Effects of Dams on Migratory Fish

Which types of fish migration are mentioned in the topic description as being affected by dams?

• Anadromous and catadromous

• Potamodromous and oceanodromous

• Amphidromous and hemidromous

• Anadromous, catadromous, and potamodromous

How is the topic of dams and migratory fish connected to fisheries science?

• It is related to the culinary preferences for different fish species.

• It is connected through the impact on recreational fishing activities.

• It is connected due to the impact on water quality and fish population management.

• It is related to the development of new fish species through genetic engineering.

What is the main impact(s) of dams on fish populations that we addressed today?

• Dams help fish in spawning more effectively.

• Dams have no significant impact on fish populations.

• Dams negatively impact the ability of fish species to migrate and spawn, leading to possible overabundance of prey species and poor nutrient distribution through sediments.

• Dams increase the nutrient distribution in streams, benefiting fish populations.

What is one way that fish can bypass dams to continue their migration?

• Dams removal

• Underwater tunnels

• Fish ladders

• Fish elevators

From our presentation, besides generating hydroelectric power, what are some benefits dams provide?

• 1. Providing water for various uses (domestic, agricultural, industrial)

• 1. Flood control and prevention

• Both A and B

• 1. None of the above

The main reason dams are built on rivers and streams is to...

• 1. Generate electricity

• Control the flow of water

• 1. Provide drinking water for homes

• 1. All of the above

There has been an 801% increase in stream/river fragmentation. What is the main consequence of this fragmentation for migratory fish populations?

• It increases the water temperature.

• It disrupts their natural migration patterns.

• It reduces the overall amount of water in the rivers.

• It introduces harmful nutrients into the water.

Dams can change water temperatures and flows. How do these changes in water flow specifically impact migrating fish?

• They introduce new predators into the rivers.

• They decrease the oxygen levels in the water.

• They make it harder for fish to find food.

• They disorient the fish and make it difficult to navigate.

Dams can also cause nutrient deprivation. How might this nutrient deprivation affect the overall health of migratory fish populations?

• It makes them more susceptible to diseases.

• It increases their swimming speed and agility.

• It helps them grow larger and healthier.

• It attracts more food sources for the fish.