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.
15 Feb 2014