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Chinese Journal of Applied Ecology ›› 2020, Vol. 31 ›› Issue (8): 2775-2784.doi: 10.13287/j.1001-9332.202008.033

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Beak morphological and growth characteristic of Sthenoteuthis oualaniensis in the northwest Indian Ocean in winter and spring

HE Jing-ru1, LU Hua-jie1,2,3,4,5,6*, CHEN Xuan-yu1, LIU Kai1, WANG Hong-hao1, CHEN Xin-jun1,2,3,4,5,6   

  1. 1College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;
    2Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, Shandong, China;
    3National Distant-water Fisheries Engineering Research Center, Shanghai 201306, China;
    4Ministry of Education Key Laboratory of Sustainable Exploitation of Oceanic Fishe-ries Resources, Shanghai Ocean University, Shanghai 201306, China;
    5Key Laboratory of Oceanic Fisheries Exploration, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China;
    6Scientific Observing and Experimental Station of Oceanic Fishery Resources, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China
  • Received:2019-11-29 Revised:2020-05-08 Online:2020-08-15 Published:2021-02-15
  • Supported by:
    This work was supported by the National Key R&D Program of China (2019YFD0901404, 2019YFD090402), National Natural Science Foundation of China (41506184, 41876141), and Key R&D Project of Science and Technology Department of Zhejiang Province (2018C02026).

Abstract: Beak is one of the most important hard tissues of cephalopods, and thus is widely used in the study of cephalopod fisheries ecology and fishery resource assessment. With 1009 Sthenoteuthis oualaniensis samples collected by Chinese light falling-net fishery during February to May in the northwest Indian Ocean, we examined the morphologic and growth characteristics of beak. Results of the principal component analysis showed that the upper hood length (UHL), the upper crest length (UCL), the upper lateral wall length (ULWL), the lower crest length (LCL), the lower wing length (LWL) and the lower lateral wall length (LLWL) could be used as the morphological cha-racteristic parameters to examine the morphological changes of the beak. Results of the analysis of covariance (ANCOVA) showed that there were significant differences in the relationships between all of the morphological characteristic parameters and mantel length (ML) for males and females except UCL. There were significant differences in the relationships between all of the morphological characteristic parameters and body weight (BW) for males and females. The relationships between LCL, UCL and ML were optimally described by the linear functions. Power functions were best for UHL, LWL and linear functions were best for ULWL, LLWL for females. The relationships between ULWL and ML were optimally described by power functions, while the logarithm functions were best for UHL, LLWL and LWL for males. The relationships between all of the morphological characteristic parameters and BW were optimally described by the power functions for females, while the logarithm functions for males except the power function for ULWL. Our results provided scientific basis for the research of the fisheries ecology and stock assessment for S. oualaniensis.

Key words: Sthenoeuthis oualaniensis, beak, morphology, growth, northwest Indian Ocean