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Habitat Characteristics and Estimation of the Age of the Endangered Miho Spine Loach, Cobitis choii (Pisces: Cobitidae) in Ji Stream, Guem River, Korea  

Ko, Myeong-Hun (Division of EcoScience, Ewha Womans University)
Bang, In-Chul (Department of Life Sciences and Biotechnology, Soonchunhyang University)
Publication Information
Korean Journal of Ichthyology / v.30, no.1, 2018 , pp. 46-54 More about this Journal
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.
Keywords
Endangered fish; Cobitis choii; habitat characteristics; growth; age;
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