유동천 및 전천의 어류상과 멸종위기종 II급 한강납줄개(Rhodeus pseudosericeus) 개체군 분석

초록

In this study, the fish fauna in the Yudong and Jeon streams were investigated three times from June to November 2020; the habitat environment, length frequency distribution, length-weight relationships, and condition factors of the Rhodeus pseudosericeus population were analyzed to facilitate the preservation and protection of the upper Seom River population. The habitat of R. pseudosericeus was mainly found to be a fourth or fifth stream with a high ratio of gravel, sand, or pearl. In total, 3,200 individuals from 28 species in nine families were collected from the Yudong stream. As legally protected species, two endangered species, Acheilognathus signalifer and R. pseudosericeus were found along with 14 Korean endemic species. The number of endangered species, R. pseudosericeus was 4.94% based on the relative abundance, of which was quadrupled compared to 1.33% in the previous year. A total of 1,415 individuals from 21 species belonging to six families were collected from the Yudong Stream. As legally protected species, one endangered species, R. pseudosericeus was found along with nine Korean endemic species. The relative abundance of R. pseudosericeus was 10.74%. The length–weight relationships and condition factor (K) of R. pseudosericeus in the Yudong and Jeon Streams indicated that both rivers were in good conditions. Based on the total length distribution, the Jeon stream showed a stable population with individuals born in the same year (0+), 1+, and 2+ years. However, the Yudong Stream showed an unstable population owing to the emergence of individuals at 0+ and 1+ years; therefore, continuous monitoring was considered necessary. Overall, unless a special event occurs, a stable population is expected to form as soon as possible in these streams; this studyed thus this provides basic data for the restoration and preservation of endangered species in the future.

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