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NFC: Collection Deaths

Hey Everyone.
This has happened to me a few times before:

I empty out the minnow trap, put the fish in the jar, and bring them
back.  I set the jar in the tank, top above the water line, and the fish

I have two theories on this:  
ONe is that the DO2 in the water plummets and that kills everything. 
The streams relatively turbid, and I typically take the water from the
very edge.... 
Two is that the temperature change is just too quick and too broad a
range, even though the change by heat moving from outside teh jar to
inside it is pretty slow. 

The last collection to survive complete was a jar set on the desk for a
bit too long, by accident.  This supports the temperature thing, BUT the
water was taken from farther out.  I was on another log and could dip
from deeper water where there was more velocity and higher flow, i.e.,
more DO and less junk in the water.  

Any opinions on this?  
Joshua L. Wiegert
NFC Lists Administrator                          Wiegerj at paulsmiths_edu
www.geocities.com/RainForest/Jungle/1680/        owner-nfc at actwin_com
ICQ 69551951                                     AIM UID: Etheosoma
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