A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is
- Neomyxine
- Petromyzon
- Eptatretus
- Myxine
Answer
(2) Petromyzon
Solution
As per NCERT, cyclostomes (jawless vertebrates) are marine but migrate for spawning to fresh water; after spawning, within a few days, they die. Their larvae, after metamorphosis, return to the ocean. Examples: Petromyzon (Lamprey) and Myxine (Hagfish).
⇒ This anadromous life history with an ammocoetes larva is shown by the lamprey Petromyzon; hagfishes ( Myxine, Eptatretus, Neomyxine) live and breed in the sea and have direct development.
Answer: (2)