Analyses of egg size, otolith shape, and growth revealed two components of small yellow croaker in Haizhou Bay spawning stock

  • Yiqian Jiang
  • Chi Zhang
  • Zhenjiang Ye
  • Yongjun TianEmail author


The geographical variations in life history characteristics of small yellow croaker Larimichthys polyactis, caused by experienced diff erent environmental conditions, have been observed in China seas. Previous studies based on spatial distribution, migration route, and body morphometrics suggested a complex stock structure. In this study, to clarify the source of a spawning stock, we investigated the reproduction strategy and inter-structure of the Haizhou Bay (HZB) spawning stock in the middle Yellow Sea from both egg survey and adult otolith increment analysis. Egg and adult samples were collected from three surveys during spawning season in 2013. Distinct spatial and temporal variations were detected in egg distribution and size, and otolith shape analysis of adult fi shes revealed two morphotypes with diff erent increment growth using random forest cluster. The results indicate the existence of two components within the same spawning stock in HZB from diff erent wintering grounds, and accordingly special protection should be required for this stock given the signifi cance to maintain connectivity between adjacent subpopulations.

Key word

small yellow croaker otolith shape otolith increment egg random forest 


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We also thank all of the undergraduates and fi shermen involving in this work for their assistance in sample collection.


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Copyright information

© Chinese Society for Oceanology and Limnology, Science Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yiqian Jiang
    • 1
  • Chi Zhang
    • 1
  • Zhenjiang Ye
    • 1
  • Yongjun Tian
    • 1
    • 2
    Email author
  1. 1.Fisheries CollegeOcean University of ChinaQingdaoChina
  2. 2.Laboratory for Marine Fisheries Science and Food Production ProcessesPilot National Laboratory for Marine Science and TechnologyAoshanwei, QingdaoChina

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