D-C, I'm guessing here, but I would think that you wouldn't want all (or even a great percentage) of the new LMB frye to survive only because you might then have an instant overcrowding issue.

I would also guess to agree with you that if you kept your Bluegill well feed, that they might not eat as many LMB frye. However, I'm not sure there's an accurate formula to know when you're feeding too much vs. not enough to prevent LMB frye predation.

No matter what, I would think you would get some LMB recruitment provided that they do indeed spawn.

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."