Re: NANFA-- Temps
Sat, 25 Oct 2003 11:04:08 EDT

I believe there are at least two factors at work here. First, is the fish can
withstand a certain amount of stress, but if the stress exceeds their
capacity to rebound they suffer. Cold temperatures are another stress factor on top
of any others, like pollution, low oxygen, etc. Second, in any pond that is
below ground and a few feet deep, the lower levels are considerably cooler than
the surface temperatures -- even as low as 55 degrees in some cases. Next
summer I will do some temperature profiles in my deepest pool - 30 inches. The
other related factor is that there is an equalization or turnover phenomenon in
the fall when the surface temperature drops to the ground or deepwater
temperature. At that point, in deeper lakes, the low oxygen content deep water rises
and the fish get stressed and will not feed. The same may be true, to a lesser
extent, in a small pond.

Lee Harper
Media, PA
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