Yeah...... but will she still dig a redd and dump her load? And if she does what if a 23 lb. wild buck wastes some of it's precious milt on those worthless eggs?
I still like Plan A, Seek and Destroy. I'll toss the carcasses back in the river, I promise.
Why would a fine stud like that bother wasting its time on low-life hatchery trash? Come on get serious!

OK seriously, any 23 pound wild buck is carrying enough jizz to spray every redd within a 5 mile radius with his load. That fish will spawn with as many hens as he can possibly bed with. Wasting a squirt or two on hatchery trash probably doesn't amount to much... there'll be plenty left to sow his wild oats with another hot wild hen.
On the other hand, a hatchery hen "spayed" by the fNp method has ZERO chance of perpetuating her inferior genetics. It's basically a genetic dead end for her entire brood... which is effectively what would happen anyway, except that the carcass gets put to better use.
The only other way to achieve live sterilization is by surgical oophorectomy. No eggs, no babies. Not sure anyone on this board has the kahunas or the skills to pull that off, though, especially if the goal is to make sure the "patient" survives the operation.
I see the bigger problem as being the wimpy yet hyper-promiscuous hatchery bucks, gang-banging and sneak-spawning every hen they get a chance at. Every wild redd they spray over will automatically lose a portion of the brood.
All the more reason to retain every last hatchery buck you can legally tag!
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"Let every angler who loves to fish think what it would mean to him to find the fish were gone." (Zane Grey)
"If you don't kill them, they will spawn." (Carcassman)
The Keen Eye MDLong Live the Kings!