Thanks for the replies.

I understand the pro's & con's of the species (perca flavescens); and we've taken steps in the design of the system to minimize the negatives and (hopefully) capitalize on the positives. We're starting out (relatively) small but it's a "commercial" venture, so if I do screw up there will be a lot more than 12 dead fish... thousands potentially.

Obviously we have some back-up systems and a good water supply; but there are countless things that can go wrong especially at (again, relatively) high stocking densities.

On a happier note, we do expect them to reach "market size" in less than a year without trying to mate, so that's a plus.

I appreciate the help; I'm just not sure how much info I can share.