보령 대천천의 어류상과 어류 군집 특성

Characteristics of Fish Fauna and Community Structure in Daecheon Stream in Boryeong, Korea

  • 송미영 (국립수산과학원 중앙내수면연구소) ;
  • 정승윤 (국립수산과학원 중앙내수면연구소) ;
  • 김경환 (국립수산과학원 중앙내수면연구소) ;
  • 백재민 (국립수산과학원 중앙내수면연구소) ;
  • 이완옥 (국립수산과학원 중앙내수면연구소)
  • 투고 : 2013.07.12
  • 심사 : 2013.08.31
  • 발행 : 2013.08.31

초록

하천에 설치된 인공구조물이 어류군집의 분포에 미치는 영향을 파악하기 위하여, 2012년 4월부터 10월까지 서해로 유입되는 독립하천인 대천천에 서식하는 어류상을 조사하였다. 본 연구에서 확인된 어류는 총 13과 42종이었으며, 개체수에 있어서 우점종은 Zacco platypus(32.3%)와 Tridentiger brevispinis(12.8%)가 우점하였고, 생체량에 있어서는 Z. platypus(27.7%)와 Chelon haematocheilus(11.9%)가 풍부하였다. 한국고유종은 8종(19.9%), 법적보호종인 Rhodeus pseudosericeus, 회유성어종인 Anguilla japonica, 외래도입종인 Carassius cuvieri와 Micropterus salmoides 가 출현하였다. 우점종인 Z. platypus 개체군의 전장-체중의 관계식에 의한 회귀계수 b값은 3.21~3.29, 비만도지수는 평균 0.89로 비교적 양호한 성장도를 유지하고 있었다. 유사도분석을 통한 대천천의 어류군집은 청천저수지 상류구간(St. 1), 성업사보 하류구간(St. 5)과 St. 2~4 구간의 세 그룹으로 나뉘어졌으며, 조사지점별 우점종은 Zacco koreanus(St. 1), Z. platypus(St. 2~4), T. brevispinis(St. 5) 등 이었다. 대천천의 어류군집은 하천에 설치된 인공구조물인 저수지와 보에 의해 뚜렷하게 나뉘어졌다.

The ichthyofauna and fish community were studied in Daecheon Stream from April to October 2012. During the survey period a total of 42 species belonging to 13 families were collected. Dominant species by number was Zacco platypus(32.3%) and Tridentiger brevispinis(12.8%). In biomass, the dominant species was Z. platypus(27.7%) and Chelon haematocheilus(11.9%). Also, eight Korean endemic fish species and one endangered species (Rhodeus pseudosericeus) were collected. In addition, two exotic species(Carassius cuvieri and Micropterus salmoides) and migration fish species(Anguila japonica) were observed. Based on the length-weight relationship of Z. platypus, the b value was 3.21~3.29, and the condition factor(K) was 0.89 on average with stable condition. According to similarity analysis, fish communities in Daecheon Stream were divided into three groups; the upper reaches near a reservoir(St. 1), the middle reaches (St. 2 to 4) and the lower reaches near a weir(St. 5). Dominant species at each group were Zacco koreanus(St. 1), Z. platypus(St. 2 to 4) and T. brevispinis(St. 5). This result suggested that artificial structures such as dam and a weir have a marked effect on the distribution of fish communities in Daecheon Stream.

키워드

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