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http://dx.doi.org/10.35399/ISK.31.2.1

Recovery Success and Habitat Status of the Reintroduced Endangered Species, Acheilognathus signifer (Pisces: Cyprinidae: Acheilognathinae)  

Ko, Myeong-Hun (Kosoo Ecology Institute)
Yang, Heon (Institute of Biodiversity Research)
Bang, In-Chul (Department of Life Sciences and Biotechnology, Soonchunhyang University)
Publication Information
Korean Journal of Ichthyology / v.31, no.2, 2019 , pp. 67-76 More about this Journal
Abstract
This study was conducted from 2017 to 2018 to determine habitat aspects of Acheilognathus signifier, an endangered species reintroduced (2010~2012) to Heukcheon Stream, a tributary of the Hangang River, Korea. A total of 329 individuals were collected in 2017 (two surveys) and 723 individuals were collected in 2018 (four surveys) at about 5 km habitat area, including the discharge station. A. signifier's habitat was about 0.4 to 1.2 meters deep in slow water flow upstream of the discharge area. It was a place with many boulders and cobbles. The spawning period was estimated from April to June in terms of spawning behavior and collected juvenile size. Sex ratio of females (438) and males (412) was 1 : 0.94. Estimated age of A. signifier based on their total length distribution during the spawning period (April) indicated that 1-, 2-, 3-year old groups and more than 4-year-old group were 32~43 mm, 50~61 mm, 62~75 mm, and 76~89 mm, respectively. Age-specific composition costs differed depending on the timing of the collection. They were relatively high in the order of first-year (juvenile)>third-year> and fourth-year or higher, showing a stable age structure. Thus, A. signifier reintroduced to Heukcheon Stream has successfully settled down and formed a stable population, showing a tendency to proliferate.
Keywords
Acheilognathus signifer; habitat aspects; endangered species;
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