2013-01-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/671662摘要：本計畫將訓練科學觀察員於延繩釣漁船上採集南方黑鮪的耳石。所採集得的耳石將用於年齡查定，以判斷南方黑鮪的年齡。從年齡與體長，體重資料，將可估算得南方黑鮪的成長係數。藉由年齡與體長(體重)的轉換公式，大量的漁業記錄資料，將可用於建立我國所捕獲的南方黑鮪之年齡組成與成長。太平洋黑鮪(Thunnus orientalis)有兩處產卵場，分別為於日本海與西北太平洋區域，本計畫將檢視觀察員所採集的太平洋黑鮪耳石，以了解西北太平洋區域太平洋黑鮪產卵群體的年齡結構。 <br> Abstract: This project aims to train the scientific observers to collect otolithsof southern bluefin tuna (SBT, Thunnus maccoyii) from Taiwan longlinefishery. The age of each SBT whose otolith was collected will beestimated by examining the otolith annuli. These data together withlength and weight data will be used to evaluate the growth rateparameters of the SBT caught by Taiwanese longliners. Length and weightdata of all SBT caught will be transformed into age data to develop theage composition via the age-length (weight) key. Pacific bluefin tuna(PBT, Thunnus orientalis) has two spawning grounds, one in thenorthwestern Pacific Ocean and the other in the Sea of Japan. We willexamine the PBT otolith collected by the observers to estimate the agestructure of the PBT spawners in northwestern Pacific Ocean.黑鮪耳石年齡成長Bluefin tunaotolithage and length