Flush them with salty water. It makes them clean all that mud out of their system. The only ones I've had were from the gross old battle down by hardisty wainwright. Because of the laws we caught a bunch and boiled them right away and they were gross because of the "mud vein". Next time we put them in salty water that killed them slowly and made them clean out them selves. We were camped by myrNam that time. I don't think they would be any good killed as soon as they are caught then boiled. Maybe we did something wrong but I know you sure don't wanna get caught with live ones for what you get in return. It's a metallic, sloughy, taste. We did the butter and hot sauce dip and cooked em proper but still tasted like the river smeled.
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