Nature is fascinating and every pond is different because there is so many variables. If your GSH were stocked the same time or even 6 months before and your perch were only 6-8" to start your going to be in great shape. We stocked this way and do not have near any over population after four years of yellow perch only.

[Linked Image from corvettejunkie.com]
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7/8th of an acre, Perch only pond, Ontario, Canada.