As many females as he can lock with. Just as long as he gets his time in and time out with the girls to rest up. And as long as he doesn't lose too much weight. Some males go off feed as long as they're near scaly ladies. Others never miss a meal. Luck o' the draw. I plan on eventually having 2 males and 4 females. I'm pretty sure that's a safe ratio to ensure lots of locking opportunities throughout the season. So much patience required.