Fish have a reputation for being gormless and forgetful, but they can "count", navigate a maze and even remember faces There is something fishy about our attitude to fish. It is estimated there are a staggering 250,000 species of fish in our oceans, yet despite their diverse looks and behaviour, many people perceive them to be universally dim-witted. This widely-held belief may persist due to an unconscious bias, based on an old-fashioned view of how evolution works. Culum Brown of Macquarie University in Australia, who is also assistant editor of the Journal of Fish Biology, suspects that many people underestimate how smart fish are because they assume fish are primitive creatures.

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