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How is an artificial mega dam putting Dutch ecosystems in danger?

Dutch make hole in the dyke to allow migrating fish through An artist’s impression of what the passage will look like. Illustration: DeAfsluitdijk.nl Work has started on a four year project to boost fish numbers by allowing them free passage from the Wadden Sea to the IJsselmeer lake via a gap in the Afsluitdijk, which was built as part of Dutch flood defences and completed in 1932. Migrating fish, which need both salt and fresh water to breed, are already gaining access via the sluices of the Afsluitdijk but strong currents mean that only the strongest swimmers make it to the other side.