2008-09-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/678165摘要：東海陸棚是東北西太平洋最重要的漁場，與台灣沿近海漁業的興盛密不可分，然而長江截流後已經對此海域造成巨大改變，最主要的影響是輸入東海的營養鹽顯著減少，我們認為這項環境轉變勢必會對魚類的成長造成負面影響，然而到目前為止尚未有任何人針對此問題進行過研究。本計畫將從魚種的初期生活史探討海洋基礎生產力，餌料生物與溫鹽變化對仔稚魚成長所造成的影響，魚苗的採集將配合研究船的航次於東海進行穿越線採集，藉由耳石的微細構造所記錄的初期生活史，比較不同水團間，相同種類魚苗的成長差異。另外，我們將採集東海沿岸的大型底棲性魚類，並且從成魚耳石年輪所記錄的長期性魚類成長變化中，瞭解長江截流前後是否改變魚類的成長狀況。其次，耳石的化學組成特性則能反映出水團間的水文差異性，我們將使用誘導藕和電漿質譜儀以及穩定性同位素質譜儀分析耳石的元素組成，以瞭解海洋性魚類於東海的複雜水團間的分布，擴散，混雜與洄游等議題。<br> Abstract: The continental shelf of East China Sea (ECS) is the most important fishing ground in the northeastern Pacific. The catch of Taiwanese neritic fisheries predominantly come from this area. However, the Three-Gorges Dam (TGD) has dramatically changed the environmental feature of the ECS, predominantly by reducing the nutrient influx. We suspect that reduction of primary production and changing of nutrient ratio in the ECS shall subsequently cause negative effects on fish growth. Nevertheless, there is no research being conducted to evaluate the TGD-induced environmental impacts on fish growth. This project aims to study the relationship between larval growth and oceanic conditions, including primary production, food abundance, temperature and salinity. The larval fish will be collected by the research vessels across the transection of the ECS and their otolith microstructure will be examined to compare their growth profile among different water mass. In addition, we will test the hypothesis if long-term reduced primary production will retard the fish growth. This question can be evaluated by examining the otolith annuli, which record the long-term life history of demersal fish. We will analyze the otolith microchemical composition of the collected fish by Induced-Couple Plasma Mass Spectrometer and Isotope Ratio Mass Spectrometer. The derived information of otolith chemical composition will be useful to understand the mechanism of larval distribution, dispersion, mixing and migration among the different water mass in the ECS.東海陸棚魚類耳石成長Continental shelf of East China SeaFishOtolithGrowth