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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/25759

Title: The Migratory Environmental History of Freshwater Resident Flathead Mullet Mugil cephalus L. in the Tanshui River, Northern Taiwan
Authors: Chia-Hui Wang;Chih-Chieh Hsu;Chih-Wei Chang;Chen-Feng You;Wann-Nian Tzeng
Contributors: NTOU:Department of Environmental Biology and Fisheries Science
國立臺灣海洋大學:環境生物與漁業科學學系
Keywords: Mullet;Freshwater fish;Otolith elemental composition;Migratory environmental history
Date: 2009
Issue Date: 2011-10-20T08:25:33Z
Publisher: Zoological Studies
Abstract: abstract:The diversity of the migratory environmental history of freshwater resident flathead mullet Mugil cephalus was examined by analyzing the otolith elemental composition of mullet (n = 31) collected in midstream of the Tanshui River, northern Taiwan by laser-ablation inductively coupled plasma mass spectrometry. The mullet averaged 300 ± 33 mm in fork length and 410 ± 141 g in body weight, and all were sexually immature at 1+ and 2+ yr old. Strontium (Sr)/calcium (Ca) and barium (Ba)/Ca ratios in the otolith core indicated that the mullet in the river were from 2 different groups. Group 1 (18%) fish had higher Sr/Ca ratios and lower Ba/Ca ratios in the otolith core region. Group 2 fish (82%) were opposite to group 1, with higher Sr/Ca ratios and lower Ba/Ca ratios in the otolith core region, indicating that these mullet had resided in offshore waters in early life. Beyond the core region, the Sr/Ca and Ba/Ca ratios alternately
varied, indicating that the mullet migrated between brackish and freshwater habitats after the juvenile stage. This study demonstrates that M. cephalus occupied diverse environments and migrated among marine, brackish, and freshwater habitats. More study is needed to determine whether the mullet in the Tanshui River of Taiwan is a local population and its relationship to the well-known offshore migratory population that migrates to southwestern Taiwan to spawn in Dec.
Relation: 49(4), pp.504-514
URI: http://ntour.ntou.edu.tw/handle/987654321/25759
Appears in Collections:[環境生物與漁業科學學系] 期刊論文

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