They can get up to about 24", possibly larger and weigh around 8 lbs, even more if they have the right conditions. They work well for crab bait, crawfish bait and if you catch them in the Columbia River you can get $$ for turning them in. Nice catch. I just took my son out for some fishing and I found him a school of bluegill to have fun with until he started catching pikeminnow. Then I had to get on board and turn it into a derby...he still won.