false annulus
1) an area of slow growth that is not counted as an annulus on scales, usually due to an unseasonal lack of food, high temperatures or reduced oxygen levels. The circuli become closely packed rapidly rather than gradually
2) a check ring on scales or otoliths which occurs before the first annulus and fairly close to the focus (scales) or nucleus (otoliths)

Dictionary of ichthyology. 2009.

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