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"Salmon cannon" successor continues to give fish tube-rides over dams
Back in 2014, we heard about a so-called "fish gun" or "salmon cannon" that safely shot spawning fish up over river-blocking obstacles such as dams. Its successor has since entered use, most recently allowing herring to bypass a spillway for the first time in 80 years.
The fish were manually loaded into the bottom end of the system, where the lower air pressure inside sucked them in and up the tube. This not only allows biologists to keep track of what sort of fish are in the river, but it also lets the system "refuse entry" to undesirable species. There, it was successfully utilized to help spawning American shad and blueback herring bypass a spillway located between Lake Marion and the Santee River.
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