My guess is to keep the gene pool strong.HOOK said:I to have witnessed them with those black tubes every year i have been out there. they arent out all the time but you do see them and yes all the guys i have spoken to are always targetting the wild stock
why is this ? why do they seem to be after wild ones only?
There is no measurable difference between the genetics of hatchery and wild, precisley because there is no use of hatchery identified fish as brood stock. If 5% of a run is captured for brood stock and if only hatchery identified stocks were used as brood stock, over a very short time the gene pool would be reduced to only 5-10% of the original run. By ensuring that the brood stock are "wild" the diversity of the stock is ensured. Hatchery fish that survive the angler to actually spawn contribute their genetic code as well, meaning that "wild" fish have the real possibility of having one or both parents be hatchery fish. Although it took a 20 year study to prove it, it should come as no surprise that there is no difference in genetics in the two types of fish. The use of wild fish for brood stock every spawn was designed to produce exactly this result. Nice to see DFO get it right occasionallyhotrod said:Only wild fish are used for brood stacking.Although there is a ongoing debate about hatchery genetics opposed to wild,a recent twenty year study in the north has proven that there is no differance in genetics between wild stock and hatchery stock ......................................................
..........once upon a time the world was flat too! It's good to be picky though when it comed to broodstocking given the recent state of our west coast steelhead fishery!