The Korean Journal of Malacology (한국패류학회지)

The Malacological Society of Korea (한국패류학회)
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The study of stock assessment and management implications of the Manila clam, Ruditapes philippinarum in Taehwa river of Ulsan

울산 태화강 바지락의 자원평가 및 관리방안에 관한 연구

  • Choi, Young-Min (Fisheries Resources and Environment Division, East Sea Fisheries Research Institute of NFRDI) ;
  • Yoon, Sang-Chul (Fisheries Resources and Environment Division, East Sea Fisheries Research Institute of NFRDI) ;
  • Lee, Sung-Il (Fisheries Resources Management Division of NFRDI) ;
  • Kim, Jong-Bin (External Research Cooperation Division of NFRDI) ;
  • Yang, Jae-Hyeong (Fisheries Resources and Environment Division, East Sea Fisheries Research Institute of NFRDI) ;
  • Yoon, Byoung-Sun (Fisheries Resources and Environment Division, East Sea Fisheries Research Institute of NFRDI) ;
  • Park, Jeong-Ho (Fisheries Resources and Environment Division, East Sea Fisheries Research Institute of NFRDI)
  • 최영민 (국립수산과학원 동해수산연구소 자원환경과) ;
  • 윤상철 (국립수산과학원 동해수산연구소 자원환경과) ;
  • 이성일 (국립수산과학원 자원관리과) ;
  • 김종빈 (국립수산과학원 대외협력과) ;
  • 양재형 (국립수산과학원 동해수산연구소 자원환경과) ;
  • 윤병선 (국립수산과학원 동해수산연구소 자원환경과) ;
  • 박정호 (국립수산과학원 동해수산연구소 자원환경과)
  • Received : 2011.05.13
  • Accepted : 2011.06.05
  • Published : 2011.06.30
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Abstract

The manila clam (Ruditapes philippinarum) is mainly distributed in the coastal area which consist of mud, sand and gravel, but they rarely live on the upper and down reaches of river. For a long time the manila clam has been inhabited in Taehwa river which has been exploited as a traditional earning resources and has become as a major object by neighborhood fishermen. This study was undertaken to evaluate stock assessment and to build management implications with the ecological parameters in Taehwa river from June 2009 to June 2010. The maximum age of manila clam was determined to 6 years old from observing ring radius of shell, the length and weight relationship was TW = $0.0002SL^{3.063}$ ($R^2$ = 0.925). K and $L_{\infty}$ were respectively estimated 46.64 mm and 0.341/year by von Bertalanffy growth. The instantaneous total mortality was estimated to be 1.171/year and the age at first capture was 1.37 years by the Pauly's method using shell length composition. The current total biomass of manila clam was calculated 1,483 mt over study area $1.46\;km^2$ by swept area method. ABC (Acceptable Biological Catch) estimates of manila clam showed 512 mt with using $F_{0.1}$. It's desirable to determine the optimum harvesting time as after main spawning season, as well as it's required to manage fisheries resources considering capture age and biomass through adjusting a first age at capture.

바지락 (Ruditapes philippinarum) 은 모래와 진흙이 많은 연안에 주로 분포하지만 드물게 울산의 태화강처럼 하천의 중류나 하류에서도 분포한다. 울산 태화강에서는 예전부터 바지락이 서식해 왔으며 인근 어민들의 전통적인 소득원으로서 주요 수산자원의 대상이 되어 왔다. 본 연구는 2009년 6월부터 2010년 6월까지 바지락의 현장조사를 통하여 자원생태학적 특성, 자원량 및 적정어획량 등의 자원평가를 실시하고 지속가능한 자원관리의 방안 제시 및 어업정책 수립을 위한 기초자료를 확보하고자 하였다. 태화강 바지락의 수명은 6세로 추정되었고 von Bertalanffy growth function에 의하여 성장계수 K 및 $L_{\infty}$은 0.341 및 46.64 cm로 구해졌다. Pauly 방법에 의한 순간전사망계수 (Z) 및 어획개시연령 ($t_c$) 은 1.171/년과 1.37년으로 구해졌고 현재의 순간어획사망계수는 0.626/년으로 계산되었다. 바지락의 자원량은 총 서식면적 $1.46\;km^2$과 평균 면적당 생체량 1,005.3 g/$m^2$으로 1,483톤으로 추정되었다. 조사해역 바지락의 순간어획사망계수 (F) 에 대한 가입당생산량 (Y/R) 과 어획개시연령 ($t_c$) 과의 관계는 현재의 어획개시연령인 1.37세, 현재의 순간어획사망계수 F 에서 가입당생산량이 1.38 g임을 나타내고 있으며 적정어획사망계수 ($F_{0.1}$)에 의한 연간 생물학적 허용어획량 (ABC) 은 512톤으로 산정되었다.

Keywords

References

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