Which of the following types of migration is exhibited by eels?

Correct option is A

Correct Answer: (a) Catadromous
Explanation:
→ Eels (e.g., Anguilla spp.) are catadromous, meaning they migrate from freshwater to the sea for spawning.
→ Adults migrate to the Sargasso Sea to reproduce.
→ Larvae migrate back to freshwater as glass eels/elvers.
Information Booster:
→ Reverse of anadromy shown by salmon.
→ Longest known fish migration routes among freshwater species.
→ Sensitive to barriers such as dams and pollution.
Additional Information (Other Options):
(b) Potamodromous – migration within freshwater only.
(c) Anadromous – migrate from sea to freshwater.
(d) Local – short-distance movement only.