90 degree Temp In my Pond - The Planted Tank Forum
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post #1 of 12 (permalink) Old 07-26-2016, 08:18 PM Thread Starter
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90 degree Temp In my Pond

Is this too high for fish? I have danios and white clouds and cherry barbs.
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post #2 of 12 (permalink) Old 07-26-2016, 08:23 PM
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Hell yes . With out a ton of aeration and surface agitation your oxygen level will be close to zero
post #3 of 12 (permalink) Old 07-26-2016, 08:43 PM Thread Starter
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Its a 400 gallon pond with waterfall but I've lost fish every summer so I guess its the heat. We have 98 deg temp for many weeks in summer. It gets afternoon sun so it really heats up. Maybe I should make some cover.

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post #4 of 12 (permalink) Old 07-26-2016, 11:03 PM
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Those white clouds are probably particularly unhappy as they are a cooler water fish to begin with.

As for keeping the temperature down, shading the pond either with a canopy, floating plants or a tree will probably help some as well


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post #5 of 12 (permalink) Old 07-26-2016, 11:11 PM
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The waterfall you mentioned would definitely help with surface agitation. Being an outdoor pond, there is likely some breeze blowing across the water so that does help with evaporative cooling. Unfortunately as others have mentioned, the sun will do what it does and keep your pond a little too warm. A 400 gallon pond does not sound huge - would it be possible to build some type of shade canopy over the pond? A good friend of mine has a pond (size unknown) and he has a very nice wood pergola over his pond. He says it does help cut down on direct sunlight. As for the 90 degree water, I did find some research regarding maximum oxygen levels in various temperatures of water. Surprisingly 90 degree water "can" still hold a sufficient amount of oxygen for fish. Do the fish like it that warm, now that is a different issue.


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post #6 of 12 (permalink) Old 07-27-2016, 06:44 PM Thread Starter
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The waterfall you mentioned would definitely help with surface agitation. Being an outdoor pond, there is likely some breeze blowing across the water so that does help with evaporative cooling. Unfortunately as others have mentioned, the sun will do what it does and keep your pond a little too warm. A 400 gallon pond does not sound huge - would it be possible to build some type of shade canopy over the pond? A good friend of mine has a pond (size unknown) and he has a very nice wood pergola over his pond. He says it does help cut down on direct sunlight. As for the 90 degree water, I did find some research regarding maximum oxygen levels in various temperatures of water. Surprisingly 90 degree water "can" still hold a sufficient amount of oxygen for fish. Do the fish like it that warm, now that is a different issue.
the sun helps in winter and I rarely lose fish even in 30 degree temps. Fish breed like crazy year round. But I see some floaters when it gets this hot. Down at the bottom is cooler. They do not eat and stay low.
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post #7 of 12 (permalink) Old 07-27-2016, 07:05 PM
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You might want to plant shade bush & trees.
Or grow lilies, hyacinth in the pond for cover.

For now, you can throw an insulating, reflective cover over the pond in the afternoon.


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post #8 of 12 (permalink) Old 08-12-2016, 07:17 PM
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You seriously need some shade. We've had it much hotter here. We just got done with 12 days in a row over 100. It was in the mid to high 90's all week. I don't think it's been in the 80's since June. Right now my pond is at 69.8 deg. And that's with a large above ground filter that catches a lot of sun.
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post #9 of 12 (permalink) Old 08-16-2016, 06:13 AM Thread Starter
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I never checked the temp before. It has been years running in the sun. I decided to check it during the heat wave. Now I am concerned and will be building a shade structure of some sort. I purchased an umbrella for quick cover and the temperature has dropped to 80 degrees.
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post #10 of 12 (permalink) Old 08-16-2016, 06:48 PM
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Do you guys know if it's too hot, it could kill the beneficial bacteria in the filter? My niece's pond recently had an ammonia spike.


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post #11 of 12 (permalink) Old 08-18-2016, 03:39 PM
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Do you guys know if it's too hot, it could kill the beneficial bacteria in the filter? My niece's pond recently had an ammonia spike.


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Yes it can, its caused by the lower oxygen levels.
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post #12 of 12 (permalink) Old 08-18-2016, 07:57 PM
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Yes it can, its caused by the lower oxygen levels.
Oh yeah. That is most likely the cause.

Besides O2, do you know the temperature limit?


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