Read Henry Williamsons Salar the Salmon he writes about precocious parr fertilising the eggs, I worked in a hatchery and we used Precocious Parr to make up the amount of milt we needed for the job, so nature will take care of its own. I worked on Loch maree when they were trapping seatrout for breeding we trapped over 30 male trout and only 3 females
I suppose it depends on stock evaluation whether you have C&R easgach1