juandesooka
Active Member
If you're interested, on right now on CBC am, 12:45 Tuesday, show on salmon hatchery/farming.
cbc salmon hatchery/farming show
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juandesooka
Active Member
Darn...may have missed it.
It was about salmon ranching when I turned on the radio, now about whether or not pickled herring tastes good. Good thing they have the the UBC Fisheries professor to answer those questions [
)]
What I briefly heard in the salmon ranching point was that it won't work to increase stocks. The river can only accommodate so many fish, and eventually can't support any more. So, I think the point is that hatcheries can only develop fish to a point in any given river.
I had an interesting conversation with the person in charge of the San Juan Enhancement Society, the hatchery in Port Renfrew. One thing that struck me: when they talk about "escapement", I always assumed that was fish getting out of the net pens, or something like that. Instead, it means how many fish they release that are able to make it back into the river to spawn....escaping people, whales, seals, and I guess disease, climate, and anything else out to get them. He said escapement is less than 0.1%, so maybe 8 out of 10,000 make it back.
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http://fishingportrenfrew.ca
http://fishingsooke.ca
It was about salmon ranching when I turned on the radio, now about whether or not pickled herring tastes good. Good thing they have the the UBC Fisheries professor to answer those questions [
)]What I briefly heard in the salmon ranching point was that it won't work to increase stocks. The river can only accommodate so many fish, and eventually can't support any more. So, I think the point is that hatcheries can only develop fish to a point in any given river.
I had an interesting conversation with the person in charge of the San Juan Enhancement Society, the hatchery in Port Renfrew. One thing that struck me: when they talk about "escapement", I always assumed that was fish getting out of the net pens, or something like that. Instead, it means how many fish they release that are able to make it back into the river to spawn....escaping people, whales, seals, and I guess disease, climate, and anything else out to get them. He said escapement is less than 0.1%, so maybe 8 out of 10,000 make it back.
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http://fishingportrenfrew.ca
http://fishingsooke.ca
Glad you are getting to know the ropes 
It is true that it makes no sense to produce a huge amount of salmon numbers if the river can only support so many. There are formulas that calculate the rearing and spawning capacity of a river depending on i.e. gravel bed area, shaded pools and riparian vegetation. That's why hatchery systems (only way this excess can occur these days) should open up for fish retention once the targeted number is reached because more fish spawning at that point will not achieve more juveniles that survive. If you are interested there is good literature out there...
In good years escapement can be 2% and in very good years up tho 4%.
It is true that it makes no sense to produce a huge amount of salmon numbers if the river can only support so many. There are formulas that calculate the rearing and spawning capacity of a river depending on i.e. gravel bed area, shaded pools and riparian vegetation. That's why hatchery systems (only way this excess can occur these days) should open up for fish retention once the targeted number is reached because more fish spawning at that point will not achieve more juveniles that survive. If you are interested there is good literature out there... In good years escapement can be 2% and in very good years up tho 4%.
S
sockeyefry
Guest
Chris,
Salmon ranching has nothing to do with River capacity for spawning. It is a form of aquaculture in which smolt are released and harvested when they return to the general vicintiy of the release site. The State of Alaska has a very large salmon rranching industry. Most release sites in the State of Alaska are chosen for their close proximity to traditional fishing grounds, or are at each of the established hatcheries. It is not for stock enhancement, but for harvest enhancement, and most are in areas where there is no suitable riverine habitat for spawning.
Salmon ranching has nothing to do with River capacity for spawning. It is a form of aquaculture in which smolt are released and harvested when they return to the general vicintiy of the release site. The State of Alaska has a very large salmon rranching industry. Most release sites in the State of Alaska are chosen for their close proximity to traditional fishing grounds, or are at each of the established hatcheries. It is not for stock enhancement, but for harvest enhancement, and most are in areas where there is no suitable riverine habitat for spawning.
I know sockeyefry. I think juandesooka was talking about escapement of ordinary meaning - he talked to the San Juan Enhancement Society and they don't do ranching but ordinary river enhancement.
But still thanks for explaining to all who may not know what ranching is...
But still thanks for explaining to all who may not know what ranching is...
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