new fish stock this year?

There is quite a few crawfish on the east side of Rattlesnake Island, but I do not know what normal used to be. We put out a minnow trap a couple of times and caught them. Never caught a single minnow, too many bass? Just crawfish and a chipmunk (On the land that is. For some reason the chipmunk was carting around a dead mouse. How curious. We saw it come back for the mouse after his release.) Next year I guess we should release them instead of taking them fishing. The minnows, not the chipmunk. (Getting the chipmunk to stay put while hooking it is tricky.)
According to posts last year the lower population is due to the phosphorus. Can the levels ever be righted?