Salmon Cannons

Though the strange salmon cannon has suddenly caught fire, it turns out the quick process of spitting fish through tubes to hurdle over obstacles in water has been a focus of wildlife experts for years.

While human-created dams generate useful, green energy, they disrupt a river’s natural flow, also disrupting the natural spawning runs of the indigenous salmon. Written reports of rough fishways date to 17th-century France, where bundles of branches were used to make steps in steep channels to bypass obstructions.

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