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Discus fish feed their young by making a special food for them - a nutritious slime that they exude from their skin for the fry to eat. Shoals of tiny babies can then swarm over their parent, nibbling at its skin. After a week they are big enough to feed on small particles floating in the water and at one month they looks like their parents. But two adolescents have strayed past the lair of an electric eel. Electric eels have very poor eyesight but they can detect objects around them by using very short electric discharges as a kind of radar. The eel rises to the surface for a gulp of air then lunges for a small discus fish, stunning it with a burst of electricity. The eel grabs it but then, for some reason, releases it a moment later. The discus recovers consciousness and swims away.