Проблема определения возраста сеголетков балтийского шпрота по суточным приростам на отолитах
Surfaces of the otolith sections in the 0-group Baltic sprat have been examined using scanning electron microscope (SEM). The otolith's surface was etched by 1% HC1, washed in water, dried in air. As a result of these procedures, it obtained a relief. Coated with a gold layer, the samples were examined in SEM with accelerating voltage of 15 kV. Primordium, nucleus, and daily growth increments have been marked in the otoliths examined. Two layers with different structures have been distinguished. To compare the results, calculations and the width measurements should be made on the cross-sections through the otolith's nucleus. The system of automatic image analysis has been used. Quasi-periodical functions describing periodicity in the otolith growth, are mostly formed by low-frequency spectrae. A method has been developed for relative age determinations in the 0-group Baltic sprat using SEM and the system of automatic system analysis. To define absolute fish age, additional investigations should be carried out on the sprat otoliths at larval stage.
| Main Authors: | , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Russian |
| Published: |
1988
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| Subjects: | Baltic sprat, Scanning electron microscope, Otoliths microstructure, ASFA_2015::A::Age determination, ASFA_2015::F::Fish larvae, ASFA_2015::O::Otoliths, ASFA_2015::E::Electron microscopes, |
| Online Access: | http://hdl.handle.net/1834/10323 |
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