ahvasta :
If I recall your pond has a number of pallet structures (and others)in shallow water. Those are good for FH spawning sites as they provide multiple slats for spawning and a place (inside the pallet) for them to seek protection. I use pallets placed flat for that purpose. If you have extra pallets you could put them out. They will also use the underside of limbs etc. but I dont know if they will use your hay bales or tires.
What is your plan for the FH ? Are they just to start you forage base or will you try to keep an ongoing population in the pond ? I have been thinking about methods to keep a viable population going in a pond with existing predators.
Links :
http://aquaticpath.umd.edu/fhm/intro.html http://www.uaex.edu/aquaculture2/FSA/FSA9003.htm
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