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Limedoser on the West River Sheet Harbour
by Atlantic Salmon Federation on 

Edmund Halfyard explained how the West River River Sheet Harbour.

 

Was 4.3 to 5.5, and now is 5.0 to 7.5. Much of the mainstem is now within target. Have also noticed a reduction in severity of episodic minima.

 

Looking at invertebrates, found a community shift in invertebrates following the beginning of the liming. There was also greater abundance.

 

Electrofishing showed a significant increase in parr 10 km below the doser. The data is also showing that the smolt are increasing up as high as 13,000 vs. 3,000 in the system.

 

Lime dosing feasible but careful planning is required. We also found that monitoring is expensive. It requires sufficient pre-treatment data. Also, liming should be considered only as part of a larger program.


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Temperature Stresses and Movement
by Atlantic Salmon Federation on 

Emily Corey

 

Emily CoreyOn the Little Southwest Miramichi River, we researched cooler refugia, for example Catamaran Brook. They asked whether the juvenile Atlantic salmon moved during thermal events. What they found was that the fish moved by as much as 11 km., and did not return to their original area for the remainder of the year.

 

To compare data from another river they chose the Riviere Ouelle. But although the water temperatures did peak above 27 C, they did not get aggregations in the same way.

 

When they switched to research in the lab, the work suggested that exposure to higher temperatures, around 33.2 C, the salmon parr acclimate. Not far above that, the salmon parr were unable to deal with the temperatures.

 

It showed how important the refugia were in the system. These areas needed riparian buffers.


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Importance of marine nutrients to a river system
by Atlantic Salmon Federation on 

Kurt Samways

 

Marine derived nutrients in natural and model systems in eastern North Americas

 

Back in 1967 the nitrogen brought into the Saint John system by Atlantic salmon was the equivalent of 960 cows for one day. Now a 12th of this.

 

Looked at how marine-sourced nutrients were taken up in rivers, and found that where the marine-sourced nutrients prevailed, there were many more invertebrates.

 

This resulted in bigger salmon parr, and healthier salmon parr.

 

Particularly the Omega 6 fatty acids resulted in increased brain size during development.

 

It was important that the nutrients were in biological form rather than inorganic nutrients.

 

The nutrients only affect a very small zone in a stream, so researching the impact, one needs to focus efforts.


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The future, beyond the Penobscot Restoration Plan
by Atlantic Salmon Federation on 

Tim Sheehan

 

Marine survival and the impact of dams are the two main insults to the Atlantic salmon of the United States. Period.

 

We needed to quantify the impact of dams on the Penobscot system. There are 15 federally licensed dams on the system.

 

At the stages of Eggs, smolts, postsmolts and adults we looked at the relationship with the dams.

 

We expect to see a large increase with the removal of the Penobscot dam, but we are still entirely dependent on hatchery fish. And what is driving the issue is marine survival. If we had an increase of 4x in marine survival, we would be having returns of 10,000 salmon.

 

The rule that the dams now will need to have a 95% survival upstream and 96% downstream will have a large impact in the future.

 

 


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Diversity in Salmon River Restoration
by Atlantic Salmon Federation on 

Rory Saunders reviewed the massive Penobscot River restoration, and how important it was to bring along other species.

"These other species provide important parts of the salmon's environment. We are taking a multi-species approach in the Penobscot project," said Saunders.

"We mapped areas where fish can reach, and others where it is difficult, or impossible," he said, "The project provides a substantial improvement in the ease by which fish can move in the system."

Lower river species will regain 100% of their habitat, and if the five fishways can be passed, including Milford which is not yet built, many other species will benefit.

"We need to do more to see that the Penobscot restoration project reaches its potential," says Saunders.

He ended by providing an overview of the scientific monitoring that has been developed since 2002, and now is very detailed.

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