Distribution of leptocephali of the freshwater eels,genus <Emphasis Type="Italic">Anguilla</Emphasis>, in the waters off west Sumatra in the Indian Ocean |
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Authors: | Jun Aoyama Sam Wouthuyzen Michael J Miller Yuki Minegishi Mari Kuroki Sasanti R Suharti Tatsuya Kawakami Krunaen O Sumardiharga Katsumi Tsukamoto |
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Institution: | (1) Ocean Research Institute, The University of Tokyo, 1-15-1 Minamidai, Nakano Tokyo, 164-8639, Japan;(2) Research Center for Oceanography, Indonesian Institute of Sciences, Jl. Pasir Putih 1, Ancol Timur, Jakarta, 11480, Indonesia |
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Abstract: | A research cruise was conducted in the eastern Indian Ocean off west Sumatra, Indonesia, in June 2003 to learn about the spawning
and larval ecology of the tropical freshwater eels of the genus Anguilla in the region. A total of 43 anguillid leptocephali were collected during the cruise and they were genetically identified
as 41 Anguilla bicolor bicolor, 1 Anguilla marmorata, and 1 Anguilla interioris. A. bicolor bicolor leptocephali were 44.1–55.5 mm TL and most of them were at the fully grown stage. Reexamination of the historical data of
Jespersen (1942) also suggested a relatively low abundance of small size leptocephali (<40 mm) of this species off west Sumatra. Although
the study area has long been considered to be a spawning site of A. bicolor bicolor, the distributions of leptocephali from the two surveys and the patterns of ocean currents in the region suggest the possibility
that the main spawning area of this species is located farther offshore. |
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Keywords: | Freshwater eels Indian Ocean Larval migration Distribution Spawning area |
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