Although the former owner rattled off several species of fish she thought were in the pond when we bought the property in 2009, we found only LMB, YP, and two 30+inch TGC. After observing and fishing the pond for a year, I discovered this invaluable PondBoss forum and started management. Except for limited patches of cattails and bulrushes, there was no vegetation whatsoever and no other cover.
And, although I'd found a few lures in the in the "tulies" and in the mud that indicated larger bass may have been present, it was a couple of years before we saw or caught a bass over 12"; all perch were 4' to 6" and very abundant.
Now there also are BG, GSF, HBG, 5 TGC, a very few SMB that have come down the irrigation ditch, and a piddling few BCP. I haven't seen my trout for several weeks and am assuming they're gone. At 6 and 7 years. they were very old for hatchery trout.