Abstract
The article provides a detailed review of the marking methods of juvenile fish and discusses the mechanisms of the microstructure pike otoliths’ formation. The feasibility of thermal otolith marking of larvae and early juvenile fish with a short period of embryonic development is shown on the example of the common pike. The objectives of the study were to determine the most suitable age of pike juveniles for marking, and the optimal duration of temperature exposure. Three marking protocols were tested, in which the water temperature gradient was 7-12 °C, and the exposure time was 5, 6 and 10 hours, respectively. The pike larvae were marked at the age of 4 days and 11 days (after the start of the exogenous feeding) at least four times. The results of marking were evaluated on the first day and on the 10 th day after marking, as well as at later stages of development (in the age of 21-44 days). Most visible marks were noted in short heating cycles (5-6 hours) in larvae before the start of the exogenous feeding.
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