Redwood National and State Parks - Redwood Ranger Minute: Counting Salmon

The video explores the Redwood Creek estuary, highlighting the process of counting fish to estimate population sizes. Biologists use nets to capture fish, which are then tattooed for identification. This method helps estimate fish numbers using ratios, aiding in understanding the estuary's health as a fish habitat. The process involves capturing, sedating, tattooing, and releasing fish, with minimal harm to them. The video emphasizes the importance of these estimates for ecological health.

What is the main activity being conducted by the biologists at Redwood Creek?

• Counting fish

• Building a dam

• Planting trees

• Cleaning the creek

Which of the following fish species are the biologists focusing on during the counting process?

• Cutthroat trout and sticklebacks

• Trout and carp

• King salmon and steelhead

• Bass and catfish

What is the purpose of using a mild sedative on the fish during the counting process?

• To make them grow faster

• To calm them for easier handling

• To make them swim faster

• To change their color

Why are fish tattooed with blue dye during the counting process?

• To make them look attractive

• To track their migration patterns

• To identify them for future counting

• To mark them as endangered

How do biologists estimate the fish population in the estuary?

• By calculating the ratio of marked to unmarked fish

• By observing fish behavior

• By using a sonar device

• By counting all fish manually