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Issue:ISSN 1000-7083
          CN 51-1193/Q
Director:Sichuan Association for Science and Technology
Sponsored by:Sichuan Society of Zoologists; Chengdu Giant Panda Breeding Research Foundation; Sichuan Association of Wildlife Conservation; Sichuan University
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Otolith microstructure character analysis between wild-caught and hatchery-breeding Myxocyprinus asiaticus
Author of the article:LEI Yi, ZHOU Yu, YANG Kun, WU Jiayun, ZHANG Xi
Author's Workplace:四川大学生命科学学院
Key Words:Myxocyprinus asiaticus; wild-caught; hatchery-breeding; otolith microstructure; stock identification
Abstract:The otolith microstructure of Myxocyprinus asiaticus sampled from hatchery and wild were examined and analyzed. The lapilli of M. asiaticus could be divided into optically dense and low optically dense zones based on the difference of transparence. The otoliths, which has the distinct boundary between the optically dense and low optically dense zones, accounted for 63.16% in hatchery-breeding population and this character is only 14.81% in wild-caught population. The size of low optically dense zones in otolith of the wild-caught and hatchery-breeding M. asiaticus is 0.17±0.03mm and 0.14±0.06mm, respectively. Otolith nucleus diameter of the hatchery- and wild-population is 13.10±1.87μm and 11.14±1.74μm, respectively, and the primordium is 1 and 1-2, respectively. The number of checks is 1-3, and the width of the daily increment is 2.14±0.59μm in otolith of the hatchery-breeding M. asiaticus. However, otoliths of the wild-caught M. asiaticus shaped 1-7 checks and the width of the daily increment is 2.54±1.12μm. Otoliths of the hatchery-breeding M. asiaticus have more regular and smaller fluctuant width of the daily increment than wild-captured individuals. The result of the clustering analysis for the daily increment indicated that the 94.59% otoliths of the hatchery-breeding M. asiaticus reached the same cluster at the 2.5 for the Euclidean distance. The result of the clustering analysis is consistent with microstructure examined. The otolith microstructure of the hatchery and wild individual has remarkable distinction, such as the different forms of the optically dense and low optically dense zones, the width of the daily increment and the number of the check. The difference of otolith microstructure could be used to discriminate between the reared and wild population in the fish.
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