Make the circle of rocks for spawning smaller (abt 3-4ft dia) and more of them maybe 3-6. If electr4icity innot an option consider aerating with a windmill and put the diffuser in the deep basin. If the pond has lots of trees with leaf drop around it then summer and winter kills even with a windmill are very likely and SMB will have a hard time surviving. Organic inputs from terrestrial sources are very 'hard' on overall pond water quality.
I very much doubt that you will grow very large SMB (15"+) without more types of forage and without pellet feeding. HOwever it could be done if you keep the number of SMB few so the few that are present have lots of almost unlimited food. Pellet feeding will greatly enhance the smallie population for numbers and size. It takes a lot of the proper food and sizes of food to grow larger SMB & LMB & YP and HSB, etc. Crayfish should be an addition along with proper habitat of broken concrete along or rip-rap lining the shoreline at least one shoreline, and preferably the downwind shore. Small fish esp fingerling SMB will use the concrete areas & piles for refuge. Contractors, villages and towns often have waste broken concrete. Start stock piling it.
I would do some minnow trapping in your streams. Bluntnose are no doubt common and pretty easy to recognize with the dark lateral stripe and dark spot at the base of the tail. Try to add at least 20-30 with the FHM one spawning season before the SMB. A good time to trap them is in fall or spring before spawn in mid to late May. Come see me and I will catch some for you. I occassionally get to Kokomo and I could bring you a few with spotfin shiner breeders if you meet me there.
Views of bluntnose:
http://www.dnr.state.oh.us/Home/species_...66/Default.aspxhttp://www.roughfish.com/~roughfis/species/219
http://www.roughfish.com/~roughfis/content/spotfin-shiner-and-bluntnose-minnow
http://www.nae.usace.army.mil/recreati/nhl/nhl%20fish/nhlbluntnoseminnow.htmlhttp://therockyriver.com/library/fish-id-catalog/bluntnose-minnow/http://dnr.wi.gov/fish/vhs/bnmin.htmlYour water level may drop quite a bit if the pond is a leaker so a little extra depth may be a big plus. The deeper hole should not really be a hole nor trench but a small sloped basin maybe 16'-20 X 40'-50' maybe 0.05-0.1 ac.
