Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Fish fauna and characteristics of Carassius auratus population in the Boryeong Reservoir

보령호의 어류상 및 붕어 개체군 특성

  • Choi, Won Sub (Department of Biological Science, College of Science & Engineering, Sangji University) ;
  • Han, Jung Soo (Department of Biological Science, College of Science & Engineering, Sangji University) ;
  • Choi, Jun Kil (Department of Biological Science, College of Science & Engineering, Sangji University) ;
  • Lee, Hwang Goo (Department of Biological Science, College of Science & Engineering, Sangji University)
  • Received : 2020.11.05
  • Accepted : 2020.12.22
  • Published : 2020.12.31
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Abstract

This study was conducted to investigate the fish fauna and characteristics of the Carassius auratus population in the Boryeong Reservoir in Chungcheongnam-do from October 2017 to June 2018. The collected fish were identified as 3,506 individuals of 15 species from a total of nine families. The dominant and subdominant species were H. nipponensis with 1,706 (48.6%) individuals and C. auratus with 1,021 (29.1%) individuals, respectively. The biomass of C. auratus (246,130g), P. fulvidraco(50,610g), C. cuvieri (14,730 g), S. asotus (11,560 g), and C. carpio (10,930 g) was analyzed. The results of the community analysis showed a dominant index value of 0.87 (±0.2), a diversity index value of 0.78 (±0.5), an evenness index value of 0.47 (±0.2), and a richness index value of 0.99 (±0.5). The length-weight analysis of C. auratus showed a regression coefficient b of 3.06, and a condition factor (K) of 0.0004 with a positive slope. The frequency distribution of the total length analysis of the C. auratus population inhabiting the Boryeong Reservoir showed a high distribution of lengths between 140-160 mm and a low distribution between 230-280 mm. The normalized difference water index (NDWI) was analyzed over the Boryeong Reservoir water surface from 2013 to 2014 using Landsat 8 channel data. The areas where the NDWI was decreased were located at the inflow site of Ungcheon Stream.

본 연구는 충청남도 보령시에 위치한 보령호를 대상으로 어류상 및 붕어 개체군의 특성을 파악하고자 2017년 10월부터 2018년 6월까지 조사를 실시하였다. 어류상 조사결과, 총 9과 15종 3,506개체가 출현하였으며, 한국고유종은 얼룩동사리 1종(6.6%), 외래종 및 생태계교란종은 떡붕어, 배스 2종(13.3%)이 조사되었다. 상대풍부도 분석결과, 빙어 1,706개체(48.6%), 붕어 1,021개체(29.1%)로 각각 우점, 아우점하고 있는 것으로 나타났다. 생체량 분석결과 붕어가 246,130 g으로 가장 높은 생체량을 보였으며, 동자개 50,610 g, 떡붕어 14,730 g, 메기 11,560 g, 잉어 10,930 g의 순으로 분석되었다. 군집분석 결과 우점도지수 0.87 (±0.2), 다양도지수 0.78 (±0.5), 균등도지수 0.47 (±0.2), 풍부도지수 0.99 (±0.5)로 분석되었다. 붕어 개체군의 전장 - 체중 상관관계 분석결과 회귀계수 b값은 3.06으로 나타났으며, 비만도 지수(K) 기울기는 양의 기울기로 분석되었다. 전장빈도분포 분석결과, 당년생은 출현하지 않았으며, 2년생으로 추정되는 170~190 mm 개체는 다수 출현하였고, 4~5년생으로 추정되는 230~280mm 개체는 낮은 출현을 나타내었다. 보령호의 저수량 추이를 확인하기 위해 연평균저수량과 NDWI 분석을 실시한 결과, 2013년에서 2014년에 급격한 연평균 저수량 변화를 나타내었으며, 웅천천이 유입되는 St. 4에서 수위변동에 영향을 받는 것으로 추정되었다.

Keywords

Acknowledgement

본 연구는 상지대학교 대학원 및 보령호 내수면어업 관련 자원량 조사 연구용역(과제번호: 210700770002)의 지원을 받아 시행되었습니다.

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