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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.

Keywords

Species composition;Length structures;the Han River Estuary;Freshwater fishes;Principal components analysis (PCA)

Acknowledgement

Grant : 하구 어장 실효성 평가 및 관리 전략 개발

Supported by : 국립수산과학원

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