A marine jawless fish, which lays eggs in fresh water and whose larvae after metamorphosis return to the ocean is :

Petromyzon

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Eptatretus

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Myxine

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Neomyxine

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Solution

The correct option is A Petromyzon
Cyclostomata is a group of agnathans that comprises the living jawless fishes.
Cyclostomes 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).

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A jawless fish, which lays eggs in freshwater and whose ammocoetes larvae after metamorphosis return to the ocean is?

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