Not sure who this biologist was, that talked at Scheele about eyes getting that big in 18 months but Chris Penne told me they grow 5 to 6 inches at the most. So at the beginning of their second year they were be around 12", so they could be 15" in 2,5 years, in lakes like Willard, that have lots of food. The kind of growth that biologist was talking about would be 10" per year, that would be crazy growth but who knows