I've got the same situation in a clients 1 ac pond. Pond was dug where there was a wet spot, and no fish were stocked for a year. Then FHM and GSH were stocked, with RES and YP following 6 months later, with the plan to stock SMB the following year. Next Fall, before SMB were stocked, some fishing was done and GSF were found; LOTS of GSF. I used a fyke net over a period of a couple of weeks to catch a lot, then stocked 100 HSB that were 10"-12", and 25 2# RBT. No feeding is done in the pond. We'll see next Spring how many GSF are left.

The plan for that pond is a RES/YP/SMB pond

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).