(F) Hydroelectric dams

Question 1

Effects of Dams on Habitat and Wildlife

Answer 1

Habitat:
- Destruction/alteration during construction and use
- Sediment movement

Wildlife:
- Migratory pathway blockage
- Direct damage to wildlife

Question 2

Aeration

Answer 2

• Excess air can saturate into pressurized/deeper water
• Water that moves to the surface is supersaturated and starts degassing
• Excess air can be absorbed into the fish during gas exchange
• Extra gas in the bloodstream can cause numerous effects on fish usually lumped together as GAS BUBBLE TRAUMA (GBT)

Question 3

How can fish somewhat avoid the effects of high TDG exposure?

Answer 3

by swimming deeper

Question 4

What are 3 symptoms of gas bubble trauma?

Answer 4

1. Lesions across body
2. Eczema
3. Overinflated swim bladders