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Nainu
Joined: 04 Nov 2003
Posts: 73
City/Region: Anchorage
State or Province: AK
C-Dory Year: 1991
C-Dory Model: 22 Cruiser
Vessel Name: Nainu
Photos: Nainu
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 Posted: Mon Dec 21, 2020 10:52 pm Post subject: |
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| smckean (Tosca) wrote: | | Quote: | | This spring I fished the Green River in Utah, caught dozens of trophy-sized brown trout, and returned with nothing but pictures. |
I'm not saying this applies to anyone posting here, but as a FYI thing.
Some years ago I spent 20 years working as a volunteer with the Washington State fish and Wildlife Dept on the biology and habitat of trout in the rivers, streams, and lakes of the Cascade Mountains. One thing I was surprised to learn from various studies the biologists I worked with conducted is the mortality rate of fish that are caught and released. Most folks don't realize that about 30% of fish released don't survive more than a few days. That mortality rate can climb to 70% if the fish are handled (even just for a photo), hooked too deeply, or overly exhausted from the fight. If you see any blood, they will most certainly die. |
Your figures are higher than I have heard for Pacific salmon. I would have to look up the numbers but they have done research here on the Kenai River where they implanted a tracking device in king salmon. Don't believe the mortality was particularly high. However, with respect to coho salmon, catch and release is in the neighborhood of 70%+ fatal if it occurs within 24 hours of the fish entering freshwater. The stress from being caught, when added to the already considerable stress caused when changing from salt to fresh water, is too much for most of the fish. But the one place where I have actually observed this happening is also a place where the brown bears make sure those fish don't go to waste. This could also be a factor in fish dying due to tire dust - they are under the stress of entering freshwater at a time when they have to endure the toxic stew that the tire dust causes.
I have witnessed a step decline in king salmon stocks here in southcentral Alaska in my time. Hoping against hope that it is just a temporary change in ocean conditions. |
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NORO LIM
Joined: 24 Apr 2008
Posts: 875
City/Region: Olympia
State or Province: WA
C-Dory Year: 2006
C-Dory Model: 23 Venture
Vessel Name: NORO LIM (sold 12/12/14)
Photos: NORO LIM
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| Posted: Tue Dec 22, 2020 1:09 am Post subject: |
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| TyBoo wrote: | | It is rather ironic that the scientists are blaming cars for this when it is their own fault, along with the engineers. If they had given us the flying cars they said we would have by now like they promised back when I was a kid we wouldn't be worrying about tires, now would we? |
Ah yes, and they told us that new clear energy would make electrical power free, and no need to worry about the loss of arable land because we will always have the largely untapped and limitless bounty of the sea, and also, you know, just generally "Better Living Through Chemistry." Mr. McGuire said it best "One word, plastics!"
Most of us have accepted the fruits of science with open arms and have benefitted mightily. Most of us will fight tooth and nail against surrendering up any of what we got. However, in the end there still is no free lunch.
_________________
Bill, Formerly on NORO LIM
2001 CD 16, 2001-2006
2006 CC 23, 2006-2014 |
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smckean (Tosca)
Joined: 18 Jan 2014
Posts: 975
City/Region: Guemes Island (Anacortes)
State or Province: WA
C-Dory Year: 2005
C-Dory Model: 25 Cruiser
Vessel Name: Tosca
Photos: Tosca
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| Posted: Tue Dec 22, 2020 6:10 pm Post subject: |
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| Nainu wrote: | | Your figures are higher than I have heard for Pacific salmon. |
That doesn't surprise me. The work I did was for trout primarily in high mountain lakes. That environment is highly stressful.....short "growing" season, very little to eat, few places to hide, etc. I would expect that salmon in the ocean would have a much better chance of surviving.
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Sandy McKean
Purchased Tosca in 2014
Re-powered to Yammi 200 in 2015 |
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Nainu
Joined: 04 Nov 2003
Posts: 73
City/Region: Anchorage
State or Province: AK
C-Dory Year: 1991
C-Dory Model: 22 Cruiser
Vessel Name: Nainu
Photos: Nainu
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| Posted: Tue Dec 22, 2020 7:14 pm Post subject: |
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| smckean (Tosca) wrote: | | Nainu wrote: | | Your figures are higher than I have heard for Pacific salmon. |
That doesn't surprise me. The work I did was for trout primarily in high mountain lakes. That environment is highly stressful.....short "growing" season, very little to eat, few places to hide, etc. I would expect that salmon in the ocean would have a much better chance of surviving. |
Salmon are also designed for a one way trip which I think makes them generally hardier to physical stress. If you haven't seen it, you wouldn't believe what some of those fish on the spawning ground can look like and still be swimming. |
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forrest
Joined: 02 Nov 2003
Posts: 381
City/Region: Chehalis
State or Province: WA
C-Dory Year: 2007
C-Dory Model: 26 Venture
Vessel Name: Long Story
Photos: Long Story
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| Posted: Thu Dec 24, 2020 12:31 pm Post subject: |
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Other reasons the salmon are declining:
Alaska over fishes British Columbia, Puget Sound, Columbia River, Tillamook and Sacramento River fish.
Juvenile Chinook salmon are netted along with Alaska ground fish.
British Columbia hammers Columbia River fish in retaliation for Washington trawlers over fishing Fraser River fish.
Chinese and Russian trawlers sneak into Alaskan waters.
Purse seines are sucking up all the bait fish so salmon have nothing to forage on(all to make protein pellets to feed farmed fish).
Seals wait at fish ladders to dine endangered salmon.
Farmed salmon net pens spread disease and parasites to the wild fish.
Tribal nets harvest the fish just as they are about to spawn.
And then there are the rubber tires that manage to kill the few that make it back...
I'm sure that I missed a few reasons.
Too many people after a limited resource. |
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