農業部-水產試驗所全球資訊網農業部-水產試驗所全球資訊網

一.東部海域鬼頭刀資源之調查與評估鬼頭刀（Coryphaena hippurus），廣泛分布在熱帶及亞熱帶海域，為高度洄游性魚類之一種，亦為臺灣重要之經濟魚類。本計畫利用歷年研究結果進一步推估單位加入生產量(Yield-per-recruit)，以及推估單位加入產卵親魚量(Spawning-stockbiomassper-recruit, SSB/R)，進一步推估生殖潛能比例(Spawning potential ratio,SPR)，以瞭解目前鬼頭刀資源之開發利用現況。同時利用所得研究成果推估最適漁獲死亡率或開始漁獲年齡，以提供漁業管理之參考科學依據。二.臺灣近海鮪類資源之漁海況調查持續進行延繩釣漁獲試驗及鮪類仔稚魚調查，並由CTD、ADCP所記錄各水層海流流向及溫鹽變化解析鮪類的來游行進路線、棲息水深，以了解及蒐集鮪類地理分布與海洋環境資訊，並於魚市場蒐集相關漁獲組成及進行鮪類體長測定，並將所蒐集資訊建立資料庫太平洋黑鮪每年四月至七月間，洄游至我國東部海域，成為我國近海鮪延繩釣漁業最重要的漁獲魚種。經由鮪仔稚魚分布調查可瞭解其產卵場；經由表水溫衛星影像解析配合標本船作業資訊與試驗船現場進行的漁獲試驗與海洋觀測將可瞭解黑鮪洄游路徑變動（漁場）與海洋環境關係，可提供漁民作業參考。三.臺灣周邊海域鯖鰺仔稚魚分布之調查研究本計畫研擬的主要目的是為了瞭解台灣周邊海域鯖鰺仔稚魚之種類及現存量。同時，瞭解其季節變化與地理分布，並探究該等魚種仔稚魚的豐度及時空變化。除測定仔稚魚豐度外，同時，計測採集網具之濾水量、海水之溫度、鹽度及葉綠素等含量。將鯖鰺仔稚魚經篩揀、分類、鑑定和計數後，標本分別保存於5%酒精與10%福馬林溶液中，以供進一步之調查分析用，俾作為該項漁業資源的預報及速報參考。試驗方法主要為標本船作業資料的蒐集整理及魚市場鯖鰺標本魚的抽樣調查，並量測各魚種之尾叉長、體重、生殖腺及胃內容物等生物學特性。按季運用本所試驗船前往臺灣東北部冷渦附近鯖鰺仔稚魚主要棲息地，以仔稚魚網Bongonet垂直速度20 m/min採集鯖鰺仔稚魚。採得之仔稚魚攜回實驗室進行種類鑑定及其數量比對分析。試驗船所實地調查所取得之漁場水文環境資訊配合配合衛星遙測資料蒐集後相互對照比對，祈建立漁海況預報並提供業者參考。

一.東部海域鬼頭刀資源之調查與評估The dolphinfish, Coryphaena hippurus, is a pelagic and migratory fish, distributedthroughout tropical and subtropical waters, an economically important fish in Taiwan.The project will utilize the results of previous studies to conduct yield-per-recruit andspawning-stock-biomass per-recruit analysis. Spawning potential ratio willalso be estimated to understand the present fishery status for dolphinfish in the easternwaters of Taiwan. Based on the above analysis, the moderate fishing mortality and age atfisrt capture would be determined to provide a reference for fishery management.二.臺灣近海鮪類資源之漁海況調查Tuna resource is abundant in central-western Pacific Ocean. Moreover, the easternwaters off Taiwan are noted as the migrating route and potential spawning grounds forPacific bluefin tuna. The aims of this study are (1) analyzing the historic catch statistics ofTaiwan's offshore longline fishery by the geographic information system (GIS) softwareto understand the spatial and temporal transitions characteristics of this fishery; (2)determining the possible key factors for the formation mechanism of the tuna's fishingground either by analyzing catch information obtained from the R/V and/or fishingvessels; or by the satellite surface temperature images and CTD information in situ.三.臺灣周邊海域鯖鰺仔稚魚分布之調查研究Base on the fishing account data derived from Nan-Fan Ao fishing market, theaccumulating production during Jan.-Oct., 2005 reached to 74,754 tons about 1.61times more than that of 46,343 tons in 2004, and they are two of the most importanteconomic fishes and can be caught all the year round in Taiwan. Therefore, the mainpurpose of this project planed is try to realize the distribution status and the abundanceof the mackerel and scad larvae in the waters of Taiwan, and its geographic and spacialdistribution whether various with the seasonal changes or not are also investigated. Themethods used in this study are the CTD was used for measuring water temperature andsalinity (Seabird-19 with 637 style), and the casting depth was at 500 m in depth. Thelarval fishes were conducted and sampled by Bongo net at depth of 100 meters Thevelocity of sampling Bongo net upward was set at 20 m/min. And all the sampling larvalfishes were stored on the bottle with 10% formalin and 95% alcohol respectively for thefuture analysis. The size of each of the larval fish schools was served as a cylinder andmeasured by the estimation equations. All the data collected and analyzed are given tothe government as a mackerel and scad fishery police reference. A total of 53 operatingstations with Bongo net at vertical speed of 20 m per minute to collect the larvae, CTDare also planed to conduct to realize the relationship between the larvae and fishingground environment in the forthcoming year.