Fishes show a startling variety of body forms and behaviours. They range from the massive whale shark down to the smallest fishes that are adults at well under a centimetre in length. Fishes hold a fascination for many people. They are wonderful to watch underwater or keep in aquaria. Of course fishes are also of huge commercial importance. Worldwide there are over 32,000 described species of and over 4,400 from Australia. There are still many species to be discovered and much to learn.
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