Variations in the migratory history of the tropical catadromous eels Anguilla bicolor bicolor and A. bicolor pacifica in south-east Asian waters

被引:12
作者
Arai, Takaomi [1 ]
Chino, Naoko [2 ]
机构
[1] Univ Brunei Darussalam, Fac Sci, Environm & Life Sci Programme, Jalan Tungku Link, BE-1410 Gadong, Brunei
[2] Univ Tokyo, Atmosphere & Ocean Res Inst, Chiba, Japan
关键词
Anguilla bicolor; anguillids; habitat use; life history; migration; tropical eel; GIANT MOTTLED EEL; HABITAT USE; FRESH-WATER; JAPANESE EEL; STRONTIUMCALCIUM RATIOS; OTOLITH SR/CA; EUROPEAN EEL; SEA EELS; JAPONICA; MARMORATA;
D O I
10.1111/jfb.13952
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Fish movements between aquatic habitats of different salinity ranges (fresh, estuarine, marine) by the tropical catadromous eels Anguilla bicolor bicolor and A. bicolor pacifica were examined by analysing the otolith strontium and calcium concentrations of yellow (immature) and silver (mature) stage eels collected in south-east Asian (Indonesia, Malaysia and Vietnam) waters. The ratios suggest that all migratory-type eels, including freshwater, brackish water and marine residents, pass the river mouth. However, the habitat preference was different among the sites (countries). In Indonesia and Vietnam, most A. bicolor bicolor and A. bicolor pacifica were either marine or brackish water residents in this study. Alternatively, most A. bicolor bicolor were freshwater residents in Malaysia; such a typical catadromous migration pattern in these eels has not been found in previous studies. The wide range of otolith Sr:Ca in both subspecies indicates that the habitat use of these tropical eels was opportunistic among fresh, brackish and marine waters during their growth phases following recruitment to coastal areas. The geographical variability of migratory histories suggests that habitat use might be determined by the inter and intraspecific competition and environmental conditions at each site.
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页码:752 / 758
页数:7
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