[AT] OT- Fish Kill

[charliehill]

I remember reading something about pond water doing a sort of inversion in 
certain temperature conditions such as a change of seasons.  The inversion 
causes a layer of oxygen depleated water that kills fish.

We have fish kills here in our rivers on still, hot summer nights because 
the oxygen level drops.

Either way an aereator would help as someone else mentioned.  Just a simple 
pump pulling water out of the pond and spraying it back in would probably do 
some good.

Charlie
----- Original Message ----- 
From: "Bob McNitt" <nysports at frontiernet.net>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Sunday, March 15, 2009 8:18 PM
Subject: Re: [AT] OT- Fish Kill


> Warren -
>
> Having worked with fisheries pros over the years in my outdoor editor
> capacity, I'd guess the abundance of dying vegetation depleted the 
> dissolved
> oxygen, and because the density of sunfish was so high, many just
> suffocated.
> Bob in CNY
>
> ----- Original Message ----- 
> From: "Mogrits" <mogrits at gmail.com>
> To: "Antique tractor email discussion group" 
> <at at lists.antique-tractor.com>
> Sent: Sunday, March 15, 2009 6:38 PM
> Subject: Re: [AT] OT- Fish Kill
>
>
>> The "blue dye" John Hall mentions is copper sulfate and we've used it
>> in the past to kill vegetation in the summer months. The pond never
>> freezes over hard in winter but it did freeze a couple times this
>> winter.
>>
>> I've googled and the verdict for winter fish kills is decaying
>> vegetation. Nothing to be done about it really, unless I did some
>> emergency aeration with pumps and diffusers. It fits the bill- there
>> is a lot of grass decaying right now that's never been there before.
>>
>> We use no pesticides or fertilizers that could come into play here- I
>> hesitate to even use roundup nearby if there's any threat of rain.
>>
>> Luckily, the kill seems to be the smaller bluegill and no largemouth
>> bass. We are overpopulated with bluegill anyway and they are stunting
>> the bass. Besides smelling bad for a few days the biggest downside is
>> keeping my yellow lab from retrieving the rancid carcasses and
>> bringing them to the doorstep.
>>
>> On the plus side, if the snapping turtles do their job this could be a
>> big summer for turtle stew.
>>
>> Warren
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