If you did have a LMB spawn in Early Summer '16, and those 'new' LMB frye grew to 10" in about 8 months or so, than you have accomplished that growth cycle twice.
From June '15 to June-ish '16, the initial LMB stockers grew to at least 10-12" in about (12) months, and spawned.
From June-ish '16 to February '17, you're already at 10" and it's only been (8) months.
I'd want to see more before doing anything major.
Excerpt from Robert Crais' "The Monkey's Raincoat:" "She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."
