Results for subject term "RCD Rotary Screw on Napa River": 1
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One Fish, Two Fish: Counting Salmon & Steelhead at the Rotary Screw Trap
Over 30 species of native and non-native fish have been observed in the Napa River through the use of a rotary screw trap. It can be tricky to track fish in the river; some species, like Steelhead, swim up the river to spawn at night or when theā¦