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Characteristics of the Cetacean Bycatch in Korean Coastal Waters from 2011 to 2017

2011-2017년 국내 연안 고래류의 혼획 특성

  • Lee, Seulhee (Cetacean Research Institute, National Institute of Fisheries Science) ;
  • Choi, Seulgi (Cetacean Research Institute, National Institute of Fisheries Science) ;
  • Kim, Ji Hye (Cetacean Research Institute, National Institute of Fisheries Science) ;
  • Kim, Hyun Woo (Cetacean Research Institute, National Institute of Fisheries Science) ;
  • Sohn, Hawsun (Cetacean Research Institute, National Institute of Fisheries Science)
  • 이슬희 (국립수산과학원 고래연구센터) ;
  • 최슬기 (국립수산과학원 고래연구센터) ;
  • 김지혜 (국립수산과학원 고래연구센터) ;
  • 김현우 (국립수산과학원 고래연구센터) ;
  • 손호선 (국립수산과학원 고래연구센터)
  • Received : 2018.11.08
  • Accepted : 2018.12.02
  • Published : 2018.12.31

Abstract

Globally, the survival of many marine mammals is threatened by entanglement in fishing gear and there is also a high bycatch in Korea. This study analyzed the bycatch data of most cetacean species for Korean waters from 2011 to 2017, including the narrow-ridged finless porpoise Neophocaena asiaeorientalis, common dolphin Delphinus delphis, common minke whale Balaenoptera acutorostrata, and Pacific white-sided dolphin Lagenorhynchus obliquidens. A total of 12,262 cetaceans were captured as bycatch. In the Yellow and South Seas, the main species affected was the narrow-ridged finless porpoise, with 82.9% caught in stow nets and 11.5% captured in trawls. In the East Sea, the common minke whale, common dolphin, and Pacific white-sided dolphin were reported. The main common minke whale bycatch (43.5%) was in set nets, while common dolphins (49.0%) and Pacific white-sided dolphins (91.4%) were mainly caught in gill nets. The narrow-ridged finless porpoise, common dolphin, and common minke whale were most commonly reported in March, April, and May, while the Pacific white-sided dolphin was most frequently captured as bycatch in January and December. Each of these factors (season and gear responsible for bycatch) depended on the characteristics of the cetacean species. To conserve cetaceans, it is necessary to reduce the bycatch.

Keywords

Bycatch;Narrow-ridged finless porpoise;Common dolphin;Common minke whale;Pacific white-sided dolphin

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Fig. 1. Monthly variation in number of the bycatch cetacean by species in the Korean waters from 2011 to 2017. (a) Narrow-ridged finless porpoise Neophocaena asiaeorientalis, (b) Common dolphin Delphinus delphis, (C) Common minke whale Balaenoptera acutorostrata, (d) Pacific white-sided dolphin Lagenorhynchus obliquidens.

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Fig. 2. Locations of bycaught animals by species from 2011 to 2017. (a) Narrow-ridged finless porpoise Neophocaena asiaeorientalis, (b) Common dolphin Delphinus delphis, (C) Common minke whale Balaenoptera acutorostrata, (d) Pacific white-sided dolphin Lagenorhynchus obliquidens.

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Fig. 3. Proportion of bycatch fishing gears by species from 2011 to 2017. (a) Narrow-ridged finless porpoise Neophocaena asiaeorientalis, (b) Common dolphin Delphinus delphis, (C) Common minke whale Balaenoptera acutorostrata, (d) Pacific white-sided dolphin Lagenorhynchus obliquidens.

Table 1. Number and species of bycaught cetacean in Korean waters from 2011 to 2017

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Table 2. Bycaught number by species in each sea area

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Table 3. Number of bycaught cetacean species by fshing gear from 2011 to 2017

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Acknowledgement

Grant : 고래류 자원 및 생태조사

Supported by : 국립수산과학원

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