Ecological Characteristics of Hypomesus nipponensis Populations of Lake Soyang

Doupyo Hong; Jaeyong Lee; Bumjun Kim; Jaeseok Choi

doi:10.22698/jales.20230004

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2023 Vol.35, Issue 1 Preview Page Next Page

Research Article

Ecological Characteristics of Hypomesus nipponensis Populations of Lake Soyang 소양호 빙어 개체군의 생태적 특성

31 March 2023. pp. 47-59

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Abstract

To investigate the ecological characteristics that affect the growth of the Hypomesus nipponensis population in Lake Soyang, 615 H. nipponensis specimens were collected from the lake and examined 10 times between January and April 2019 and between January and March 2020. In 2019, the total length of Lake Soyang’s H. nipponensis was 73.3 ± 4.7 mm, and the weight was 1.9 ± 0.5 g. In 2020, the total length was 64.4 ± 12.3 mm, and the weight was 1.4 ± 1.3 g. The individuals collected in 2020 were smaller than those collected in 2019. During the survey period, the growth b values were highest in January and lowest in February, at 3.4 and 2.9, respectively. The obesity K value was negative in three out of four surveys conducted in February. The sex ratio of Lake Soyang’s H. nipponensis was 1 : 1.93, with males being more numerous, and the average number of females was 5457.9 ± 2152.9. As previous studies have shown, Bosmina longirostris, a tectonic species, accounted for 73% of H. nipponensis’ diet. The geographical distribution of H. nipponensis differed depending on its growth stage. The total length and weight of H. nipponensis collected in Bupyeong-ri, upstream of Lake Soyang, were 74.9 ± 10.9 mm and 2.4 ± 2.8 g, respectively. In contrast, specimens collected from Susanna-ri, located downstream, were much smaller, measuring only 48.1 ± 7.7 mm in length and 0.54 ± 0.3 g in weight. This study revealed that the distribution of H. nipponensis living in Lake Soyang, which has a long resin-type topography, varies depending on the growth stage. H. nipponensis is a cold-water fish species highly sensitive to water temperature changes. Its stocks are distributed throughout the country, including in Gangwon-do, and serve as effective environmental bioindicators. As such, these findings contribute to the understanding of H. nipponensis populations and water environments in distribution areas, particularly with regard to the impacts of climate change.

Keywords

Dwarfization

Food sources

Geographical distribution

Growth stage

Length-weight relationship

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Information

Publisher :Agriculture and Life Sciences Research Institute, Kangwon National University
Publisher(Ko) :강원대학교 농업생명과학대학 농업생명과학연구원
Journal Title :Journal of Agricultural, Life and Environmental Sciences
Journal Title(Ko) :농업생명환경연구
Volume : 35
No :1
Pages :47-59
Received Date : 2023-02-06
Revised Date : 2023-02-21
Accepted Date : 2023-02-27
DOI :https://doi.org/10.22698/jales.20230004

Journal of Agricultural, Life and Environmental Sciences ISSN:2233-8322(Print) 2508-870X(Online) 농업생명환경연구

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