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Natural mortality estimation and rational exploitation of purpleback flying squid Sthenoteuthis oualaniensis in the southern South China Sea

  • Aquaculture and Fisheries
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Abstract

Based on the biological data of purpleback flying squid (Sthenoteuthis oualaniensis) collected by light falling-net in the southern South China Sea (SCS) during September to October 2012 and March to April 2013, growth and mortality of ‘Medium’ and ‘Dwarf’ forms of squid are derived using the Powell-Wetherall, ELEFAN methods and length-converted catch curves (FiSAT package). Given a lack of commercial exploitation, we assume total mortality to be due entirely to natural mortality. We estimate these squid have fast growth, with growth coefficients (k) ranging from 1.42 to 2.39, and high natural mortality (M), with estimates ranging from 1.61 to 2.92. To sustainably exploit these squid stocks, yield per recruitment based on growth and natural mortality was determined using the Beverton-Holt dynamic pool model. We demonstrate squid stocks could sustain high fishing mortality and low ages at first capture, with an optimal fishing mortality >3.0, with the optimal age at first capture increased to 0.4–0.6 years when fishing mortality approached optimal levels. On the basis of our analyses and estimates of stock biomass, we believe considerable potential exists to expand the squid fishery into the open SCS, relieving fishing pressure on coastal waters.

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Acknowledgement

We are grateful to Dr. CHEN Yong for his help to complete the manuscript. We thank CHEN Sen, LI Jie, YAN Lei and YANG Bingzhong for their assistance in sample and data collection, and WANG Lianggen and LI Zengguang for their help in preparing figures. We thank to two anonymous reviewers for their comments and suggestions on the manuscript.

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Authors and Affiliations

  1. Guangdong Provincial Key Laboratory of Fishery Ecology and Environment, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, 510300, China

    Xuehui Wang  (王雪辉), Yongsong Qiu  (邱永松), Peng Zhang  (张鹏) & Feiyan Du  (杜飞雁)

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  1. Xuehui Wang  (王雪辉)
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  2. Yongsong Qiu  (邱永松)
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  3. Peng Zhang  (张鹏)
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  4. Feiyan Du  (杜飞雁)
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Corresponding author

Correspondence to Yongsong Qiu  (邱永松).

Additional information

Supported by the National Key Technology R&D Program (No. 2013BAD13B06) and the Guangdong Provincial Program of Science and Technology (No. 2014A020217011), while the survey cruises were funded by the State Oceanic Administration (No. GASI-02-SCS-YSW). The first author was also supported by a Special Fund for Youth Training from the South China Sea Fisheries Research Institute

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Wang, X., Qiu, Y., Zhang, P. et al. Natural mortality estimation and rational exploitation of purpleback flying squid Sthenoteuthis oualaniensis in the southern South China Sea. Chin. J. Ocean. Limnol. 35, 902–911 (2017). https://doi.org/10.1007/s00343-017-6115-4

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  • DOI: https://doi.org/10.1007/s00343-017-6115-4

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