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http://dx.doi.org/10.35399/ISK.33.3.3

Distribution Aspects and Extinction Threat Evaluation of the Endangered Species, Rhynchocypris semotilus (Pisces: Cyprinidae)  

Choi, Kwang-Seek (Kosoo Ecology Institute)
Kim, Deokki (Research Center for Endangered Species, National Institute of Ecology)
Ko, Myeong-Hun (Kosoo Ecology Institute)
Publication Information
Korean Journal of Ichthyology / v.33, no.3, 2021 , pp. 177-183 More about this Journal
Abstract
Distribution aspects and extinction threat evaluation of the endangered species, Rhynchocypris semotilus were investigated in Goseong-gun, Gangwon-do, Korea, June 2020. Among the 12 sampling sites investigated during the study period, samples of R. semotilus were collected 268 individuals at 6 sites. The streams inhabited of R. semotilus were Songhyeoncheon (3 stations), Gojindong (2 stations) and Osodong (1 station). The main habitats of R. semotilus were uppermost and upper stream (Aa type) with 3~15 m water flow width, 0.3~1.3 m depth and high ratio boulder and cobble bottoms. The estimated age of the R. semotilus (June) based on their total length distribution indicated that 0-, 1-, 2-, 3- and more than 4-year-old were 6~27 mm, 38~59 mm, 60~75 mm, 78~93 mm and 96~125 mm, respectively, and their has matured reproductive organs over two years old. R. semotilus investigation results of the threat of extinction showed no tendency to decrease in population size, but estimated to be less than 1,000 mature individuals, with a small range of extend of occurrence (39.668 km2), area of occupancy (16 km2), and number of disconnected locations (3 locations). Therefore, R. semotilus is now considered vulnerable (VU D2) based on the IUCN Red List categories and criteria.
Keywords
Rhynchocypris semotilus; endangered species; distribution status; extinction threat evaluation;
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