Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Fish Community Characteristics, and Habitat Characteristics and the Age of the Eight Barbel Loach, Lefua costata (Pisces: Namacheilidae) in the Jusucheon of Gangneung-si

강릉시 주수천의 어류군집 특징 및 쌀미꾸리 Lefua costata (Pisces: Namacheilidae)의 서식지 특징과 연령

  • Received : 2022.05.31
  • Accepted : 2022.07.25
  • Published : 2022.09.30
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Abstract

This study investigated the characteristics of fish communities, habitat characteristics and the age of Lefua costata in the Jusucheon of Gangneung-si, Korea from January to December 2013. The survey collected 23 species belonging to ten families from 6 survey stations. The dominant and subdominant species were Zacco koreanus (relative abundance, 22.1%) and Rhynchocypris steindachneri (20.1%), respectively. The next most abundant species were Tridentiger brevispinis (10.7%), Orthrias nudus (9.7%), Zacco platypus (8.6%), Lefua costata (7.9%), Iksookimia koreensis (6.0%) and Pungitius sinensis (3.0%). Among the fish species collected, one species, P. sinensis, was class II endangered wildlife by the Ministry of Environment, and four species (Z. koreanus, I. koreensis, Silurus microdorsalis and Cottus koreanus), were endemic to Korea. Additionally, five migration fish species (Tribolodon hakonensis, Hypomesus nipponensis, Gasterosteus aculeatus, Oncorhynchus keta and Plecoglossus altivelis) were collected. The similarity index based on species composition and numbers separated fish communites in the Jusucheon according to main section, i.e., uppermost(St. 1), upper (St. 2~4), middle (St. 5), lower (St. 6). Ecosystem health of Jusucheon Stream (fish assessement index) evaluated using fish was assessed as very good (5 stations) and good (1 station). The main inhabit of L. costata was the middle-lower stream of aquatic plants habitats with mud bottoms, very slow water velocity and water depth 40~80 cm. The age groups for L. costata (female) estimated by the frequency distribution of total length in the spawning season (May) indicated that the 24~37 mm is 1-year old, the 38~51 mm group is 2-year old, the 52~63 mm is 3-year old, 64~77 mm is 4-year old and the 80~91 mm is more than 5-year old. Finally, characteristics of fish communities, habitat characteristics and the age of Lefua costata in the Jusucheon was discussed.

강릉시 주수천의 어류군집 특징 및 쌀미꾸리의 서식지 특징과 연령을 밝히기 위해 2013년 1월부터 12월까지 조사를 실시하였다. 어류상 조사 결과 주수천은 10과 23종이 채집되었고, 우점종은 참갈겨니 Zacco koreanus (22.1%), 아우점종은 버들개 Rhynchocypris steindachneri (20.1%)였으며, 그 다음으로 민물검정망둑 Tridentiger brevispinis (10.7%), 대륙종개 Orthrias nudus (9.7%), 피라미 Zacco platypus (8.6%), 쌀미꾸리 Lefua costata (7.9%), 참종개 Iksookimia koreensis (6.0%), 가시고기 Pungitius sinensis (3.0%) 등의 순으로 우세하였다. 환경부지정 멸종위기 야생생물은 가시고기 1종이 채집되었고, 한국고유종은 참갈겨니, 참종개, 미유기 Silurus microdorsalis, 둑중개 Cottus koreanus 4종이, 회유성 어종은 황어 Tribolodon hakonensis, 빙어 Hypomesus nipponensis, 큰가시고기 Gasterosteus aculeatus, 연어 Oncorhynchus keta, 은어 Plecoglossus altivelis 5종이 채집되었다. 군집구조는 최상류(St. 1), 상류(St. 2~4), 중류(St. 5), 하류(St. 6)로 구분되었으며, 하천 건강성 평가는 매우좋음(5개 지점)과 좋음(1개 지점)으로 양호하였다. 쌀미꾸리의 주요 서식지는 하천 중·하류(St. 5~6)의 수초 지대로 하상이 펄로 이루어졌으며 수심 40~80 cm의 유속이 느린 정수역이었다. 또한 연령(암컷)을 전장빈도분포도로 추정한 결과, 산란이 시작되는 5월 기준 24~37 mm는 만 1년생, 38~51 mm는 만 2년생, 52~63 mm는 만 3년생, 64~77 mm는 만 4년생, 80~91 mm는 만 5년생 이상으로 추정되었다. 끝으로 주수천 어류군집 특징 및 쌀미꾸리의 서식지 특징과 연령 등에 대해 논의하였다.

Keywords

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