TOM MCHUGH / SCIENCE PHOTO LIBRARY TOM MCHUGH / SCIENCE PHOTO LIBRARY
Arawana fry. View of several arawana (or arowana, Osteoglossum bicirrhosum) fry with their yolk sacs (orange) prominent. The yolk sacs are remnants from their eggs, and are intended to provide nutrition for the young until they can catch their own food. Arawanas live in the freshwater rivers of the Amazon basin, and feed on shrimps and other fish. They prefer to stay close to the banks of rivers, under cover of plants, and spend most of their time near the water surface. Fully grown arawanas may reach a length of 60 centimetres. The arawana is a popular aquarium fish, although they rarely attain their natural size in captivity.
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