Honestly, I would just say no. I know it's not what you want to hear but Even brook trout, the state record is almost 8 lbs, which is subjected to the winter season when it's not going to be eating as much. In captivity it could get even bigger. If you get anywheres near that it's going to be 20 some inches long full grown, and extremely fat. Just for one fish, it would need Lots and lots of food and I would imagine be difficult to have unless you had it in a very large aquarium. Just for reference, try and go to a local fish hatchery and see what size container they have these fish in. Anything bigger than a brookie, forget about it. Same for bass. If it's going to be in a heated aquarium where it feeds year round substantially, it could get well over 10 lbs. Not to mention it needs lots of room to swim. Imagine an excited 15 lb largemouth swimming head on into the side of a tank, Unless it was heavily reinforced it could cause major problems. Just my two cents.