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EW, Thanks for the explanation on alkalinity and stress. I guess it's time for me to check my alkalinity again.

Playsomehonk, I'm sorry for your turnover event. I'm heading to my pond in Pearl River County tomorrow and I haven't been there since the mid-week storms and hoping I don't see anything like you've seen. Good luck in your recovery!


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Best of luck DJ. I asked some folks in my area who have ponds and no one else had or knew of another kill.

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Post kill update: As folks who have experienced a kill told me, it usually looks worse than it is and I hope that's the case with mine. The BG stopped on feed for 2-4 days but are back on feed aggressively as of yesterday.

If most of the fish that died floated and were visible, I estimate I lost 4-500 CNBG/RES and less than a hundred bass so definitely not a death blow just a solid punch in the eye)). Most bream and bass were larger size and very few small fish were killed. Threadfin took a big hit but I don't know what percentage died.

I told Management company about my hay fields being fertilized and they said that the high N2 could have contributed to the plankton kill...but I'm not sure how? Maybe burned it? Recommended that we seek a ~24" reading leading up to fertilization of hay field fertilizing next year. I had a16-18" reading this year around time fields were fertilized in April.

You guys are full of knowledge and experience and my thanks to all for taking time to provide the excellent input. I've rescheduled my electro survey for later this month and will update findings then to close the loop. Now I will be reading up on aeration systems thread.

Ronnie

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It doesn't have to be a turnover. In an 18 ac "pond" that has a max depth of 8' that I used to manage, they had both summer and winter kills. The HOA didn't have a large enough budget to allow installing an aeration system in the whole pond, so we did 1/2 of it. The next year they experienced a summer kill in the half of the pond that was not aerated........ Visibility was around 18" at the time, and this is the year following a summerkill then a winterkill.

So to me, aerating even a relatively shallow pond will help minimize fish kills due to low O2 events.


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My BOW has a standpipe system, 9 5/8 inches, that takes water off the bottom near the dam (about 25 feet deep). Most of the year the water runs out the pipe 5 - 15 gallons a minute due to a couple of small creeks, though during prolonged dry spells the flow stops (creeks still flow a little, but not enough to keep up with evaporation).

During large rain events, such as we've had the last week, water gushes out the pipe. Fortunately, only once did the emergency spillway come in use a couple of years ago.

Here's my question: To what extent does taking water from the low DO bottom layer help protect against fish kills? Does it make any difference at all? I know it's better to keep high O2 & fertile top water in general, but never heard any discussion about relationship to turnovers & fish kills.

Any thoughts?

Last edited by anthropic; 06/04/17 02:11 AM.

7ac 2015 CNBG RES FHM 2016 TP FLMB 2017 NLMB GSH L 2018 TP & 70 HSB PK 2019 TP RBT 2020 TFS TP 25 HSB 250 F1,L,RBT -206 2021 TFS TP GSH L,-312 2022 GSH TP CR TFS RBT -234, 2023 BG TP TFS NLMB, -160




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Your system improves water quality. It helps reduce turnover but does not stop them. Turnover is mostly temp related. When turnover occurs rapidly if the deeper water is poor quality (low DO) fish kills may occur. Proper aeration makes the entire water column sufficient for DO purposes.
















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Thanks. That's what I thought, but needed some confirmation by people who know a lot more.

Even though pretty new, my BOW not only stratifies, the bottom layer can become nasty. A year ago the water coming out the standpipe smelled like rotten eggs for a few weeks. This was during a prolonged hot & dry spell.

Will have to aerate at some point. I have an 80 yard (not feet) long island in the middle, which obviously reduces natural wind driven oxygen exchange, something Bob Lusk pointed out several years ago. Haven't done so due to lack of electricity and extra $ to pay for system, but now that the fish are growing and the pond has become more fertile I'm gonna have to bite the bullet.

Last edited by anthropic; 06/04/17 02:17 PM.

7ac 2015 CNBG RES FHM 2016 TP FLMB 2017 NLMB GSH L 2018 TP & 70 HSB PK 2019 TP RBT 2020 TFS TP 25 HSB 250 F1,L,RBT -206 2021 TFS TP GSH L,-312 2022 GSH TP CR TFS RBT -234, 2023 BG TP TFS NLMB, -160




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The smell you noticed is common. I would not worry about that one factor. One way to help some is in winter drop the water level just before a big rain event. Another help would be to keep the alkalinity up if possible.
















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anthropic, read this article. Hydrogen Sulfide While it is aimed at aquaculture, it is also related to your pond. While a turnover reduces the amount of dissolved O2 in a pond, it also mixes Hydrogen Sulfide and small amounts are toxic to fish. That's why there is a slow start-up with aeration systems in ponds that are stratified.


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