Imagine you're a river herring, maybe about a foot long, swimming merrily upstream when you suddenly hit a giant concrete wall. How do you cross it? Engineers are now designing new fishways disguised as broad, rocky pools that help migrating fish make their way through dammed up rivers.
Imagine you're a river herring, maybe about a foot long, swimming merrily upstream when you suddenly hit a giant concrete wall. How do you cross it? Engineers are now designing new fishways disguised as broad, rocky pools that help migrating fish make their way through dammed up rivers.
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