OK, I thought you might have so much water going in and then also going out which would create a slightly different situation. If that was the case, you might be able to maintain slightly cooler water during the summers thus facilitating a Smallmouth/Yellow Perch gig.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."