Chiller for 1gph flow for hatching trout eggs

In my niche market I've hatched and grown out every species I raise and sell except I haven't hatched any trout yet. This fall I will have plenty of potential broodstock brook trout to take eggs and milt from and think I'll give it a go as an experiment. The spawning part is a no brainer for me as I've done it in college and have observed state people doing it. However I'd like to get your opinions on the three alternatives below.

For the few hundred fry i need I won't need more than 1 gpm of flow but I'd like to use less than that if possible to keep from running the well nonstop. I've become really proficient in in recirculating systems. I can keep the water at 62 F. with no cooling needed over the winter in my basemen,t which is fine for the grow out of trout, but it probably should be a little cooler for egg incubation. I figure my options are:

1.) Supply water to the eggs via the RAS but with some additional well flow to keep temps down in the 50's. for incubation of the eggs. (Well water temp is 51.6. F. )

2.) Use 100 percent RAS water but add a small chiller to keep temps down.

3.) Pipe in some flow from a pond close the basement in addition to the RAS to provide cooling but run it through a ultraviolet sterilizer before it it reaches the eggs. I could easily control temps via a valve and gravity flow. (The trout pond is only 20 feet from the basement and the eggs would be lower than the pond for gravity flow.

Thoughts?

Why would the UV sterilizer be necessary?

Possible parasites and other pathogens coming in from the trout pond.

Can you run tubing outside the basement, pump RV antifreeze through the line, and put a few coils of the tubing in the tank. This tubing would be a closed system. This could work well seasonally.

First of all my post title should say gpm instead of gph.

Hmmm... that's an idea. However if the water is too cold the nitrifiying bacteria will not work well will it?

It will slow it down for sure, just oversize the filter. Also with a thermostat, and a solenoid you could divert the flow, and keep a constant temp.

I have had a garage tank with oversized filtration heavily stocked do just fine and it often got into the low 40's

Edited by Skipjack, 18 June 2012 - 10:17 PM.