and breed. Humpback Whale Eel, elongated serpent like fish of the eel order, have nearly 600 diverse species. These species, including the conger eel and moray, are grouped into about 20 families.