Volume 32 Issue 4
Jul.  2011
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GUO Hong-Yi, ZHENG Yi, TANG Wen-Qiao, SHEN Hao, WEI Kai, XIE Zheng-Li, Katsumi Ts. Behavioral migration diversity of the Yangtze River Japanese Eel, Anguilla japonica, based on otolith Sr/Ca ratios. Zoological Research, 2011, 32(4): 442-450. doi: 10.3724/SP.J.1141.2011.04442
Citation: GUO Hong-Yi, ZHENG Yi, TANG Wen-Qiao, SHEN Hao, WEI Kai, XIE Zheng-Li, Katsumi Ts. Behavioral migration diversity of the Yangtze River Japanese Eel, Anguilla japonica, based on otolith Sr/Ca ratios. Zoological Research, 2011, 32(4): 442-450. doi: 10.3724/SP.J.1141.2011.04442

Behavioral migration diversity of the Yangtze River Japanese Eel, Anguilla japonica, based on otolith Sr/Ca ratios

doi: 10.3724/SP.J.1141.2011.04442
Funds:  This work was supported by the Chinese National Science Foundation under the Grant (30771650); the Key Programs of Science and Technology Commission Foundation of Shanghai (08391910200); Special Fund for Agroscientific Research in the Public Interest (201203065);Research Fund for the Doctoral Program of Higher Education of China (20070264001); E-class Programs of Shanghai Municipal Education Commission (E03009); the Key Subject Construction of Shanghai (S30701).
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  • Author Bio:

    GUO Hong-Yi

  • Corresponding author: TANG Wen-Qiao1
  • Received Date: 2010-12-31
  • Rev Recd Date: 2011-06-27
  • Publish Date: 2011-08-22
  • The Yangtze River estuary is the main production area of Anguilla japonica in China, as well as the only existing fishery area for adult eels. Japanese eels are distributed in the main rivers and many tributaries from the Yangtze River estuary to the upper Jinsha River, which extend to nearly 3 000 km. However, their migration behaviors remain relatively unknown. We analyzed the biological characteristics of 153 specimens of silver eels collected from the Jingjiang section of Yangtze River (31º30′N, 120º42′E) between September and November, 2008, and tested the sagittal Sr/Ca ratios of 27 specimens. Among the 153 specimens examined, 85 were female and 68 were male, which translated to a female-male ratio of 1 : 0.8. The ages of the female specimens ranged from 3 to 7 a (average 5.52) with an average total length (TL) of (669±80) mm, average body weight (BW) of (555±229)g, average condition factor of 1.77±0.22, and average gonad somatic index (GSI) of 1.32±0.31. The ages of the males ranged from 3 to 5 a (average:4.38) with an average TL of (518±51) mm, average BW of (234±76) g, average condition factor of 1.62±0.18, and average GSI of 0.21±0.11. All biological parameters of females were significantly larger than those of the male specimens (P<0.05). According to the average Sr/Ca ratio (7.99±1.05) ×10-3 of the elver mark of sagitta, 17 individuals (62.96%) were river eels and 10 individuals (37.04%) were estuarine eels. Of 16 females, 13 individuals (81.25%) were river eels and 3 were estuarine eels, while of 11 males, 36.36% were river eels and 63.64% were estuarine eels. The analysis on Sr/Ca ratios for every growth layer group (GLG) indicated there were no significant differences between second-age males and females. However, significant differences were observed between the third-age, fourth-age, and migration-age male and female specimens. This was likely related to the fact that second-age eels of both sexes stay in the same inhabitation waters; however, as they grow older, they move to different areas.
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