It might be easier to just lower the pond level, deepen the shallow part, siphon or pump water from the wet, old deep part to the new, dry deep part, and move any fish by bucket. Cutting a trench is going to be a PITA, and the flood of water through the channel will stir up a load of sediment.
I've done something similar, siphoning down a small 1/8 acre pond, fishing the hell out of it and transferring LMB/BG by hand to another pond, then siphoning it dry and collecting any last fish by hand. If you have an open day or so, it's actually a really neat exercise, and a great opportunity to get rid of carp or bullhead.
One thing to consider: now matter how you choose to do it, this will be stressful for your fish, and your forage base may well get depleted. You might want to do this once water temps are a little lower, and throw a few pounds of GSH or something in the newly filled area to give the LMB something to munch on for a while.
Last edited by txelen; 07/14/10 11:33 PM.
