Fisheries and Aquatic Sciences

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Evaluating stock status of shortfin mako (Isurus oxyrinchus) in southern Java and West Nusa Tenggara, Indonesia, using length-based approach

  • Umi Chodrijah (Fisheries Research Centre, National Research and Innovation Agency (BRIN)) ;
  • Tirtadanu (Fisheries Research Centre, National Research and Innovation Agency (BRIN)) ;
  • Bram Setyadji (Fisheries Research Centre, National Research and Innovation Agency (BRIN)) ;
  • Prihatiningsih (Fisheries Research Centre, National Research and Innovation Agency (BRIN)) ;
  • Dian Novianto (Fisheries Research Centre, National Research and Innovation Agency (BRIN)) ;
  • Fayakun Satria (Fisheries Research Centre, National Research and Innovation Agency (BRIN)) ;
  • Lilis Sadiyah (Fisheries Research Centre, National Research and Innovation Agency (BRIN)) ;
  • Ririk Kartika Sulistyaningsih (Fisheries Research Centre, National Research and Innovation Agency (BRIN)) ;
  • Hety Hartaty (Fisheries Research Centre, National Research and Innovation Agency (BRIN))
  • Received : 2024.01.17
  • Accepted : 2024.06.03
  • Published : 2024.08.31
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Abstract

The high economic value and demand for shark fin have significantly increased the vulnerability of the shortfin mako shark (Isurus oxyrinchus Rafinesque, 1810) population in the Indian Ocean, particularly in the southern region of Java and West Nusa Tenggara. This study utilized a length-based assessment method to evaluate the stock status of I. oxyrinchus. Over a span of eight years (2013-2021), data on length frequency and sex composition were collected. The length-based spawning potential ratio (SPR) was employed to investigate the stock status of the fishery. The findings revealed that I. oxyrinchus exhibited a large body size, with an asymptotic length estimated at 386.86 cm total length and a growth coefficient of 0.04/year . Females were more frequently captured than males, and evidence indicated a declining trend in the size of female sharks. A low SPR value of approximately 6% indicated the overfishing condition of mako shark. To ensure the sustainability of the shortfin mako shark population in the Indian Ocean, it is essential to develop effective management strategies through integrated cooperation among the government, fishers, traders, shark industries, and local communities.

Keywords

Acknowledgement

The authors thank the Research Institute for Marine Fisheries head, the Ministry of Marine Affairs, and the Fisheries Republic of Indonesia for facilitating this research. In addition, we thank all the staff in the Cilacap fisheries port and Tanjung Luar landing site for helping with the data collection process in this research. All authors contributed equally to constructing the paper.

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