A jawless fish, which is marine but migrate for spawing to freshwater and whose ammocoetes larvae after metamorphosis return to the ocean is: A. Icthyophis B. Catla C. Pristis D. Petromyzon
Option D. 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.
