農業部水產試驗所全球資訊網

鬼頭刀(Coryphaena hippurus)為台灣東部之主要經濟魚種之一，根據2000~2010年 漁業年報統計台東海域捕獲之鬼頭刀佔台灣總漁獲30%。鬼頭刀延繩釣作業漁法涵蓋 不同垂放深度之釣鉤，本研究目的為探討台灣東部海域海洋環境變動影響鬼頭刀移 動與棲息深度，以當地鬼頭刀延繩釣漁船進行鬼頭刀延繩釣作業試驗，於漁撈作業 漁場佈放CTD(導電溫深記錄器)，解析漁場海洋環境因子，並將溫深記錄器結附於 4種不同深度之支繩上，解析台灣東部鬼頭刀延繩釣之作業深度與漁獲率，更進一步 探究海洋環境變動與鬼頭刀移動與棲息深度之關係。

研究報告摘要(英) The dolphinfish (Coryphaena hippurus) is an economically important species in eastern Taiwan. According to the 2000-2010 annual fishery reports, the catch of dolphin fish off Taitung (eastern Taiwan) represented almost 30% of the total catch from Taiwan waters. This fishery usually operates with different setting characteristics which alter the fishing depths of hooks. The objective of this project is analyzing oceanographic variables affecting dolphinfish movement and habitat depth off eastern Taiwan waters. Local dolphin fish longline v e s s e l w a s c h a r t e r e d t o p e r f o r m e x p e r i m e n t a l l o n g l i n e s e t s . Temperaturedepth recorders (TDRs) were attached to hooks in 4 different positions representing different fishing depths in longline baskets (i.e. basket = number of hooks between floats). And CTD (Conductivity-Temperature-Depth) logger deploy at longline cruise ending location. The results will analysis the relationship between longline setting depth and fishing rate for dolphinfish. Meanwhile, it can be demonstrated the oceanographic variables affecting dolphinfish movement and habitat depth.