All I was saying is that only tilapia get to usable size in a single season. If you want a harvest that quick, tilapia are the only choice. They get to 1.25 pounds in 4 months. Otherwise, many fish will get to usable size in 2 years, and you get all those veggies in the mean time. Once you have your system running for 2 years, you'll have fish all the time.