The Ministry of Oceans and Fisheries promoted the installation of eel-ladder for the purpose of creating inland water resources. Currently, eel-ladder have been installed and operated at the Geumgang Estuary Bank (2018), Yeongam Embankment (2019), and Asanman Embankment (2020). In this study, the number of glass eels in eel-ladder in 2021 was monitored and factors affecting the rise that from ocean to river of eels were investigated. Glass eels in eel-ladder were found when the salinity was relatively low, and they started when the freshwater and seawater temperatures were above 20℃. Comparing the number of occurrences by year, the largest number of glass eels was observed in 2021, but it is judged that this is not according to the distribution of glass eels in sea, but rather as a result of the investigator’s eel-ladder repair and guidance on illegal fishing.

Abstract
서 론
재료 및 방 법
    1. 조사기간 및 조사지점
    2. 조사방법
    3. 통계분석
결 과
    1. 각 지점별 소상 모니터링 결과
    2. 각 지점별 수질데이터
    3. 조석에 따른 출현 개체수 비교
    4. 연도별 출현 개체수 비교
고 찰
적 요
REFERENCES

• 김재구(알파생태연구원) | Jae Goo Kim (Alpha Research Ecology Institute) Corresponding Author
• 조윤정(알파생태연구원) | Yun Jeong Cho (Alpha Research Ecology Institute)
• 박철우(알파생태연구원) | Cheol Woo Park (Alpha Research Ecology Institute)
• 김종욱(알파생태연구원) | Jong Wook Kim (Alpha Research Ecology Institute)
• 신유신(알파생태연구원, 군산대학교) | Yu-Sin Shin (Alpha Research Ecology Institute,Faculty of Marine Applied Biosciences, Kunsan National University)
• 임민영(군산대학교) | Min-Young Im (Faculty of Marine Applied Biosciences, Kunsan National University)
• 송영희(한국농어촌공사) | Younghee Song (Rural Research Institute, Korea Rural Community Corporation)
• 김원장(한국농어촌공사) | Wonjang Kim (Rural Research Institute, Korea Rural Community Corporation)
• 최윤(군산대학교) | Yoon Choi (Faculty of Marine Applied Biosciences, Kunsan National University) Corresponding Author