I am sure they would. First I can not speak for the GG today and how they do. I do know that from my dealings with Ken (before he died) that the ones I had got smaller with each breeding cycle once introduced to your pond. He told me to think of it like this. The ones I got from him where a F1 direct decendant strain. There offspring would be a smaller F2 version and so on. WAY Back then any GG you got from anyone other than Ken at Kens Fish Farm where not going to get as big as his. I went with a plan to grow out some giant F1 GG and it worked well for me in the mid to late 90's. I also think the colder climates probably ould not grow as large a fish either.
BTW you can go to this web site and look at the pictures and you will see the same one i posted. Kens fish farm
