2015-03-012024-05-15https://scholars.lib.ntu.edu.tw/handle/123456789/662742摘要：日本鰻是東亞各國水產養殖的重要魚種之一，具有極高的經濟價值。雖然人工繁殖已在日本成功，但因成本過高而尚無法商業化量產，因此目前養殖所需的大量鰻苗仍然依賴天然捕撈，成為養殖產業的重大瓶頸。根據估計，東亞地區現今的日本鰻資源量相較於1970年代而言，估計低於當年的10 ﹪。近幾年鰻苗捕獲量頻創新低，一尾鰻苗身價甚至高達200元，困擾著整個東亞的鰻魚產業。因此，建立適當的日本鰻資源管理與復育方針，有效增加天然鰻苗之資源，是現階段鰻魚產業能夠永續發展的關鍵。因此，為了增加國內鰻魚資源量，本年度計畫工作項目有四: (1) 持續協助水產試驗所進行日本鰻放流計劃，選定臺灣宜蘭縣宜蘭河、新竹縣鳳山溪以及屏東縣高屏溪，進行日本鰻的標識放流，並分析人工放&#63946;之日本鰻於自然環境中之成長、成熟與遷徙動態，評估放流效益，以作為後續辦&#63972;鰻魚有效放&#63946;工作之依據。 (2) 蒐集國際鰻魚放流效益評估、遺傳與其他之相關資訊及研究進展，以期了解鰻魚族群洄 游機制。 (3) 為&#63930;解宜蘭河、鳳山溪以及高屏溪河川中鰻魚資源量與分布情況，本年度將持續追蹤宜 蘭河流域，鳳山溪流域以及高屏溪流域之鰻魚資源量現況，藉以評估鰻魚保育與放流成效。 利用電捕方式採捕鰻魚，計算單位面積採捕量，用以推估河川鰻魚總資源量。另一方法係 利用蛇籠方式採捕鰻魚，利用天然鰻與放流鰻之回收比例，推估該河川鰻魚總資源量。 (4) 人工種鰻增殖放流，為增加鰻苗資源量的手段之一。然而，種鰻降海後是否能成功洄游 至產卵場的問題，至今仍未知。本年度計劃進行鰻魚衛星標識放流先導試驗，追蹤野生鰻 以及放流鰻降海後之海洋旅程，研判放流鰻是否也能成功洄游至產卵場。 <br> Abstract: Japanese eel is an important aquaculture species in East Asia with high economic value. Although artificial propagation of the glass eel has been successful, the commercial scale of production still cannot been established yet due to high cost. Thus, the needed fries are all caught from the wild till now, resulting in a serious bottleneck for the eel aquaculture industry. It is estimated that the current eel resource in East Asia is less than 10% in comparing to that in year 1970s. However, the amounts of glass eel catch in recent years decline rapidly, with one piece of glass eel even charging more than 200 NTD. This seriously bugs the eel aquaculture in East Asia. Thus, to manage and recover the valuable natural eel resource is a key for the sustainability of eel aquaculture industry. To increase the eel resource in Taiwan, this project aim to: 1. help the stock releasing program of the Taiwan Fisheries Research Institute. This year the releasing sites will be at Yilan River, Fengshan River and Kaoping River after tagging. The growth, maturation and migration of the released eel will be evaluated to improve the efficiency of the stock releasing work in the future. 2. Collect information about the eel releasing and evaluation status, and genetic study for the eel dispersal and migratory mechanism. 3. understand the eel resource status at Yilan River, Fengshan River and Kaoping River. The data comparison between years could evaluate the eel conservation and stock releasing efficiency. 4. clarify if the released eels could successfully migrate back to the spawning site by satellite pop-up tagging experiment.鰻魚資源量人工放流效益評估衛星標識放流EelResource AbundanceStock ReleasingBenefit EvaluationSatellite tag marking