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Question
A jawless fish, which lays eggs in freshwater and whose ammocoete larvae after metamorphosis return to the ocean is
A jawless fish, which lays eggs in freshwater and whose ammocoete larvae after metamorphosis return to the ocean is
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Solution
The correct option is B Petromyzon
Petromyzon (Lamprey) belongs to the class-Cyclostomata of phylum-Chordata. It is a jawless fish which lays eggs in fresh water. The eggs hatch in about 3 weeks into minute transparent larvae called ammocoetes. The young lampreys, post metamorphosis, swim down to the sea, where they remain for 3 to 4 years before reaching maturity. They once again migrate to streams or rivers to spawn and die.
Petromyzon (Lamprey) belongs to the class-Cyclostomata of phylum-Chordata. It is a jawless fish which lays eggs in fresh water. The eggs hatch in about 3 weeks into minute transparent larvae called ammocoetes. The young lampreys, post metamorphosis, swim down to the sea, where they remain for 3 to 4 years before reaching maturity. They once again migrate to streams or rivers to spawn and die.
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