rotary trap for fish
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A rotary screw trap monitors fish populations in a canal that empties into the Columbia River at the Ringold Dam, Washington, USA Royalty Free Stock Photo
A rotary screw trap on the Middle Fork of the Willamette River near the Dexter Dam in Oregon, USA Royalty Free Stock Photo
   
   
   
   
   
Rotary Trap for Fish
   
   
   
   
   
   
   
Rotary Trap Device Used by United States Washington Fish and Wildlife Department Along River to Catch and Release Downstream Outmigrants Fishes for Research at Cedar Creek

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