Working Group on Salmon Marking
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Bands, Circuli, Hatch Marks, and Rings

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1. Band A distinct group of dark rings created by thermal marking procedures. Multiple bands are separated from each other by a space that is significantly greater those that occur between rings. Also see Thermal Mark.
2. Circuli Concentric, continuous lines representative of incremental growth patterns present on scales and otoliths.
3. Hatch Mark A circulus present on an otolith that is generated when fry emerge from their egg cases. The clarity of the mark varies within and among species.
4. Ring An individual dark circulus generated by thermal marking procedures.

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