thermal mark

thermal mark
a ring in an otolith caused by a certain temperature regime during early incubation. Judicious use of temperature regimes and timing of them can cause a mark pattern specific to a hatchery and brood stock. The pattern will vary in the number and spacing of rings. The fish has to be killed later and the otolith extracted to retrieve the pattern and identify the fish

Dictionary of ichthyology. 2009.

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