2017-08-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/686077摘要：日本鰻 (Anguilla japonica) 為東亞地區重要的養殖魚種，但是近年來，由於河川棲地破壞、人為濫捕、以及氣候變遷等等因素影響，天然日本鰻鰻苗數量大減，在2014年被國際自然保育聯盟 (IUCN) 列入瀕危物種，2016年華盛頓公約會議亦通過決議，在未來3年將積極評估日本鰻資源現況，作為下一屆是否將日本鰻列入附錄二物種之參考。由於鰻魚目前尚無法商業化的人工繁殖，養殖仍完全依賴天然鰻苗之供給。每年日本鰻鰻苗來游時，台灣為第一站，了解其後續在東亞陸棚之輸送擴散模式，以及地區間來游量之相關性，可以掌握產業先機；而日本鰻鰻苗進入河川後之棲地利用方式，則攸關保育政策之制定。因此本計劃擬利用耳石日齡鑑定、冬季黑潮入侵流與沿岸流分析、以及環境DNA (eDNA) 等技術，深入探討日本鰻鰻苗在東亞陸棚的輸送模式與在河川之棲地利用。本計劃具體工作項目與目標為： (一) 在台灣、中國大陸、日本、韓國與菲律賓，日本鰻鰻苗出現之重要地點，設置資源監測站，定期採集鰻苗樣本、並持續收集東亞各地區日本鰻鰻苗的來游時間與產量。 (二) 比較各區域日本鰻鰻苗之日齡特徵，並模擬冬季時之黑潮、黑潮入侵流與東亞沿岸流動態，建構地區間鰻苗輸送擴散之時空關聯性。 (三) 利用 eDNA 技術與電魚法，分析日本鰻與鱸鰻在河川中之棲地利用特徵。 <br> Abstract: The Japanese eel Anguilla japonica is an important aquaculture species in East Asia. However, in the past decades, the Japanese eel resource declines significantly, possibily due to habitat destruction, overfing and global climate change. It was listed in the IUCN red list in 2014 as the endangered species. Meanwhile, the CITES meeting in 2016 also decided to investigate the resource status of the Japanese eel and consider to list it in Appendix II in the nest meeting in 2019. Because commercialized eel artificial propogation is still unavailable, all needed eel fry are all caught from the wild. In each year, Taiwan is the first recruitment place of the glass eel. Understanding how it was transported in East Asia continental shelf as well as the relationship between recruits of different areas have great help on eel aquaculture industry. Besides, understanding the habitat usage of the Japanese eel in the river is helpful for its conservation strategy. Thus, this project will use otolith daily rings of the glass eel, Kuroshio intrusion and coastal currents in the winter, together with the environmentl DNA to study the recruitment mechanism and habitat use of the Japanese eel in East Asia.The aims of the project are to: 1. Monitor and collect Japanese glass eel from important recruitment areas in Taiwan, China, Korea, Japan and Philippines, and keep collecting the cruitment timing and abundance of the Japanese glass eel in each area. 2. Use otolith daily increments to compare the early life characteristics of the glass eel in each areas, and simulating the Kuroshio intrusion and coastal currents in the winter in order to establish the correlation between time and space of the glass eel among each areas. 3. Use eDNA and electricing methods to analyze the distribution of the A. japonica and A. marmorata in the river to clarify its habitat usage characteristics.日本鰻鰻苗來游洋流耳石日周輪河川棲地利用環境DNAAnguilla japonicaGlass eel recruitmentOceanic currentOtolith daily ringRiver habitat useeDNA