From what I understand, Sunken Lake was not stocked this year b/c there is no public access. Access is mandatory for all fish stocked from the department.
Mark - Those rainbow are not triploid, therefore they can theoretically reproduce, however there is no evidence of rainbows reproducing in the southern mainland (and they'd been stocking rainbows for decades). It is most likely related to pH.

BTW - Nice catch!
Eddie