소양호 빙어 개체군의 생태적 특성

• Published in: 농업생명환경연구 Vol. 35; no. 1; pp. 47 - 59
• Main Authors: 홍두표, Doupyo Hong, 이재용, Jaeyong Lee, 김범준, Bumjun Kim, 최재석, Jaeseok Choi
• Format: Journal Article
• Language: Korean
• Published: 강원대학교 농업생명과학연구원 01.03.2023; 농업생명과학연구원
• Subjects: Dwarfization; Food sources; Geographical distribution; Growth stage; Length-weight relationship; 농학
• ISSN: 2233-8322; 2508-870X
• DOI: 10.22698/jales.20230004

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.