Alewives Migration and Fishway Mechanics

Jonathan Bird travels to the Pennamaquan River in Maine to witness the alewives' spawning run. He meets Chris Bartlett, who monitors the fish population and ensures their passage through fish ladders. The video highlights the challenges alewives face, the technology used to count them, and the efforts to restore their numbers. Jonathan also films underwater, capturing the alewives' journey.

What is the primary reason alewives migrate to the Pennamaquan River?

• To find food

• To escape predators

• To spawn

• To hibernate

What is the main challenge alewives face during their migration?

• Cold water temperatures

• Avoiding predators

• Navigating rapids

• Finding food

What role do fish ladders play in the migration of alewives?

• They provide food for the fish

• They increase water temperature

• They help fish bypass dams

• They protect fish from predators

What was the initial number of alewives counted after the fishway repairs?

• 245,000

• 500,000

• 100,000

• 70,000

How does the electronic fish counter work?

• It uses sound waves to detect fish

• It uses temperature sensors to detect fish

• It uses electrical conductance to count fish

• It uses cameras to count fish

What is the purpose of the wooden baffles in the fish ladder?

• To speed up the water flow

• To provide resting spots for fish

• To attract more fish

• To filter the water

What style of fishway is used in the Pennamaquan River?

• Vertical slot

• Denil

• Pool and weir

• Rock ramp

What was Jonathan's experience like in the river with the alewives?

• The fish ignored him

• The fish attacked him

• The fish were afraid of him

• The fish were curious about him

What is the water temperature Jonathan experienced in the river?

• 45°

• 58°

• 65°

• 72°

What is the main takeaway from the conservation efforts on the Pennamaquan River?

• Conservation is only effective in large rivers

• Small efforts can lead to significant improvements

• Conservation efforts have little impact

• Conservation efforts are too costly