Comparison of Salmon Migration Systems

Question

Dams provide electricity, flood control, recreation and transportation, as well as water for domestic and agricultural use. However, dams also change the way rivers function and may interfere with the life cycles of salmon, steelhead, and other animals. They are barriers to juvenile salmon migrating to the ocean and an obstacle as adult fish return to the streams where they were born to spawn.

Dams affect the way water moves down a river by changing the amount and timing of flow, as well as the water's temperature and chemical characteristics. Because dams transform the upstream habitats from rivers into lakes, they change the amount and location of available habitat and significantly alter the salmon’s interaction with predators and competitors.

For salmon to thrive, it is important to provide safe, swift passage past dams for juveniles traveling to the ocean and for adults migrating back to their spawning grounds. There are many types of passage that can help the fish get past the dams, depending on factors such a dam’s age, size, location, and purpose. Sometimes passage facilities are added many years after a dam is built. These are the most common types of fish passages.10. Which system would be best suited for the movement of large quantities of adult salmon?(1 point)
Responses

Downstream System
Downstream System

Upstream System
Upstream System

Salmon Cannon
Salmon Cannon
Question 2
During downstream migration, some rivers can have thousands of young salmon making the trip to the ocean.

11. Which method of moving the salmon is more efficient of moving large quantities of young salmon downstream?

(1 point)
Responses

the salmon cannon, which needs to be loaded by hand
the salmon cannon, which needs to be loaded by hand

the downstream pipe system, which uses screens and flowing water to move the salmon
the downstream pipe system, which uses screens and flowing water to move the salmon

the upstream fish ladder, in which the adult fish swim/jump up each step to bypass a dam

Answer 1

Based on the information provided about salmon migration systems and the requirements for moving both adult and juvenile salmon, here are the answers to your questions:

Question 1: Which system would be best suited for the movement of large quantities of adult salmon?

• Upstream System

Adult salmon typically migrate upstream to reach their spawning grounds, making the upstream systems designed for their navigation most suitable for this purpose.

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Question 2: Which method of moving the salmon is more efficient for moving large quantities of young salmon downstream?

• the downstream pipe system, which uses screens and flowing water to move the salmon

The downstream pipe system is designed specifically to facilitate the movement of large numbers of juvenile salmon by utilizing screens and flowing water, making it more efficient than the salmon cannon or an upstream fish ladder.