Broodstock - simplified.reelangler said:I don't understand the whole brood concept. How does it work, what is it for, what do they do with the stuff after? PM if this is off topic. Thanks, appreciate it.
Because some of thehatchery fish manage to spawn (with wild fish) and this technique ensure the most genetic diversity remains in the overall stock.reelangler said:But doesn't this eventually lower the amount of wild fish in the rivers? Why can't this be done with hatchery steel?
When you spawn hatchery fish with hatchery fish through multiple generations you get a poor quality steelhead. Virtually all of the bad mouthing that has been seen in the past about American hatchery fish is the result of using hatchery fish to make hatchery fish over and over and over again and using only a couple of strains in all of the rivers. Using wild fish every year to make hatchery fish lessens the overall negative imprint that those offspring of wild parents would have on the native population of fish.reelangler said:Why can't this be done with hatchery steel?
Depends who you ask. I have never seen a study that states that using wild parents for broodstock and returning the smolts to their river of origin (eg wild vedder parents and returing the ensuing smolts into the Vedder and no other river) has had a negative impact on the wild population. What I have seen is are studies showing that using hatchery fish to make hatchery fish for several generations negatively impacts the wild population. What I have also seen is studies that show that fish (even wild brood fish) that are used as parent stock for a river sysytem other than their original one (eg wild Vedder fish used to supplement any other river) also will have a negative effective on the population of fish which is native to the river being stocked.reelangler said:But doesn't this eventually lower the amount of wild fish in the rivers?