멸종위기어류 미호종개 Cobitis choii (Pisces: Cobitidae)의 서식지 특징과 연령추정 = Habitat Characteristics and Estimation of the Age of the Endangered Miho Spine Loach, Cobitis choii (Pisces: Cobitidae) in Ji Stream, Guem River, Korea

다국어 초록 (Multilingual Abstract)

The habitat characteristics and the age of endangered miho spine loach, Cobitis choii, were investigated in Ji Stream, Guem River, Korea in 2011 to provide baseline data for its restoration. The habitat of the C. choii was the downstream portion composed of sand, and the sand particle sizes was mostly 0.21~1.18 mm (88.7%). Juveniles (age 0+) preferred slower water velocity (0~25 cm/sec) and a lower water depth (5~20 cm) than did individuals who were more than 1 year old, as this group inhabited rapids with 10~25 cm/sec of water velocity and 20~50 cm of water depth. The C. choii rapidly grew during the active period from April to October and they stopped growing during the hibernating period from November to March. The estimated age of the C. choii (females) based on their total length distribution during the spawning period (June) indicated that 1-, 2-, 3- and more than 4-year-old were 40~61 mm, 64~79 mm, 80~91 mm and 92~106 mm, respectively.

국문 초록 (Abstract)

멸종위기어류인 미호종개 Cobitis choii의 서식지 특성과 연령 등의 생태적 특징을 밝혀 보전학적으로 활용하기 위하여 2011년 금강 지류인 지천에서 조사를 실시하였다. 미호종개의 서식지는 하류부의 모래톱이 형성된 지역으로, 모래 입자 크기는 대부분 0.21~1.18 mm (88.7%)로 작은 편이었다. 치어는 수심이 5~20 cm로 낮고 유속은 0~15 cm/sec로 느린 곳에 주로 서식하고 있었지만, 1년생과 2년생, 3년생 이상의 개체들은 공통적으로 수심 20~50 cm, 유속 10~25 cm/sec의 느린 여울부에 서식하고 있었다. 성장은 활동기인 4월부터 10월까지 급격한 성장을 보였으나 월동기인 11월부터 3월까지는 성장을 멈추었다. 연령 (암컷)은 6월을 기준으로 만 1년생은 전장 40~61 mm, 만 2년생은 64~79 mm, 만 3년생은 80~91 mm, 만 4년생 이상은 92~106 mm로 추정되었다.

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