KFG,
Do you have another job to go to? From what I hear, breeding and rearing the fry is a full time job. Being able to cull the fry is another story. I getting overwhelmed by just talking about it.
With that large a pond, I am very interested in how you will be maintaining your water quality. Water quality has become somewhat of an obsession with me since joining this forum. I'm just trying to plan a 10K-12K gallon concrete pond and I'm finding that maintaining optimal quality water 24/7 to grow-out quality koi can be near impossible.
Can you share with me your water filtration design and set-ups. Judging from the size of your pond(s), you'll be working with 160,000 gallons (60x60x6), how are you planning to filter or move the water in your ponds? Are you incorporating typical aquaculture set-ups? I would love to see progress photos of your project as you strive to meet your goals. I'm getting inspired because my ponds (10K and 2K gal.) seem so insignificant to 160K+.