I can. Thanks for that.
The hatcheries that are pouring billions of fish into the north Pacific are commercial hatcheries. Most of the salmon you buy in the grocery store these days is coming from fish that returned to those hatcheries. Pink salmon are especially prolific. They grow very fast, so they're a favourite. You also have what we refer to as a compensation hatchery at the Whitehorse dam, which is to compensate for the damage they're doing to the wild salmon.
Then there are conservation hatcheries. These are, generally speaking, small hatcheries that are very specific. They're focused on a single stock, you could say. I could use as an example McIntyre Creek near Whitehorse, a stream that at one time had a very prolific chinook salmon return. Now there are practically none. A conservation hatchery would seek to take brood stock, incubate them in a good place and then plant them into McIntyre Creek for a cycle, which we will call seven years, in hopes of restarting that run.
My understanding is that you have to be very careful with that sort of hatchery. The fish that are coming back from the hatchery have what are called epigenetic effects. The genes are actually affected. If those fish start to breed with the wild fish, over time and over several cycles, you can actually compromise the genetics of the wild fish.
Conservation fisheries can be, I think, very effective in restoring the runs over a short period, usually one cycle, for a specific stream. That's what I understand a conservation hatchery to be.