National Taiwan Ocean University Institutional Repository:Item 987654321/25227
English  |  正體中文  |  简体中文  |  Items with full text/Total items : 28611/40652
Visitors : 777156      Online Users : 48
RC Version 4.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search

Please use this identifier to cite or link to this item:

Title: Abundance trends of two neon flying squid (Ommastrephes bartramii) stocks in the North Pacific
Authors: Chih-Shin Chen
Contributors: NTOU:Institute of Marine Affairs and Resource Managemen
Keywords: abundance;dynamic factor analysis;North Pacific;Ommastrephes bartramii;squid fishery
Date: 2010
Issue Date: 2011-10-20T08:21:43Z
Publisher: ICES Journal of Marine Science
Abstract: abstract:Two stocks of neon flying squid (Ommastrephes bartramii) have been identified in the North Pacific, with differing life-history traits and geographic distributions, one in the Northeast Pacific and the other in the Northwest Pacific, each with seasonal cohorts. Both stocks are targeted by commercial fishing fleets from China, Japan, and Taiwan. The variability in abundance for each stock has been studied independently, but a comparable analysis between the two stocks is lacking. The abundance trends for the two stocks were examined using catch data from the Taiwanese squid fishery between 1986 and 2006. A time-series of monthly catch per unit effort and three explanatory variables, sea surface temperature in the presumed hatching grounds, the Southern Oscillation Index, and the number of vessels, were analysed using dynamic factor analysis to quantify squid abundance. The optimal model contained one common trend and all three explanatory variables. The Northwest Pacific and Northeast Pacific stocks exhibited opposing trends in abundance, and the results suggest that large-scale environmental factors, rather than regional factors, are more critical in influencing the abundance of oceanic squid species.
Relation: 67(7), pp.1336-1345
Appears in Collections:[Institute of Marine Affairs and Resource Managemen] Periodical Articles

Files in This Item:

File Description SizeFormat

All items in NTOUR are protected by copyright, with all rights reserved.


著作權政策宣告: 本網站之內容為國立臺灣海洋大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,請合理使用本網站之內容,以尊重著作權人之權益。
網站維護: 海大圖資處 圖書系統組
DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback