I agree with frigginchi. I would research Aquaponics but not rush into anything. There are some good books on the subject. I know one grower that makes more on the vegetables and herbs than the fish, and uses the fish primarily for the nutrients. You can actually grow a denser crop of plants than you would conventional ground crops using the nitrates and other nutrients the fish produce. An added benefit it the plants utilize the nitrates and the water going back to the fish is lower in nitrates which is what the fish prefer.
Here's a good website:
http://www.aquaponicshq.com/The owner of the website has a good online book.
Yours truly is a mod there.
