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 migrate back to the ocean.
• C
  After spawning,the adult lamprey stops feeding and migrates back to the ocean where it lives.
• D
  It is a sanguivorous ectoparasite on other fishes.