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

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

AIPMTAIPMT 2015Animal Kingdom

Solution:

Petromyzon are marine but migrate for spawning to fresh water. After spawning, within a few days, they die. Their ammocoete larvae, after metamorphosis, return to the ocean. So, the correct option is 'Petromyzon'.