Most affodable way to cool a small pond for trout.

[Dieselhybrid]

Makes sense, same reason you have to vent portable AC units.

Deeper and shade trees with waterfalls sounds like the key OP

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[jonny5]

you will spend a lot of money if you try to cool an outside pond in summer. best bet is, place pond on north side of your property, place pond in shade (might not be as appealing to you but will keep algae and temp down), have a waterfall to increase evaporative cooling, and make it deep, that way the water on the bottom can stay cool for them.

Other than those things you are going to be using electricity somehow.

Some trout are more tolerant of warmer temperatures as well, like brown trout and brookies, maybe you could get some. Rainbows still work fine if you can keep that temp below 70F

 

[MN_Rebel]

you will spend a lot of money if you try to cool an outside pond in summer. best bet is, place pond on north side of your property, place pond in shade (might not be as appealing to you but will keep algae and temp down), have a waterfall to increase evaporative cooling, and make it deep, that way the water on the bottom can stay cool for them.

Other than those things you are going to be using electricity somehow.

Some trout are more tolerant of warmer temperatures as well, like brown trout and brookies, maybe you could get some. Rainbows still work fine if you can keep that temp below 70F

Brookies are not tolerant of warm temperatures. And brown trout are fiercely territorial towards to other trout.

 

[jonny5]

Brookies are not tolerant of warm temperatures. And brown trout are fiercely territorial towards to other trout.

really? from what I read online the brook trout is the most tolerant of temperatures, especially considering they are from the north/central eastern united stats with water temperatures averaging 5 degrees warmer than the western united states, due to less snow pack and more influence from summer warmth.

 

[MN_Rebel]

really? from what I read online the brook trout is the most tolerant of temperatures, especially considering they are from the north/central eastern united stats with water temperatures averaging 5 degrees warmer than the western united states, due to less snow pack and more influence from summer warmth.

Clearly, brookies are not that tolerant. In fact they are disappearing from their native creeks when the creeks got too warm to the point that only browns and stocked rainbow trout existed.

 

[jonny5]

Clearly, brookies are not that tolerant. In fact they are disappearing from their native creeks when the creeks got too warm to the point that only browns and stocked rainbow trout existed.

Im not well informed on the subject or anything and I have no doubt that the farm raised/stocked rainbow trout are more tolerant than their wild brethren, but water from the rockies and sierras is colder (especially during the late summer/early fall) than from the Appalachians. Logic would make me think brookies are more tolerant of heat, and I found one thing on google saying they can take some periods of time into the upper 60's, but then again location does not always dictate environmental tolerance to a specific degree. Take guppies for instance, a truly tropical fish that can handle 60F water.

 

[coyotethug]

Your best bet here is an evaporative cooler. This is the way they cool big buildings, oil refineries, and other facilities that could not be feasibly cooled with typical ac units. Basically you run pond water through piping that will transfer heat well through a tower that contains circulating water sprayed over the stack of piping and blown by a high powered fan. The latent heat of evaporation needed to o evaporate the cooling water absorbs the energy from the pond water in the pipes and cools the pond. You need an engineer to look into sizing but this would work. Initial cost might be higher than a chiller but operating costs are much lower.

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