A jawless fish,which lays eggs in fresh water | vedclass

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(B) $Petromyzon$ (Lamprey) belongs to the Class $Cyclostomata$ of Phylum $Chordata$.It is a jawless fish that migrates from the ocean to fresh water t

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Petromyzon

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(B) $Petromyzon$ (Lamprey) belongs to the Class $Cyclostomata$ of Phylum $Chordata$.It is a jawless fish that migrates from the ocean to fresh water to lay eggs (anadromous migration).The eggs hatch in about $3$ weeks into minute,transparent larvae called ammocoetes.After metamorphosis,the young lampreys swim down to the sea,where they remain for $3$ or $4$ years before reaching maturity.Once they reach maturity,they migrate back to fresh water streams or rivers to spawn and then die.

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

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