I know people who have stocked TShad in ponds having an existing predator population who have done well with them and some who could not get a viable TShad population started. Tilapia could sub for TShad as LMB food assuming you have other forage as well (BG/RES/FH). I have not seen a nutritional break-down or comparison of herrings (shads , alewife and blue-back herring) vs. tilapia. The herrings are high in lipids (fish oils) and energy and thus are very good food for LMB. I have not seen a break down on tilapia. IMO that would only be a small concern to check on.