Salmon Biology and Adaptations

The video tutorial explores the external anatomy of fish, focusing on the role of mucus in protection and swimming. It describes various fins and their functions, and explains the differences between wild and hatchery salmon. The video also covers fish sensory organs, such as the lateral line and nares, and provides tips on identifying male and female salmon. Additionally, it discusses salmon adaptations for survival and their transition from freshwater to saltwater environments.

What is the primary function of mucus on a fish's body?

• To help the fish breathe underwater

• To make the fish more colorful

• To aid in swimming and provide protection

• To attract mates

Which fin is located closest to the fish's backbone?

• Pectoral fin

• Pelvic fin

• Dorsal fin

• Caudal fin

How can you distinguish between a wild salmon and a hatchery salmon?

• By the color of their scales

• By the presence of the adipose fin

• By their size

• By their swimming speed

What is the function of the lateral line in fish?

• To regulate body temperature

• To assist in breathing

• To detect movement and vibrations in the water

• To help fish see in the dark

How do salmon use their nares?

• To filter food

• To breathe underwater

• To smell the water

• To communicate with other fish

What is a key physical difference between male and female salmon during the spawner stage?

• Females have larger fins

• Males have a longer snout called a kite

• Females have brighter colors

• Males are generally smaller

Why do salmon have large families?

• To increase their food supply

• To attract more mates

• To ensure some survive to adulthood

• To dominate their habitat

What adaptation allows salmon to transition from freshwater to saltwater?

• Their kidneys and gills adjust to regulate salt

• Their scales change color

• They develop a thicker mucus layer

• They grow larger fins

What is the term for fish that can move from freshwater to saltwater?

• Pelagic

• Anadromous

• Benthic

• Catadromous

How do salmon camouflage themselves in the ocean?

• By swimming in large schools

• By hiding in coral reefs

• By having dark tops and silvery bellies

• By changing their color to match the ocean floor