[Dragonrain]

One of the Fish & Wildlife departments I use to work with had something similar to what you're describing. They had I think 2 or 3 local wild species in a tank. I know bass was one of them but I don't quite remember what else. However the tank they had was huuuge....much much larger than a 30 or 75 gallon tank....like I'm talking hundreds of gallons.

Also like was already mentioned, you have to make sure it's even legal where you live to take the species you want from the wild and keep them in captivity.

 

[Dragonrain]

But bass can grow to be huge. Even if it's small when you catch it...it's going to grow, unless it dies before it finishes growing.

I'm not a bass expert by any means, but I'm from the East Coast as well and do know a bit about the local species. I did a quick google search and found some sites that recommended at least 200 gallons for a single large mouth bass, more if you are keeping more than one. For a small mouth bass it's recommended they have at least 90 gallons. According to that, 75 gallons wouldn't be large enough even for a single small mouth bass.