National Taiwan Ocean University Institutional Repository:Item 987654321/39400
English  |  正體中文  |  简体中文  |  Items with full text/Total items : 28611/40652
Visitors : 757974      Online Users : 41
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: Age and growth study of the jack mackerel ( Trachurus japonicus ) in the northeastern waters off Taiwan
Authors: Hsueh-Jung Lu;Chih-Chun Chen;Jen-Chia Cheng
Contributors: 國立臺灣海洋大學:環境生物與漁業科學學系
Date: 2013-12
Issue Date: 2016-12-09T07:21:37Z
Publisher: Journal of Marine Science and Technology
Abstract: Abstract:Jack mackerel (Trachurus japonicus) is one of the most important fish resources in the northeastern Taiwan. Because of the flourishing of Taiwanese seiner fisheries in recent years, the proportion and catch of jack mackerels have increased. However, the studies on their age and growth are outdated, thus data on the catch-at-age composition are lacking. The present study collected jack mackerel otolith samples from May, 2010, to April, 2011, for age determination and combined those data with length and weight data from 2005 to January, 2012, to investigate the catch-at-age of jack mackerel in the northeastern waters off Taiwan. The regression equations for fork length (FL) and body weight (BW) of jack mackerel were significantly different between females and males (p < 0.05). The equations were BW = 3.6 x 10(-2) x FL2.6771 for females and BW = 3.2 x 10(-2) x FL2.7108 for males. The formation of opaque zones was used as the standard for ring calculation. Ring formation occurred once every year during January and February regardless of sex. The obtained ages and corresponding FL data were introduced into the von Bertalanffy growth function showing that the maximum FL was 40.4 cm with growth coefficient of 0.223 yr(-1). The jack mackerel catch in the northeastern waters off Taiwan were the age-0 (39%) and age-1 (38%), with high proportion of immature fish.
Appears in Collections:[Department of Environmental Biology and Fisheries Science] Periodical Articles

Files in This Item:

There are no files associated with this item.

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