wildmanyeah
Crew Member
Yes, and most importantly climate change has increased the number of of north pacific salmon not decreased it. So has climate change been bad for salmon?
West Coast Salmon Vulnerable to Climate Change, but Some Show Resilience to Shifting Environment
- Thread starter agentaqua
- Start date
Yes, and most importantly climate change has increased the number of of north pacific salmon not decreased it. So has climate change been bad for salmon?
assuming you are trolling yet again WMY - as not just this article - but others articles & posted science on this thread and on others on this forum have described the very real & yet-to-come impacts on fish stocks vis-a-vis global warming/climate change.You have already commented on many of these threads - so I assume you are providing an opportunity for clarification to the rest of the readership - if not trolling...
In short: Northern regions (eg. Alaska and the Arctic) will benefit from either increases in salmon numbers - or have changes wrt the arrival of Pacific salmon in their areas. In the Southern part of the ranges of Pacific salmon (e.g. California up to Southern BC) salmon populations are and will continue to be put under increasing stress due to warming of both fresh- and salt-water components of their life-cycles.
Winners and losers in that latitudinal shift of species ranges - dependent upon where one lives and what they expect the future should look like for fisheries resources.
Ultimately, increasing air and ocean temperatures, melting of glaciers, rising of sea levels, increases in fire and severe weather are affecting us all and will continue to increase in severity for many hundreds if not thousands of years does not sound like a win-win for humans - overall.
In short: Northern regions (eg. Alaska and the Arctic) will benefit from either increases in salmon numbers - or have changes wrt the arrival of Pacific salmon in their areas. In the Southern part of the ranges of Pacific salmon (e.g. California up to Southern BC) salmon populations are and will continue to be put under increasing stress due to warming of both fresh- and salt-water components of their life-cycles.
Winners and losers in that latitudinal shift of species ranges - dependent upon where one lives and what they expect the future should look like for fisheries resources.
Ultimately, increasing air and ocean temperatures, melting of glaciers, rising of sea levels, increases in fire and severe weather are affecting us all and will continue to increase in severity for many hundreds if not thousands of years does not sound like a win-win for humans - overall.
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wildmanyeah
Crew Member
it's not really trolling Climate change has increased the total abundance of pacific salmon and that's far from what's being said in the media.
PS i also love how you and GLG now call people trolling who have different opinions than yours.
PS i also love how you and GLG now call people trolling who have different opinions than yours.
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Birdsnest
Well-Known Member
When ideology cant defend itself with facts it transforms its defence into accusations of trolling, shill, uneducated, racist, fascist, ****, far right, industry pundant etc, etc....
Thats all your seeing here. Meaningful discussion is a thing of the past. The ability to agree to disagree is a thing of the pasts.
Our problems today are the product of this thinking.
Anyway, I think that salmon have always had to overcome issues. Thats what makes them incredible animals. I just don't buy the fear mongering about climate change. I feel sorry for younger people who have to try a grasp a sense of hope in this climate of fear.
speaking of alter-egos...
The article described why that author quoting Beamish thought pinks were winning and other species were not: "Beamish thinks they are better adapted to warming oceans than even-year pinks and other salmon species.".
You already provided a quote from the article (post #19) so obviously you read it.
So now quoting my alter ego: "...troll someone else there son."
The article described why that author quoting Beamish thought pinks were winning and other species were not: "Beamish thinks they are better adapted to warming oceans than even-year pinks and other salmon species.".
You already provided a quote from the article (post #19) so obviously you read it.
So now quoting my alter ego: "...troll someone else there son."
Just cleaned up another thread in the Conservation section and this one is following a similar path. Time to knock off the labeling of other members and stick to the topic. If you don't want to be part of a mature debate that respects other's point of view and doesn't involve put downs, name calling etc. then just stay out of the conversation.
GLG
Well-Known Member
Modelling the impacts of climate change on riverine thermal regimes in western Canada’s largest Pacific watershed
Aug 6, 2019
Abstract
Quantification of climate change impacts on the thermal regimes of rivers in British Columbia (BC) is crucial given their importance to aquatic ecosystems. Using the Air2Stream model, we investigate the impact of both air temperature and streamflow changes on river water temperatures from 1950 to 2015 across BC’s 234,000 km2 Fraser River Basin (FRB). Model results show the FRB’s summer water temperatures rose by nearly 1.0 °C during 1950–2015 with 0.47 °C spread across 17 river sites. For most of these sites, such increases in average summer water temperature have doubled the number of days exceeding 20 °C, the water temperature that, if exceeded, potentially increases the physiological stress of salmon during migration. Furthermore, river sites, especially those in the upper and middle FRB, show significant associations between Pacific Ocean teleconnections and regional water temperatures. A multivariate linear regression analysis reveals that air temperature primarily controls simulated water temperatures in the FRB by capturing ~80% of its explained variance with secondary impacts through river discharge. Given such increases in river water temperature, salmon returning to spawn in the Fraser River and its tributaries are facing continued and increasing physical challenges now and potentially into the future.
added:
Link to paper
AA
https://www.nature.com/articles/s41598-019-47804-2
Aug 6, 2019
Abstract
Quantification of climate change impacts on the thermal regimes of rivers in British Columbia (BC) is crucial given their importance to aquatic ecosystems. Using the Air2Stream model, we investigate the impact of both air temperature and streamflow changes on river water temperatures from 1950 to 2015 across BC’s 234,000 km2 Fraser River Basin (FRB). Model results show the FRB’s summer water temperatures rose by nearly 1.0 °C during 1950–2015 with 0.47 °C spread across 17 river sites. For most of these sites, such increases in average summer water temperature have doubled the number of days exceeding 20 °C, the water temperature that, if exceeded, potentially increases the physiological stress of salmon during migration. Furthermore, river sites, especially those in the upper and middle FRB, show significant associations between Pacific Ocean teleconnections and regional water temperatures. A multivariate linear regression analysis reveals that air temperature primarily controls simulated water temperatures in the FRB by capturing ~80% of its explained variance with secondary impacts through river discharge. Given such increases in river water temperature, salmon returning to spawn in the Fraser River and its tributaries are facing continued and increasing physical challenges now and potentially into the future.
added:
Link to paper
AA https://www.nature.com/articles/s41598-019-47804-2
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wildmanyeah
Crew Member
Apparently all we need to do if we want good fishing and salmon to return is not to fish. I have never had as good fishing in Vancouver as the last 10 days and not just number wise size too hogs out there. Most reds I’ve ever caught or seen around and not the normal 12 pounders l. These things are like 15 to 30 pounds.
OldBlackDog
Well-Known Member
And I wonder if they modeled the manipulation of water flows in their estimates. Seems man is controlling the temperatures of the river.
New
Information Bulletin: Water Flow at Big Bar Landslide
Aug 9, 2019
Water flow management is critical to the success of salmon being able to navigate past the Big Bar Landslide. Without correct water conditions, it can be difficult or impossible for the migrating fish to travel past the obstruction zone.
If the water flow is too fast, salmon will not be able to move upriver since the current would be too strong. If the flow is too slow, it will leave shallow pools which the salmon would then be unable to leap out of. What is needed is water movement that is neither too slow nor too fast, but just right. At the slide site, water flow is 2,900 m3/s (cubic metres per second) at various times which is currently presenting a significant obstacle for fish passage.
There are many tools at Incident Command’s disposal to manage water flow. Large rock manipulation has been critical to the success of this project. Altering the rock landscape by removing, moving, or adding rock to the site can change water flow and velocity patterns to better allow fish movement.
Another tool is managing water flows from regulated tributaries upstream, including the Nechako River. Ongoing summer releases by Rio Tinto Alcan, from the Nechako River system, allows the cooling of water to help salmon; however, due to this emergency situation, the Province had ordered that flows be reduced to assist in operations at the slide while still meeting temperature requirements.
The Province is committed to working with Rio Tinto Alcan to ensure that releases from the facility balance the needs at the Big Bar Landslide and the resident fish in the Nechako, including the endangered sturgeon population.
Altered flow releases from the dam have assisted efforts at the Big Bar Landslide by providing stable water flows at the site; however, as of August 8, 2019, based on temperatures in the Nechako river predicted by Rio Tinto modelling, Rio Tinto Alcan was asked by the Province to release water to provide cooling and to immediately revert back to maintaining regular flows as per its summer temperature management program. Rio Tinto Alcan has accommodated this request.
https://www2.gov.bc.ca/assets/gov/p...-2019/19_71w20ay_water_flow_august_9_2019.pdf
To be neutral between right and wrong is to serve wrong.
New
Information Bulletin: Water Flow at Big Bar Landslide
Aug 9, 2019
Water flow management is critical to the success of salmon being able to navigate past the Big Bar Landslide. Without correct water conditions, it can be difficult or impossible for the migrating fish to travel past the obstruction zone.
If the water flow is too fast, salmon will not be able to move upriver since the current would be too strong. If the flow is too slow, it will leave shallow pools which the salmon would then be unable to leap out of. What is needed is water movement that is neither too slow nor too fast, but just right. At the slide site, water flow is 2,900 m3/s (cubic metres per second) at various times which is currently presenting a significant obstacle for fish passage.
There are many tools at Incident Command’s disposal to manage water flow. Large rock manipulation has been critical to the success of this project. Altering the rock landscape by removing, moving, or adding rock to the site can change water flow and velocity patterns to better allow fish movement.
Another tool is managing water flows from regulated tributaries upstream, including the Nechako River. Ongoing summer releases by Rio Tinto Alcan, from the Nechako River system, allows the cooling of water to help salmon; however, due to this emergency situation, the Province had ordered that flows be reduced to assist in operations at the slide while still meeting temperature requirements.
The Province is committed to working with Rio Tinto Alcan to ensure that releases from the facility balance the needs at the Big Bar Landslide and the resident fish in the Nechako, including the endangered sturgeon population.
Altered flow releases from the dam have assisted efforts at the Big Bar Landslide by providing stable water flows at the site; however, as of August 8, 2019, based on temperatures in the Nechako river predicted by Rio Tinto modelling, Rio Tinto Alcan was asked by the Province to release water to provide cooling and to immediately revert back to maintaining regular flows as per its summer temperature management program. Rio Tinto Alcan has accommodated this request.
https://www2.gov.bc.ca/assets/gov/p...-2019/19_71w20ay_water_flow_august_9_2019.pdf
To be neutral between right and wrong is to serve wrong.
Modelling the impacts of climate change on riverine thermal regimes in western Canada’s largest Pacific watershed
Aug 6, 2019
Abstract
Quantification of climate change impacts on the thermal regimes of rivers in British Columbia (BC) is crucial given their importance to aquatic ecosystems. Using the Air2Stream model, we investigate the impact of both air temperature and streamflow changes on river water temperatures from 1950 to 2015 across BC’s 234,000 km2 Fraser River Basin (FRB). Model results show the FRB’s summer water temperatures rose by nearly 1.0 °C during 1950–2015 with 0.47 °C spread across 17 river sites. For most of these sites, such increases in average summer water temperature have doubled the number of days exceeding 20 °C, the water temperature that, if exceeded, potentially increases the physiological stress of salmon during migration. Furthermore, river sites, especially those in the upper and middle FRB, show significant associations between Pacific Ocean teleconnections and regional water temperatures. A multivariate linear regression analysis reveals that air temperature primarily controls simulated water temperatures in the FRB by capturing ~80% of its explained variance with secondary impacts through river discharge. Given such increases in river water temperature, salmon returning to spawn in the Fraser River and its tributaries are facing continued and increasing physical challenges now and potentially into the future.
here;s the link to the whole article: https://www.nature.com/articles/s41598-019-47804-2
OldBlackDog
Well-Known Member
From the article,
. For example, there is only one site across the entire FRB with observed daily water temperature records for the complete study period of 1950–2015. The lack of comprehensive water temperature data limits our understanding of long-term river thermal changes, their predictability and the potential impact on species such as salmon. Insufficient data records also limit the analysis of Pacific Ocean climate variability that potentially modulates water temperatures at regional scales.
. For example, there is only one site across the entire FRB with observed daily water temperature records for the complete study period of 1950–2015. The lack of comprehensive water temperature data limits our understanding of long-term river thermal changes, their predictability and the potential impact on species such as salmon. Insufficient data records also limit the analysis of Pacific Ocean climate variability that potentially modulates water temperatures at regional scales.
As the Bering Sea Warms, Warm-Water Fish Are Moving In, NOAA Says
https://www.knom.org/wp/blog/2019/0...arms-warm-water-fish-are-moving-in-noaa-says/
https://www.knom.org/wp/blog/2019/0...arms-warm-water-fish-are-moving-in-noaa-says/
wildmanyeah
Crew Member
This video has been going around claiming that climate change in alaska is killing salmon '
Cook Inlet Aquaculture Association
5 hrs ·
Many of you have seen a video showing dead pink salmon in Tutka Bay posted by My Way Alaska on August 10, 2019. We want to take this opportunity to explain what you are viewing. To cover operational costs for the hatchery programs, CIAA develops cost recovery harvest plans for areas where hatchery raised fish will be returning, including Tutka Bay Lagoon in Kachemak Bay. Through a public bidding process, CIAA licenses the cost recovery operation to processors, who in turn contract for the catcher vessel (a seiner) to harvest the fish. Once the fish are harvested, they are taken straight to the processor. These fish are not used for hatchery broodstock. On July 28, the cost recovery seiner was fishing in Tutka Bay Lagoon. It had a purse seine full of pink salmon when the bottom of the net snagged on something and ripped. Unfortunately, the fish were released and a number of them died in the process. We estimate that approximately 700–1,200 fish were lost. Accidents like this do sometimes happen to commercial fishing vessels, and we are sorry for any confusion it has caused. Please share.
Cook Inlet Aquaculture Association
5 hrs ·
Many of you have seen a video showing dead pink salmon in Tutka Bay posted by My Way Alaska on August 10, 2019. We want to take this opportunity to explain what you are viewing. To cover operational costs for the hatchery programs, CIAA develops cost recovery harvest plans for areas where hatchery raised fish will be returning, including Tutka Bay Lagoon in Kachemak Bay. Through a public bidding process, CIAA licenses the cost recovery operation to processors, who in turn contract for the catcher vessel (a seiner) to harvest the fish. Once the fish are harvested, they are taken straight to the processor. These fish are not used for hatchery broodstock. On July 28, the cost recovery seiner was fishing in Tutka Bay Lagoon. It had a purse seine full of pink salmon when the bottom of the net snagged on something and ripped. Unfortunately, the fish were released and a number of them died in the process. We estimate that approximately 700–1,200 fish were lost. Accidents like this do sometimes happen to commercial fishing vessels, and we are sorry for any confusion it has caused. Please share.
wildmanyeah
Crew Member
Cowichan is going to have a hard go of it for years to come and thats the importance of keeping the hatchery on it.
I read in the cowichan valley climate change report by 2050 they expect to have a 360 year growing season. I dont know how much the valley is farmed now or in the future but water demand seems like its only going to increase.
wildmanyeah
Crew Member
https://www.cbc.ca/news/canada/british-columbia/pink-salmon-zooplankton-1.5243828
Voracious pink salmon thriving at other species' expense, researchers say
Voracious pink salmon thriving at other species' expense, researchers say
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