Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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A study of bycatch characteristics of Pacific white-sided dolphins in Korean waters

한반도 연안의 낫돌고래 혼획 특성 연구

  • Kyum Joon PARK (Cetacean Research Institute, National Institute of Fisheries Science) ;
  • Min Ju KIM (Cetacean Research Institute, National Institute of Fisheries Science) ;
  • Mi-Kyung LEE (Cetacean Research Institute, National Institute of Fisheries Science) ;
  • Jong Hee LEE (Coastal Water Fisheries Research Division, National Institute of Fisheries Science)
  • 박겸준 (국립수산과학원 고래연구소) ;
  • 김민주 (국립수산과학원 고래연구소) ;
  • 이미경 (국립수산과학원 고래연구소) ;
  • 이종희 (국립수산과학원 연근해자원과)
  • Received : 2023.11.01
  • Accepted : 2023.11.27
  • Published : 2023.11.30
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Abstract

This study presents an analysis of bycatch data concerning Pacific white-sided dolphins (Lagenorhynchus obliquidens) along the Korean coast from 2016 to 2021. A total of 503 bycatches were examined, encompassing data on year, month, body length, sex, latitude (N), longitude (E), and fishing gear. Bycatch was the most frequent in waters with a longitude of less than 130°E, particularly in the southern coastal region at a latitude of 35.5°N, with a higher likelihood of bycatch in lower latitudes. Since 2017, a decreasing trend in bycatches has been observed. The sex distribution of bycaught dolphins showed a predominance of males (40%), followed by females (31%), with an unclassified category at 29%, though no statistically significant differences were found (p > 0.05). Seasonal analysis indicated that bycatch predominantly occurred during the winter months, with significant monthly variations (p < 0.01). Pacific white-sided dolphins were primarily ensnared in gill nets and, to a lesser extent, in stationary nets. Statistical analysis by gear type revealed a significant preference for gill nets (p < 0.001). Considering body length composition in relation to latitude, it is suggested that Pacific white-sided dolphins may utilize the southern waters of the East Sea as a potential nursery ground, though this was not confirmed at a significant level, emphasizing the need for further in-depth monitoring and ecological investigations. Given that there are approximately 27 different types of gill nets associated with the majority of bycatches, more detailed research is warranted to divide these gear types into finer subcategories for estimating bycatch relationships, ultimately leading to the development of effective conservation and management strategies.

Keywords

Acknowledgement

이 연구는 해양수산부 국립수산과학원 고래연구소(R2023004)의 지원으로 수행되었습니다. 혼획 자료 정리에 참여한 고래연구소 연구원들에게 감사드립니다.

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