EELS

An eels is any fish belonging to the order Anguilliformes which consist of four suborder ,20 families,111 genera and 800 species , and most eels are predators .
  Eels are elongated fish ,ranging in length from 5 cm (2.0 in ) , adult range in weight from 30 grams (1.1 Oz) to well over 25 kilograms .Most eels lives in the shallow water of the ocean and burrow into sands , mud, or rocks . A majority of eels species are nocturnal , thus are rarely seen.