Question

All the following statements are correct about Petromyzon (Lamprey) except

• A. Lampreys are marine and migrate for spawning into rivers (Anadromous)
• B. Their characteristic ammocoete larvae after metamorphosis migrates back to the ocean
• C. After spawning the adult lamprey stops feeding and migrates back to ocean where it lives
• D. It is a sanguivorous ectoparasite on other fishes

Answer 1

Answer: (C)

Features of Petromyzon (Lamprey) are:
- Petromyzon are marine fishes but they migrate to fresh water (rivers) for spawning. Such migration is anadromous migration.
- Petromyzon has ammocoete larva, which migrate from fresh water (river) to ocean.
- Petromyzon belong to class cyclostomata which are ectoparasite on some fishes.
- Petromyzon bear circular and suctorial mouth with sanguivorous feeding habit.