You'd be surprised on how creative the companies that electroshock ponds are with getting a boat into them. I saw one company put a boat in a pond to spray for weeds using an ATV.

I have tried all sorts of traps. NEVER have I had a Largemouth Bass in a trap and only 1 Smallmouth Bass. Angling or electroshocking is your best bet.

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).