Chordata: Protochordata to Amphibia · Zoology

What is the biological significance of the 'Mid-Atlantic Ridge' to the life cycle of the European Eel (Anguilla anguilla)?

  1. It is a permanent geographic barrier they cannot cross during migration
  2. It marks the location of their key offshore feeding grounds in the Atlantic
  3. It lies adjacent to the Sargasso Sea, where catadromous eels migrate to spawn
  4. It is where their larvae undergo metamorphosis into transparent glass elvers
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Correct answer: It lies adjacent to the Sargasso Sea, where catadromous eels migrate to spawn

European eels are catadromous, meaning they live in freshwater but migrate to the ocean (Sargasso Sea) to spawn. Their larvae then drift back to European coasts on the Gulf Stream.

Difficulty: Medium Question 18 of 20

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