Have not heard of such a law. Some lakes are naturally reproducing lakes. There are also some that were stocked became naturally reproducing and died off for whatever reason. Members can sponsor those lakes that they feel want to be stocked and with the ok from the WDFW biologist are allowed to be. Most stocking is done with CT, RB, Goldens, and some Tripods. Brookies are no longer stocked because of the way they reproduce and over run a lake.