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

Question

A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is (A) Neomyxine (B) Petromyzon (C) Eptatretus (D) Myxine.

Tardigrade Admin · Accepted Answer

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'.

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

Neomyxine

Petromyzon

Eptatretus

Myxine.

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'.