I think the problem is when they get established early before other fish are stocked. With their large mouths (basically the same size mouth as a LMB of the same length) and aggressive nature they can get ahead of the other more desirable fish and keep them from establishing properly. They eat up everything in site just like an over abundance of LMB of that size would do.
I'm actually adding a few GSF to my main pond as well as a few natural hybrids that I'm getting from my sediment pond. But I already have a well established BG population with a gazillion (maybe two) BG. Not much chance of the GSF getting ahead of the BG. Friends grandson today caught a few of the GSF and hybrids I had put in earlier. I showed him how to tell the difference between GSF, HBG and BG. In our neck of the woods, they are all just incorrectly referred to as "perch". Been that way as long as I can remember.
Last edited by snrub; 05/27/16 02:30 PM.