Is there any way that you could rig up an electric trolling motor with the prop sticking part way out of the water? That would agitate the water, helping to put O2 back into it.

Or run well water into the pond.

Or aerate with a diffuser.

I don't know what resources you have available to put more O2 into there before you seine.

The wind will help a bit, but I'd feel better if you could aerate somehow.

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).