FishVille Battle Arena (?) appears and then disappears again

FishVille is apparently in the process of rolling out a new features for the game, called the Battle Arena, and some players had the chance to test out this new mode in the game for a brief period of time.

From what we can tell, the Battle Arena involve buying a battle fish and then training it by -- from what we can tell -- feeding them special Training Foods. It also sounds like players will need to set aside a tank for battling, and there will be special 'battle' decor as well.

Know anything about FishVille Battle Arenas or have any pictures of them? Please send them to libe@games.com, and we will post them here.