Are those legal to use anywhere? In my state, it's nets or fish wheels, plus plain old fishing line too. We are tightly regulated so as to make sure there is enough escapement for future runs of salmon.....
I don't know that I have ever heard of one for sale, but there is probably someone who builds them somewhere. I am sure there are plans on the internet also, it would take some digging to find them. The most effective ones were built and used on the Columbia River, in the PNW.
What kind of fish? What kind of current? Can a person use a modified trap built for another species, like a crab pot, lobster trap, etc?
Use two different sizes of bicycle rims, some rabbit wire, and make yourself a giant version of the crawdad trap. Not legal to use here in Oklahoma and probably not legal in most states. But I would imaging it would work since the small crawdad trap works well with minnows and small perch.
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