Photo by: Dr. Hannes Grobe. A microphone design to record underwater called a hydrophone.

A team of biologist from the University of Massachusetts Amherst has published recordings of sounds believed to be made by deep sea fish. The recordings were made in the North Atlantic Ocean approximately 2,237 feet below the surface. It is reported that some species of fish have been found to use “sonic muscles” to create sounds in the deep. These studies are in the early stages of observation; it will be interesting to follow these
developments.

I dug up an article dating back to September 24, 2008 reporting the discovery of several specialized muscles found in cusk-eels which are believed to be used to make sounds. It is (or was) believed these sounds were used for mating calls. Read more on the cusk-eels here.

You can hear the recently released recordings here.

It is important that to note that all of these sounds are labeled as “unkown deep sea sound”. You may read the rest of the story here.