Ponds around here have the same amount of nutrients in them, but only 1/2 the volume of water.

That leads to some interesting changes from last year to this year!

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).