Question

Parents of ammocaete larva show

• A. Placoid sclaes
• B. Paired fins
• C. Catadromous migration
• D. Anadromous migration

Answer 1

Answer: (D)

• An anadromous fish is the fish that is born in freshwater, spends most of its life in the sea and returns to freshwater to spawn. For example, Salmon, smelt shad, striped bass.
• Catadromous fish spend most of their lives in freshwater, then migrate to the sea to breed. For example, American eel, European eel, inanga, shortfin eel, longfin eel.
• Ammocoete is the larval stage of the primitive lamprey. For breeding, lamprey migrates upstream in rivers. Males make a nest in sand and gravel in which females lays eggs and males fertilizes them.
• In about 3 weeks, eggs hatch into ammocoete larva that lies buried in sand and feeds on detritus. The fully-grown larvae go downstream and enter the sea.

Thus, the correct answer is option D.