I live in Seattle, WA and I have my ebb and flow system in a greenhouse with a 300 gallon rubbermade tank. I just can't decide what the best type of fish would be. My options and I see them are:
Trout: Relatively inexpensive and easy to get in my state, however I would have to stock them annually.
Channel Catfish: Also relatively inexpensive and should be able to tolerate large swings in temperature however I know they do better at higher temperatures and I don't think I can easily keep my water over 75 degrees for long periods of time.
Tilapia: This would be my preference due to the fact that they reproduce so well. Again I am concerned that I can't keep my water warm enough (even if I keep them indoors for the winter). There are no sources of Tilapia within the State of WA.

I am hoping for someone from the state of WA or a similar climate who can share their experiences good or bad. Thanks