The migratory environmental history of freshwater resident flathead mullet Mugil cephalus L. in the Tanshui River, northern Taiwan

Chia Hui Wang, Chih Chieh Hsu, Chih Wei Chang, Chen Feng You, Wann Nian Tzeng

研究成果: Article同行評審

22 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)504-514
頁數11
期刊Zoological Studies
49
發行號4
出版狀態Published - 2010 七月 1

All Science Journal Classification (ASJC) codes

  • Animal Science and Zoology

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