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

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Catching efficiency of biodegradable trammel net for swimming crab (Portunus trituberculatus) in the Yeonpyeong fishing ground of Korea

연평어장에서 생분해성 꽃게 삼중자망의 어획성능

  • Kim, In-Ok (Aquaculture Industry Division, West Sea Fisheries Research Institute, NFRDI) ;
  • Lee, Gun-Ho (Aquaculture Industry Division, West Sea Fisheries Research Institute, NFRDI) ;
  • Cho, Sam-Kwang (External Research Cooperation Division, National Fisheries Research & Development Institute) ;
  • Cha, Bong-Jin (Fisheries System Engineering Division, National Fisheries Research & Development Institute) ;
  • Sohn, Byung-Kyu (Resources Enhancement Division, East Sea Branch, Korea Fisheries Resources Agency)
  • 김인옥 (국립수산과학원 서해수산연구소 해역산업과) ;
  • 이건호 (국립수산과학원 서해수산연구소 해역산업과) ;
  • 조삼광 (국립수산과학원 대외협력과) ;
  • 차봉진 (국립수산과학원 시스템공학과) ;
  • 손병규 (한국수산자원관리공단 동해지사 자원조성실)
  • Received : 2012.07.30
  • Accepted : 2012.11.26
  • Published : 2012.11.30
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Abstract

To study the catching efficiency of biodegradable trammel net for swimming crab (Portunus trituberculatus), three types (biodegradable, monofilament and multifilament) of trammel nets were used in the field test, and the tests were carried out 16 times with two different mesh sizes (105mm and 160mm) in the Yeonpyeong fishing ground of Korea, 2009~2011. The catching efficiency of three type nets was analyzed by catch in number, catch in weight and average weight per individual of small and large size swimming crab by net types and mesh sizes. Statistical T-test was also carried out to verify the efficiency between the three types of nets. The results are as follows. The catch in number of swimming crab was 24,667 and formed about 81.0% of total catch. Of all swimming crab catch, small swimming crabs with less than 64mm in carapace length which is a prohibited landing size by law formed 48.1%, larger swimming crabs with more than 64mm in carapace length which is a landing size formed 51.9%. In 105mm mesh size trammel net test, the catch share in number of small size swimming crab by biodegradable trammel net was 47.5% in comparison with multifilament trammel net and 74.2% in comparison with monofilament trammel net, so biodegradable trammel net has more protective effects on small size swimming crab than other types of trammel nets. The protective effects for small size swimming crab by biodegradable trammel net was 25.8~52.5% in comparison with other types of trammel nets. The catch share in weight of large size swimming crab by biodegradable trammel net was 98.3% in comparison with multifilament trammel net and 92.3% in comparison with monofilament trammel net, so biodegradable trammel net has a similar catch efficiency to multifilament trammel net. The results of 160mm mesh size trammel net test have shown similar results of 105mm mesh size trammel net test. This study shows that biodegradable trammel net is a more useful fishing gear than multifilament and monofilament trammel net because biodegradable trammel net has lower catch rate than other types of nets in small size swimming crab and similar catch rate than multifilament trammel net which is a well used net by fishermen.

Keywords

Acknowledgement

Grant : 환경 수산자재 및 어구어법 개발

Supported by : 국립수산과학원

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