Interannual to decadal variability of the Kuroshio Current in the East China Sea from 1955 to 2010 as indicated by in-situ hydrographic data

2013 ◽  
Vol 69 (5) ◽  
pp. 571-589 ◽  
Author(s):  
Yanzhou Wei ◽  
Daji Huang ◽  
Xiao-Hua Zhu
Keyword(s):  
East China Sea ◽  
Decadal Variability ◽  
Kuroshio Current ◽  
East China ◽  
The East China Sea ◽  
Hydrographic Data ◽  
China Sea ◽  
The Kuroshio

Collection of spawning-condition eels of Ariosoma meeki in the Kuroshio Current in the East China Sea

2016 ◽  
Vol 96 (8) ◽  
pp. 1701-1707 ◽  
Author(s):  
Shun Watanabe ◽  
Seishi Hagihara ◽  
Michael J. Miller ◽  
Masamichi Machida ◽  
Kosei Komatsu ◽  
...  
Keyword(s):  
Continental Shelf ◽  
East China Sea ◽  
Seminal Fluid ◽  
Kuroshio Current ◽  
East China ◽  
The East China Sea ◽  
Reproductive Condition ◽  
China Sea ◽  
Gonad Somatic Index ◽  
The Kuroshio

When and where marine eels spawn is poorly known even though species such as those of the family Congridae, Muraenidae and Ophichthidae can be caught in continental shelf habitats. The congrid genus Ariosoma includes small continental shelf eel species whose life histories are not yet known. Mature male and female eels of Ariosoma meeki were observed and captured on 17 August 2009 at the surface at night in the western side of the Kuroshio Current in the East China Sea close to new moon, while they were swimming slowly at the surface and exhibiting apparent reproduction-related behaviour. One male and one sex-unidentified eel (seemingly a male based on body shape) were observed to be chasing one larger female with their heads located near her urogenital pore area. The gonads of the female (540 mm) and the male (410 mm) that were caught by a long-handled dip net were in reproductive condition, because some eggs or seminal fluid were released during handling of the two specimens and high gonad-somatic index (GSI) values of 53 in the female and 20 in the male were recorded. This is one of the few cases in which fully ripe reproductive-condition marine eels have been observed or collected and it provides rare information about the spawning location and timing of this eel species.

Is the Kuroshio Current a strong barrier for the dispersal of the gizzard shad (Konosirus punctatus) in the East China Sea?

2017 ◽  
Vol 68 (5) ◽  
pp. 810 ◽  
Author(s):  
Na Song ◽  
Tianxiang Gao ◽  
Yiping Ying ◽  
Takashi Yanagimoto ◽  
Zhiqiang Han
Keyword(s):  
East China Sea ◽  
Coastal Waters ◽  
Kuroshio Current ◽  
Gizzard Shad ◽  
East China ◽  
The East China Sea ◽  
China Sea ◽  
Konosirus Punctatus ◽  
The Kuroshio ◽  
Strong Barrier

The gizzard shad (Konosirus punctatus) is a common pelagic fish in the East China Sea. To evaluate the influence of Kuroshio Current in shaping the genetic structure of marine species, 10 populations of K. punctatus from Chinese and Japanese coastal waters were collected for analysis based on the mitochondrial DNA marker. All the Japanese populations exhibited higher nucleotide diversity than did Chinese populations. Two distinct clades were identified by the neighbour-joining tree based on haplotypes of Cyt b and the control region. Both AMOVA and pairwise Fst strongly supported the significant genetic divergence between Chinese and Japanese clades, which suggested strictly limited gene exchange. The mismatch distribution of Chinese clade and Japanese Clade B appeared to be unimodal, and Tajima’s D and Fu’s Fs statistics were significantly negative, and, therefore, the hypothesis of selective neutrality was rejected. The results indicated that the Kuroshio Current may not be the strong barrier for the dispersal of K. punctatus in the East China Sea. The climate of Pleistocene periods had played an important role in phylogeographical patterns of K. punctatus and the dispersal strategy of coastal species may be the major current physical barrier for the gene flow among populations from Chinese and Japanese coastal waters.

scholarly journals Seasonal Exchanges of the Kuroshio and Shelf Waters and Their Impacts on the Shelf Currents of the East China Sea

2016 ◽  
Vol 46 (5) ◽  
pp. 1615-1632 ◽  
Author(s):  
Jia Wang ◽  
Lie Yauw Oey
Keyword(s):  
East China Sea ◽  
East China ◽  
Shelf Edge ◽  
The East China Sea ◽  
China Sea ◽  
Northeasterly Wind ◽  
In Situ Observations ◽  
Vorticity Production ◽  
The Kuroshio

AbstractPrevious in situ observations and modeling studies have indicated that, through mass and momentum exchanges across the shelf edge, the Kuroshio can significantly influence the shelf currents of the East China Sea (ECS). Here, instead of localized observations, this study uses 25 yr of drifter data, supported by satellite and other data to identify seasonal cross-shelf exchanges along the entire shelf edge. The authors show that Kuroshio meanders onshore from fall to winter and offshore from spring to summer, with the largest amplitude northeast of Taiwan. The influence is limited to the shelf edge when the Kuroshio meanders offshore in spring and summer. By contrast, strong onshelf intrusions and cross-shelf exchanges occur when the Kuroshio meanders onshore in fall and winter. Drifters intrude onshelf northeast of Taiwan and spread as far north as 30°N against the strong northeasterly wind. The forcing on the shelf is identified as a northward downsloping of the sea level that is steepest north of Taiwan at 25°–28°N, but which is 3 times weaker farther north. The vorticity budget computed from a numerical model indicates that intrusion during fall and winter is primarily a result of balance between onshelf advection of ambient potential vorticity and vorticity production by the along-isobath pressure gradient acting on the changing mass of water column across the continental slope.

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