Google parachute skimmer.

Be careful of getting something too wide. It's better to make two passes with a smaller one than make one pass with a big one that needs a tractor to move it at the end of the pass.....

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).