Its name is derived from the Greek chlaros, which means alive, lively, given the ability of these fish to remain alive outside the water for a long time.
They are opaque black, can weigh up to 60 kilograms and measure more than a meter long, have a long dorsal fin, dull bulging eyes and four pairs of whiskers in the mouth. You can crawl three days out of the water (using vigorously shake your tail) in search of food. Like any animal, when it lives outside of the farms or of the reservoirs where its diet is guaranteed, it can look for other feeding alternatives, and in this case, using its pectoral fins it can move on land looking for better conditions in another place.
It has a cylindrical body, solid and without scales, thin in the belly and compressed laterally.
It is a predator, with the disadvantage that it is almost blind, detects its prey by smell and whiskers and is a night hunter, so it prefers to locate its food near the bottom.