A dauer is a worm in which development is halted at larval stage 3;the dauer is metabolically active but reproductively silent

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This is correct. A dauer is a special developmental stage in nematodes where they cease normal development and instead form a metabolically active, long-lived, and stress-resistant state. The dauer stage is typically reached in response to harsh environmental conditions, and dauer worms are reproductively arrested until conditions improve. In the laboratory, researchers can induce the formation of dauer larvae in nematodes as a way to study various aspects of developmental biology and physiology.

A Dauer Is a Worm in Which Development Is Halted