Fish of the day: The bony-eared assfish

The bony-eared assfish holds the record for the smallest brain-to-body weight ratio of all vertebrates. Like many other creatures that dwell in the depths of the sea, the bodies of assfish are soft and flabby, and their skeletons are light and reduced. This is likely to have resulted from a lack of food and the high pressures which accompany living at such a depth, making it difficult to generate muscle and bone