Migratory Fish and Their Ecosystems

The video explores the migration patterns of fishes between freshwater and the sea, focusing on two main types: patamodrome and talasodrome. It discusses their habitats, diets, and reproduction cycles, highlighting their ecological roles and cultural significance. The video also emphasizes the importance of these species in maintaining ecological balance and their symbolic value in various cultures.

What is the primary reason migrating fishes need to migrate at specific times and stages in their life cycle?

• To escape harsh weather

• To complete their vital cycle

• To find food

• To avoid predators

Which of the following is a characteristic of patamodrome species?

• They reproduce in the sea

• They grow in freshwater and migrate to the sea

• They do not migrate

• They only live in freshwater

Where do talasodrome species typically reproduce?

• In rivers

• In estuaries

• In the sea

• In lakes

Which species is known for migrating to the Sargasso Sea to reproduce?

• Eel

• Sea trout

• Atlantic salmon

• Blue back herring

What is a common diet for lamprey larvae during their growth in freshwater?

• Algae

• Diatoms

• Plankton

• Small fish

Which species can reproduce only once before dying?

• Atlantic salmon

• Trade shad

• Lamprey

• Mullet

In which region is the lamprey particularly famous for its culinary use?

• Bordeaux

• British Columbia

• Normandy

• Quebec

What role do migrating fishes play in ecosystems?

• They are primary producers

• They are keystone species

• They are decomposers

• They are pollinators

Which animal is known to feed on eels in the San Juan River?

• Bears

• Birds

• Seals

• Whales

How do migrating fishes contribute to the nutrient cycle in river ecosystems?

• By decomposing and enriching the soil

• By consuming algae

• By providing shelter for other species

• By cleaning the water