Theo provides some good alternatives to BG and seasonally added trout. Choose trout that are optimum size as forage for the larger sized LMB. YP may have a hard time maintaining breeders in your pond with large bass.
If you want to also provide a warm water seasonal fish for growing big bass consider tilapia. Tilapia besides adding lots of extra forage fish, will provide summer long natural filamentous algae control. Just about every pond has issues with filamentous algae during summer. Herbicides often have non-targeted results of inhibiting the lower part of the food web. Check with Rainman (member #3530,
http://www.TilapiaStockers.com on this forum about potential deliveries of tilapia to your area.
Depending on the type of LMB you currently have, consider nudging your LMB population toward a more pellet (3/4" nugget, Aquamax largemouth) eating fishery. Selectively remove existing LMB and replace them with pellet trained young adult bass (8"-12"). The new Aquamax largemouth pelleted food feeding program has been producing good results of growing big bass relatively quickly where ever it is used correctly. You can read about it on this forum by using the search feature. The Pond Boss magazine has also had several stories about success of the Aquamax Largemouth feed.
