• Tuesday, May 17, 2022

    write for AmsterDOCollaborate

  • Crayfish on the streets of Amsterdam

    Crayfish are appearing everywhere on the streets of Amsterdam. Why are they here and what do they want?? Not to worry, Waternet’s Bart Specken has the answers:

    ‘Every summer when young crayfish mature they want to go out and explore. They only do so just after heavy rainfall otherwise they become dehydrated.’

    Crayfish are not native to Amsterdam’s canals. Specken believes that the first crayfish were dumped in the canals by someone who bought them abroad. Waternet’s expert estimates that there are some hundred thousand crayfish in the canals. ‘But estimate is very cautious, their numbers are hard to measure so there could be as many as 1 million.’

    Several years ago Waternet was worried about the crayfish becoming a pest because of their sheer numbers but those fears seem unfounded. Specken: ‘When a species is new to an area, other animals don’t know what to do about it. Since then herrons in Amsterdam have discovered that crayfish are an easy prey.’

    Speck reserves judgement as to whether or not these crayfish can be enjoyed by humans as a light lunch. ‘We don’t provide such information, but it is common knowledge that crayfish are often eaten.’

    In any case, this guy doesn’t seem to happy about being approached;

    Image: Peter van Abbe (AT5)


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