20 seconds after the fish were released, time for them to sweep through

the turbines and into the tailrace.
The balloons bobbed the fish to the surface so that they could be easily
retrieved by the researchers. Each radio-tagged fish had its own
frequency so researchers could determine when and where they were
released into the turbines.
Video cameras down in the turbines verified that the fish were
delivered, by special pipes, to the three separate points on the
Analysis of the results showed that that fish passing through the MGR
turbine had half

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