Tentative application of computed tomography to study of otoliths and their responses to environment variations |
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Authors: | Li-na Yan Sheng-rong Li Jun-yan Luo Feng-qin Du Guo-lin Ma Yu-li Wang and Wu Wang |
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Affiliation: | (1) National Laboratory of Mineral Materials, China University of Geosciences, Beijing, 100083, China;(2) State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China;(3) Section of Radiation Diagnosis, China-Japan Friendship Hospital, Beijing, 100029, China |
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Abstract: | As the carrier of biomineral aragonite, fish otoliths memorize various messages of environment throughout the fish’s life.
In the past three decades, quite a few achievements have been made in the studies of fish otoliths, but no advances in research
using medical instruments have been reported. The authors tentatively applied X-ray computed tomography (CT) to the studies
of the internal structure of wild carp otoliths, with the CT value determined by variations in the sample density and element
composition. The wild carps were collected, respectively, from the Baiyangdian Shallow Lake in Hebei Province and Miyun Reservoir
in the Beijing metropolis, whose water environments are quite different. The former has suffered serious pollution and eutrophication,
whereas the latter has nearly experienced no pollution. The primary result indicates that differences exists in CT values
of otoliths for the carps from the above-mentioned waters. With in-depth studies, it is possible that X-ray computed tomography
could serve as a useful tool in the study of fish otoliths, and the CT values can be taken as typomorphic parameters to distinguish
the waters with different degrees of pollution. |
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Keywords: | carp otoliths X-ray computed tomography water environment Baiyangdian Shallow Lake Miyun Reservoir |
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