As promised, this is Part 3 of the my series for some of the most common questions about Fishville Arena. Hope I will help to answer what you have been wanting to know.
The Arena Fishes require training.
To know if you have Arena Fishes you can simply hover your cursor over the fish of your choice. If your cursor shows a screen that displays something like this, you can be sure it is an Arena Fish. It should show the words Arena Fish at the top left hand corner, as well as the 4 statistics that you should be concerned with: Health, IQ, Agility and Strength.
You may also buy your Arena Fish from the Store. Look out for the red Arena Fish label.
To train an Arena Fish for the Arena Battle, you need to select the Arena Fish first. Once you click on it, you will see the statistics that are specific for that particular fish. You can then click on Train (green icon).
If you happen to click it in a non-Arena Tank, the abilities will be grayed out.
So you can go ahead and choose the special arena ability you want your fish to be specialised in. This is easy. You just need to click on the Add Food icon besides the particular ability (IQ, Agility or Strength).
You may want to view my other FishVille posts or surf around my blog.