By far the best way to grow aquatic animals in your backyard, like fish, mussles, yabbies, and other fresh water crayfish, is to use an aquaponic system.

If you've not heard of aquaponics before please visit the backyard aquaponics website or forum.

BYAP site
www.backyardaquaponics.com

BYAP forum
www.backyardaquaponics.com/forum

Aquaponics is the most efficient way of growing a fish crop because it combines plant crops within the system as well to filter the water.