The last NZ Hunter magazine had a good article about feeding ponds and a few different approaches to doing it. I made a couple of feeders last year
I made my own NOSLOC feeder nozzle out of some medium tensile wire. works mint. also tried a maize silage feeder. cut the bottom out of a bucket and put some 75mm x 75mm reinforcing mesh in the bottom. packed the maize silage in tight and the ducks feed through the mesh. Hung both bucket feeders on steel posts around the edge of the pond.
The other thing highly over looked is duck predators (rats, stoats, cats etc) I have used the inner tube core off of silage wrap (the plastic they but around silage bales), cut it in half to make 2, drilled a small hole through the middle and slide a rat bait on some wire through the holes (to hold the bait in the middle of the tube). instant bait tube at no cost.
Cheers
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