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Biological observations on the crocodile shark Pseudocarcharias kamoharai

Authors

  • X. J. Dai,

    1. College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
    2. Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
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  • J. F. Zhu,

    Corresponding author
    1. College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
    2. Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
      Tel.: +86 21 61900319; email: jfzhu@shou.edu.cn
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  • X. J. Chen,

    1. College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
    2. Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
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  • L. X. Xu,

    1. College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
    2. Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
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  • Y. Chen

    1. Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
    2. School of Marine Sciences, University of Maine, Orono, ME 04469, U.S.A.
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Tel.: +86 21 61900319; email: jfzhu@shou.edu.cn

Abstract

Sex ratios and gravid characteristics were analysed for the crocodile shark Pseudocarcharias kamoharai from the tropical eastern Pacific Ocean. Gravid females ranged from 80 to 102 cm fork length (LF). The mode litter size was four (two embryos per uterus), mean embryo length was linearly correlated with maternal length (r = 0·465, n = 32); there was no significant difference in LF between female and male embryos.

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