35 years after, by Bob Hooton. A salmon crisis is here!
- Thread starter OldBlackDog
- Start date
mbowers
Well-Known Member
https://fisheries.org/2018/04/new-r... more Pacific salmon,4% of total salmon catch.
- There are more Pacific salmon now than ever before since comprehensive statistics began to be collected in 1925 (i.e., catch plus spawning escapement). However, Chinook and Coho salmon and steelhead trout are depressed throughout much of their range, representing only 4% of total salmon catch.
- Major hatchery production for these three species occurs in Alaska (Prince William Sound, Southeast Alaska), the Sakhalin and Kuril Islands (Russia), and Japan. In Alaska, up to 48% of total commercial salmon harvest is from hatchery salmon according to the Alaska Department of Fish and Game.
- The authors recommend the following changes in salmon management: 1) mark or tag all hatchery salmon so they can be identified after release, 2) estimate hatchery- and natural-origin salmon in catches and escapement, and 3) maintain this information in publicly accessible databases.
Not in BC, Wash, Ore, Cal
mbowers
Well-Known Member
That's the point though: Alaska and Russia are hijacking the entire Pacific with all of the ocean ranched hatchery fish. Alaska has exactly the same problem with its wild chinook size and numbers as we do and they have near pristine habitat.
I believe that quote from the Ruggerone/Irvine article includes all hatchery salmon, as well - incl the AK chum hatcheries. So it isn't a reference specific only to wild salmon, or only wild Southern stocks...
Here's another quote: "Hatchery salmon now constitute ~40% of the total biomass of adult and immature salmon in the ocean, largely because of Chum Salmon that spend more years at sea."
Here's another quote: "Hatchery salmon now constitute ~40% of the total biomass of adult and immature salmon in the ocean, largely because of Chum Salmon that spend more years at sea."
wildmanyeah
Crew Member
Canada is a big looser in this, I believe there will come a time in the future where they will negotiate hatchery production as part of a treaty and because Canada's hatchery production is almost nil comparatively will come out as big losers in the negotiations.
should go with the nuclear option and push out as much hatchery fish and force the hand
should go with the nuclear option and push out as much hatchery fish and force the hand
mbowers
Well-Known Member
Unless the international politics change I think the nuclear option is our only scientific option to have any fish available to catch.
Wild salmon and steelhead are remarkably prolific when they are given a chance. Chinook are invasive and grow to huge sizes in Chile. Chile has 25 or more times the density of fish farms as BC does and still the chinook are exploding in size and numbers. Alaska has no "fish farms" and its chinook are also failing like BC's. What Chile doesn't have is pink salmon ranching..
Don't forget the SRKW deaths / low birth rates have an extremely statistically significant 2 year pattern for which the only explanation available so far is the huge increase in pink salmon: ocean ranching is a major cause of that.
https://vancouversun.com/news/local...-three-times-more-likely-to-die-in-even-years
Interesting hypothesis, mbowers - thanks for sharing. It's likely gonna be way more complicated than adults pinks obscuring the larger Chinook targets. Do adult pinks and returning adult Chinook cohabituate the same exact feeding spots in 4D (2D + depths + time)? What about the juvies? Wouldn't small pinks outmigrating after hatching in the odd year springs after being laid as eggs in the fw during the even-year summer/fall returns end-up being prey for many species including subadult Chinook? Do both river-type and ocean-type Chinook life histories follow that same 2 year pattern? Lots of connections beyond this, as well wrt when/where plankton/zooplankton grows and is eaten.
journals.plos.org
Lots to think about and get a handle on...
Zooplankton variability in the Strait of Georgia, Canada, and relationships with the marine survivals of Chinook and Coho salmon
The Strait of Georgia, Canada, has complex interactions among natural and human pressures that confound understanding of changes in this system. We report on the interannual variability in biomass of 12 zooplankton taxonomic groups in the deep (bottom depths greater than 50 m) central and...
Lots to think about and get a handle on...
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wildmanyeah
Crew Member
Summer chinook salmon fishing to close on Columbia River
Meanwhile, ODFW biologists and managers are keeping a close eye on lower-than-expected numbers at Willamette Falls.
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Dave H
Well-Known Member
Link to article re: Chile and Chinook.
Chiles New Salmon Fishery written by Harry Morse
Featured in Oct/Nov 2015 STS “Do you think anyone is going to believe us when we tell them how big they are and how many fish are down here,” said Gary Loomis. “This is an amazing fishery. We have landed more chinook salmon in the 40 to 50 pound class than below 40 pounds. This is a new Alaska...
www.salmontroutsteelheader.com
Wonder how I can get my rowboat down there. LOL
Take care.
“It's not just Alaska. It's everywhere where chinook are,” she said. “The reports we're getting from pretty much everyone is that with a few minor exceptions, chinook have been down everywhere, so that kind of points towards a cause that can affect things on a really large geographic scale. So not local causes.”
Why are chinook runs declining in Bristol Bay, while sockeye runs are shattering records?
Chinook salmon numbers have declined significantly in the Nushagak district, falling far short of in-river escapement goals in five of the last six years. Yet at the same time, sockeye runs are at an all time high. KDLG’s Jessie Sheldon investigates what’s known and unknown about these trends.
www.kdlg.org
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