Depending on where you are in IL, RES may be ok. They occur in SD and MI and throughout NE.

PS grow smaller than RES [8" PS is considered large], have higher fecundity [can be difficult to manage populations], and also possess pharyngeal molars for crushing crustaceans, bivalves, etc. They will help manage snails/parasites like RES.

Sorry Corkman, welcome to the forum, and back to your thread! Count on Ken and CJBS - they are the VA area experts.

Many men go fishing all of their lives without knowing that it is not fish they are after. ~ Henry David Thoreau

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