Salmon Life Cycle and Environmental Impact Quiz

What is the initial stage of a salmon's life cycle called?

• Fry

• Smolt

• Alevin

• Parr

What physiological change occurs when salmon transform into smolts?

• They lose their yolk sacs

• They grow larger fins

• They become silvery

• They develop stripes

How do salmon find their way back to their home river?

• By using ocean currents

• By following the sun

• By following other fish

• By detecting magnetic fields and smells

What do salmon primarily eat when they are in the ocean?

• Plankton

• Small fish

• Prawns

• Seaweed

What significant change occurs in male salmon during their return to rivers?

• They lose their fins

• They grow larger scales

• They develop a hook-like structure on their jaw

• They become more silvery

Why do salmon change color when they return to rivers?

• To blend in with the ocean

• To camouflage with river rocks

• To signal their readiness to spawn

• To attract mates

What is a key reason salmon are considered a keystone species?

• They are the largest fish in the river

• They provide nutrients to the ecosystem

• They are the only fish that migrate

• They live the longest

How does climate change affect salmon populations?

• It makes them more resistant to diseases

• It shortens their life cycle

• It increases their food supply

• It raises river temperatures and lowers water levels

What is a significant challenge for salmon due to climate change?

• More abundant food sources

• Increased predator numbers

• Longer migration routes

• Warmer river temperatures

What is one method to improve river habitats for salmon?

• Removing all vegetation

• Increasing fishing activities

• Building more dams

• Planting trees along riverbanks