The bony eared assfish species of cusk-eel found in tropical and subtropical oceans at depths of from 1,171 to 4,415 meters. It has been found as far north as Queen Charlotte Sound off British Columbia’s coast. This species can grow up to 37 centimeters.
The bony eared assfish have the smallest brain-to-body ratio of any vertebrae, contesting with lamprey and the ocean sunfish.
The bony eared assfish are soft and flabby with a light skeleton. This is most likely an adaptation to the lack of food and high pressures which make it difficult to generate muscle and bone
Info from wikipedia