I've trapped crawdads on the Alsea, Marys and Luckiamute and have gotten a few 8 to 9 inchers. As far as number in a trap, I've caught over 75 in one trap (box style, about 18" X 12" X 12") - it was packed about 1/2 full! I recall tossing about 1/2 of them back in to grow up a bit. Use a little tainted chicken, fish heads or liver and let is soak overnight. I generally go out about 3 times a year and keep about 60 - 80 for a nice little boil or gumbo.