Free: Contests & Raffles.
Years ago, my uncle caught some of those and buried them in his garden. later, you had to watch where you stepped, because the oil would spurt out of the ground where he buried them!
Called um squaw fish growing up...lots in the lower valley. There was someone paying u to catch um on the columbia river...think there are multiple stations to sign up at
http://www.pikeminnow.org/The 2014 Sport reward payment schedule is as follows: 0-100 fish: $4 per fish 101-400 fish: $5 per fish 401 and above: $8 per fish TAGGED FISH rewards are $500 per tagged fish Minimum size is 9 inches.
I believe you can register for pike minnow at Columbia Point Park in Richland. My buddy registered the other day due to the amount that we catch while we are walleye fishing.