It is the castellanization of the term Muraenidae. It is the name of a family of marine eeliform fish. They are known as brunettes, congers or eels. They have cylindrical bodies (similar to that of snakes) and are very voracious.
Murénidos : Family of physostomos fish, long body and cylindrical, naked or with small rudimentary scales, without abdominal aayahs and long dorsal.