I'm with Brettski. I like to put the wire inside conduit as well - a little bit of extra protection in case some digging is done around the wire in the future. Like BGK said, size of wire depends on motor draw and length of run. Make sure any boxes you use are outdoor rated, and use a GFI.

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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).