What term is used for the opaque rings found on prepared otolith cross-sections that signify periods of fast growth?

Answer

Annuli

Annuli are the opaque rings observed under magnification when examining the cross-section of pollock otoliths; these rings represent seasons characterized by faster growth, typically warmer seasons.

What term is used for the opaque rings found on prepared otolith cross-sections that signify periods of fast growth?
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