What would be the duration of stay for the fish? If you can keep it cool enough and enough oxygen for a short period of time such as at a Sportsman show you'll be fine. However after a period of time you will build up nitrogen waste products and the fish will poison themselves due to a build of of ammonia. The fish give off ammonia mostly from their gills but also from feces and uneaten feed.

If you want to hold them longer than short term you would have to have a biofilter and a way to mechanically clean the suspended and settleable solids out of the pool. You also need to keep the temps between 55 and 65 F. It can be done but get's much more involved.

Also trout are sensitive to nitrates which is a byproduct of nitrification vs. other species so the system would have to be more of a partial recirculating system if there is a significant load of fish. Literature says one new exchange of fresh water equal to the tank volume per day in commercial system.

That said, if you got a biofilter going and cycled before the fish are added,and some some kind of mechanical cleaning system ,it wouldn't be too difficult with a small amount of fish if you can keep the water cool enough and there is plenty of oxygen. You may be able to get away with less water exchange with a small amount of fish.

The other alternative is complete flow through from a ground water source where aerated cold well water is added and all the metabolites and solids are flushed out.

Last edited by Cecil Baird1; 08/04/14 12:15 PM.
If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.