There are folks here a lot better qualified to answer that question than I, canyoncreek. My own experience was that they would if there were nothing else to eat. Result: FHM wiped out (no hiding places) before LMB stocked, so the only LMB that really grew were aggressive cannibals. Electroshocking revealed that the rest (90 percent) of LMB didn't do much first few months.
With Walt Overton's help, did second stocking of selected smaller TP in fall 2016 so that LMB could get more to eat. From what I can tell, this has improved growth rates.
But I'll never get back the first few months.