Fish move during low light hours which includes cloudy days. But in the main stem Columbia below Portland tides have more effect.Hmmm...
Different approach I guess.
That would be beneficial. But, don’t most Gish move at night?
Also, coffee dams to direct fish would also need to be placed.
Ever wonder why all those skeletal piling jutting out into the Columbia??
All of those skeletal piling in the Columbia are old docks from fish processing operations from the days when they used horse drawn seines at the mouth of the Columbia on the bars at the mouth of the river and gill nets from the main river. The outer bars they used to fish disappeared once they started dredging the river for navigation.