The US Army Corps of Engineers and environmental groups have been engaged in a pitched battle over how to protect endangered US Pacific Coast salmon. The Corps and the US National Marine Fisheries Service authority to operate the dams and fisheries is constantly challenged in court, generally ruling against these governmental agencies due to lack of information regarding fish counts. An article in last weeks Oregonian provides details about a program that relies on embedded RFID tags and hydrophones positioned at the mouth of the Columbia River to more precisely estimate the population of migrating salmon.
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