Sardine Migration and Ecology

Sardines live in large shoals and migrate due to ocean current shifts. This migration forms a mega-shoal and is the largest biomass migration on Earth. The exact reason for this migration is unknown, as it ends in unsuitable warm waters. However, the migration is crucial for the marine food web.

What triggers the sardines to start their migration?

• The presence of predators

• A change in water temperature

• A shift in ocean currents

• The availability of food

Where do the sardines form a mega-shoal?

• Near the coast

• On the Agulhas banks

• In warm water areas

• In the deep ocean

How long can the mega-shoal of sardines extend?

• 5 miles

• 10 miles

• 15 miles

• 20 miles

What is the significance of the sardine migration in terms of biomass?

• It is smaller than the Serengeti migration

• It is the largest biomass migration on the planet

• It is insignificant compared to other migrations

• It is the second largest migration

Why is the sardine migration considered a mystery?

• It only happens every few years

• It is caused by human activity

• It is a recent phenomenon

• It has no clear benefit to the sardines

What depends on the sardines completing their migration?

• An entire food web

• The growth of coral reefs

• The local fishing industry

• The weather patterns