Fish choir
Media playback is unsupported on your device
Video

Amazon electric fish 'make music'

Electric fish from South America are opening up new ideas in robotics. Ghost knifefish, as they are known, put a small current through the water to sense their environment, and undulate a long fin to move around.

Northwestern University, US, scientists believe both features could be harnessed in a new class of autonomous underwater vehicles.

They have also had some fun with the fish by putting them in a "choir".

Every fish produces a constant electric field and every species emits at a different frequency. So, by converting these frequencies to a sound, it is possible to make some knifefish music.

The knifefish choir is an art installation based on 12 fish tanks. Listen to the sounds it makes.

Go to next video: Termites inspire robot builders