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Dwight I thought the lake did the exact same thing last year. O2 profile sure indicates plankton bloom on top (O2 rising) less O2 deep due to shading.

Last edited by ewest; 08/09/10 08:33 AM.















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Originally Posted By: ewest
Dwight I thought the lake did the exact same thing last year. O2 profile sure indicates plankton bloom on top (O2 rising) less O2 deep due to shading.


You are right about that. In fact, it happened several times last summer.


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I read on another post that bass can live to 12-15 in prime
conditions. Let see, one pound growth per year x 12 years = big bass. I wonder if Cecil has his worry beads yet?


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How will we know she's getting close to the 10# mark if she isn't caught and weighed. Or is Dwight waiting until he's sure she's over 10#?


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Originally Posted By: esshup
How will we know she's getting close to the 10# mark if she isn't caught and weighed. Or is Dwight waiting until he's sure she's over 10#?

Darlene are all in the 8.5-9.5 range depending on the time of the year. I try not to catch them, but thoroughly enjoy seeing that cavernous mouth come to the surface as I yank the jig away. cool


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The clarity continues to plummet, water temperatures are rising, and D.O. remains good.

I haven't recorded a mid-depth temperature as high as 83 degrees prior to this one.

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There were a lot of changes this week.

Mid and bottom temperatures have dropped while the surface temperature climbed a couple degrees. Clarity is climbing again. The mid range D.O. is above 100% saturation while the top and Bottom D.O. remain about as expected. (I re-calibrated and triple checked all my readings; they were duplicated each time.)

Question of the week: Why would the mid range water be super-saturated with dissolved oxygen?

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What depth does the groundwater come in and what is the temp ? Is the circulator running ? When the bloom starts to wane (clear water) the O2 at the surface will decline absent some other event (rain/wind). The mid range water because its cooler can hold more O2. The deep water may be showing the results of the bloom sinking to depth (dead plankton) using up some of the O2.
















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Originally Posted By: ewest
What depth does the groundwater come in and what is the temp ? Is the circulator running ?


Since the pond is dug into the ground water table, the ground water enters the pond at all levels top to bottom. The ground water temperature @ 10 feet is in the range 46-52 year around. The ground water temperature at 6 inches is in the mid 70s, currently.

The circulator is in summer dry dock up in the warehouse. It is only used in the winter.


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What is the GW O2 content ?
















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Originally Posted By: ewest
What is the GW O2 content ?


Since that question comes up frequently I decided to put in a test well near the pond. I am placing the well on the groundwater in-flow side of the pond. Sometime I may put one on the out-flow side and see what changes occur as the water moves through the pond.

Should be interesting, at least to you and me. crazy


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And me!!!!!!!!!!!!!!!!!!!!!!


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Originally Posted By: Dave Willis
And me!!!!!!!!!!!!!!!!!!!!!!


I figured that would get your attention! laugh


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On Bremer Pond, Part III? smile


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IMO this is one of the very best learning threads !!!!
















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I agree Ewest, but only because of Dwight's diligence. He is an impressive specimen. Good think we can talk about him like this behind his back so he doesn't get the big head.


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Dwight - a big head - no way. You must be thinking about Molly the LMB. laugh

Last edited by ewest; 08/26/10 01:56 PM.















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Originally Posted By: ewest
Dwight - a big head - no way. You must be thinking about Molly the LMB. laugh

I do by my caps at Big Head Caps . smile


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We had a week of cool weather and it really shows in this weeks readings.

The surface and mid-range temperatures have dropped significantly. The temperature drop caused several varieties of submerged plant life to die off, though the American Pond weed is still doing fine. The plant die off caused the water to lose 23 inches of clarity with 42 inches being the lowest clarity reading do far this year. Dissolved oxygen remains good and that big bump up in the mid-range disappeared in one week.

The pond is telling us that fall is just around the corner. Darlene will soon be fattening up for winter and the best lunker fishing of the year will occur during the next two months.

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"The plant die off caused the water to lose 23 inches of clarity.. "

Any change in water color ? Cool temps usually mean clearer water .
















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Originally Posted By: ewest
"The plant die off caused the water to lose 23 inches of clarity.. "

Any change in water color ? Cool temps usually mean clearer water .

The water may be slightly more brownish-green. I looked at the water under my microscope and there is suspended plant material and plenty of critters too.

"Usually" isn't always usual here. smile The unusual may be caused by the constant battle between air temperature and ground water temperature trying to control the pond water temperature. (Keeping in mind that the cooler groundwater constantly flows through the pond) These opposing forces influence the pond water temperature; a few cloudy and/or cool days give the groundwater a big advantage in cooling (this week’s rapid temperature drop). Most ponds don't have this particular dynamic or at least it is not as pronounced.

Contemplating all the ways that rapid temperature swings could affect pond organisms could keep a pondhead awake at night! crazy


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Very true ! Good cause to remind us all that every pond is unique.

Any indication that the nutrients previously used by the weeds are now going to plankton production ?


Last edited by ewest; 08/30/10 09:57 AM.















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Originally Posted By: ewest

Any indication that the nutrients previously used by the weeds are now going to plankton production ?


I believe so (the critters I mentioned).


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The pond is experiencing the lowest clarity and D.O. levels in monitoring history.

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Two thoughts. First Mother Nature is always more variable than we think. Dwight and I like to find the patterns in stuff, but all the factors involved just result in exceptions, at least occasionally. smile

Second, lowest DO ever at Dwight's pond is still darn good shape. No concern whatsoever at 6 ppm. Your pond appears to have the capacity to handle the oxygen demand from those decaying plants. Let's see what next week brings.


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