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Seasonal variations in species composition by the stow nets and the stow net on boat fisheries in the Han River Estuary, Korea

한강 하구 해역에서 개량안강망 및 해선망으로 어획된 수산생물의 계절별 종 조성

  • Oh, Taeg Yun (Fisheries Resources Research Division, National Fisheries Research & Development Institute) ;
  • Lee, Jae Bong (Dokdo Fisheries Research Center, ESFRI) ;
  • Seo, Young Il (Fisheries Resources Research Division, National Fisheries Research & Development Institute) ;
  • Lee, Jong Hee (Fisheries Resources Research Division, National Fisheries Research & Development Institute) ;
  • Choi, Jung Hwa (Fisheries Resources Research Division, National Fisheries Research & Development Institute) ;
  • Kim, Jung Yun (Fisheries Resources Research Division, National Fisheries Research & Development Institute) ;
  • Lee, Dong Woo (Fisheries Resources Research Division, National Fisheries Research & Development Institute)
  • 오택윤 (국립수산과학원 자원관리과) ;
  • 이재봉 (동해수산연구소 독도수산연구센터) ;
  • 서영일 (국립수산과학원 자원관리과) ;
  • 이종희 (국립수산과학원 자원관리과) ;
  • 최정화 (국립수산과학원 자원관리과) ;
  • 김정윤 (국립수산과학원 자원관리과) ;
  • 이동우 (국립수산과학원 자원관리과)
  • Received : 2012.09.20
  • Accepted : 2012.11.16
  • Published : 2012.11.30

Abstract

Marine organisms were collected by the stow nets and the stow net on boat fisheries from April 2010 to November 2011 in the Han River Estuary and categorized as 126 species, 61 families, and 5 taxa. The species were consisted with 34 in Crustacea, 5 in Cephalopoda, 79 in Pisces, unidentified jellyfishes in Cnidaria, and Finless porpoise in Mammals. The major species were composed of fish and crustaceans in the Han River Estuary. The dominant species in Crustacea were Chinese ditch prawn (Palaemon gravieri), blue crab (Portunus trituberculatus), Ridgetail prawn (Exopalaemon carinicauda), and mantis crab (Oratosquilla oratoria), and those in Pisces were Korean anchovy (Coilia nasus), and Japanese grenadier anchovy (Coilia mystus). The length structures of the six dominant species have more than one mode in the Han River Estuary. It reflects that the species inhibit during a part of and/or whole lifetime in the Han River Estuary where they utilize as spawning and/or nursery grounds. Freshwater fishes were collected from station D where is the closest location to the Han River stream, and their appearances were well matched with the large amount of freshwater discharge due to flood periods. Principal components analysis (PCA) was carried out with species compositions and showed temporal and spatial differences by the variations of species.

한강 하구 해역에서 2010년 4월부터 2011년 11월까지 총 9회에 걸쳐 출현한 생물은 5 분류군 61과 126종이었다. 갑각류는 18과 34종, 두족류는 3과 5종, 어류는 35과 79종으로 분류되었으며, 그 외 종단위로 분류되지 않은 자포동물류인 해파리류와 포유류에 속하는 상괭이가 출현하였다. 한강 하구 해역의 출현종의 대부분은 어류와 갑각류로 구성되었다. 연구기간동안 주된 우점 종은 그라비새우, 꽃게, 밀새우, 갯가재 등이었으며, 어류로는 웅어와 싱어이었다. 우점한 6종에 대한 체장조성 및 평균체장을 살펴보면, 하나 이상의 체장모드를 가지는 것으로 나타났다. 하나 이상의 모드를 가지는 것은 한강 해역에 출현하는 종들이 일정시기 또는 일생동안 한강 하구 해역에서 서식하며, 산란장 또는 성육장으로 이용하고 있다는 것을 반영한다. 한강 하구 해역중 강과 가장 가까운 정점인 더리미에서는 민물어류가 출현하였으며, 홍수 등 담수의 대량 방류 시기와 조사 시기가 일치하는 경우에 민물어류가 하구 해역에서 채집되는 것으로 생각된다. 연도별 정점별 종조성을 이용하여 주성분분석을 실시하였다. 그 결과 종조성은 조사시기별 정점별 차이를 나타내었다.

Keywords

Acknowledgement

Grant : 하구 어장 실효성 평가 및 관리 전략 개발

Supported by : 국립수산과학원

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