Reports

Fish Otoliths: Daily Growth Layers and Periodical Patterns

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Science  17 Sep 1971:
Vol. 173, Issue 4002, pp. 1124-1127
DOI: 10.1126/science.173.4002.1124

Abstract

The early-stage annual rings in otoliths from some cold-temperate fish consist of thin growth bands, the number of which corresponds to that of the days in a year. This indicates that growth takes place by daily increments. Other recurrent patterns show a fortnightly and monthly periodicity. Spawning rings are microscopically distinguishable from winter rings.