Comparison of Salmon Migration Systems
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 their natal streams 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 infrastructure in use at and around 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
Question 1
10. Which system would be best suited for the movement large quantities of adult salmon?(1 point)
Responses
Downstream System
Downstream System
Upstream System
Upstream System
Salmon Cannon
Salmon Cannon
Question 2
11. During downstream migration, some rivers can have thousands of young salmon making the trip to the ocean. 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
Downstream pipe system which uses screens and flowing water to move the salmon
Downstream pipe system which uses screens and flowing water to move the salmon
Upstream fish ladder in which the adult fish swim/jump up each step to bypass a dam
7 answers
Question 2: The downstream pipe system, which uses screens and flowing water to move the salmon, is more efficient for moving large quantities of young salmon downstream.
Air
BIOTIC – Air
ABIOTIC – Air
Moss
BIOTIC – Moss
ABIOTIC – Moss
Water
BIOTIC – Water
ABIOTIC – Water
Woodpecker
BIOTIC – Woodpecker
ABIOTIC – Woodpecker
Soil
BIOTIC – Soil
ABIOTIC – Soil
Dead Willow Tree
BIOTIC – Dead Willow Tree
ABIOTIC – Dead Willow Tree
Moss - BIOTIC
Water - ABIOTIC
Woodpecker - BIOTIC
Soil - BIOTIC
Dead Willow Tree - BIOTIC
Removing trees from a forested area for the purpose of farming, building, or recreation
Fertilizers get washed into bodies of water causing algae to grow quickly
Purposeful or accidental introduction of non-native species into an area
Invasive Species Conservation Deforestation Nutrient Pollution
Removing trees from a forested area for the purpose of farming, building, or recreation - Deforestation
Fertilizers get washed into bodies of water causing algae to grow quickly - Nutrient Pollution
Purposeful or accidental introduction of non-native species into an area - Invasive Species