I've done it for many years when I had more time. Eventually you will produce so much that the local stores won't give you much for whatever you are raising. The cost to raise them to a marketable size is cost inhibitive. You have to raise fish for the love of it otherwise it becomes a chore that consumes your free time. The best would be make extra money by working a little overtime at work or have a business that can support your hobby. I find it more enjoyable when you are keeping fish than trying to maintain a thousand fishes that depends on you to keep them alive and sell for next to nothing after expense. Good Luck.
