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. They inhabit shallow coastal waters throughout the world.
Most eels have no scales and are protected by a layer of slippery mucus.
Their dorsal and anal fins, which run from close to the head to the often nonexistent tail fin, provide much of the thrust for these lithe swimmers. Most species are less than one meter long. One contger eel, however, is known to grow up to three meters long and is found as deep as 250 meters in the ocean. The climate of the ocean does not vary much throughout the seasonal changes. It does not change because water does not heat up or cool down quickly.