Current Dependent Dispersal Characteristics of Japanese Glass Eel around Taiwan

Hsiung, Kuan-Mei; Lin, Yen‐Ting; Han, Yi

doi:10.3390/jmse10010098

Cited by 8 publications

(8 citation statements)

References 46 publications

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“…The regional composition of the total recruitment number, divided into eight coasts (HK, PN, PE, PW, SI, KS, JW, and JN coasts), was used for a direct comparison with those from eDNA detection (Figure 1). Considering the arrival period of glass eels off Taiwan (Hsiung et al, 2022), we conducted ensemble experiments every year during 2008–2017, where the release dates were November 15, December 1 and 15, January 1 and 15, and February 1 of every year and discussed the composite results.…”

Section: Methodsmentioning

confidence: 99%

“…The leptocephali drift westward and northward by the North Equatorial and Kuroshio Currents, respectively and sequentially, although those entrained into the Mindanao Current flow toward the equator lapse into abortive migration (Kim et al, 2007; Kimura & Tsukamoto, 2006; Zenimoto et al, 2009). Metamorphosis into juvenile fish (glass eels) occurs near Taiwan (Fukuda et al, 2018; Shinoda et al, 2011), where glass eels generally arrive from November to February, with a sharp peak between December and January (Hsiung et al, 2022). The fishing season for glass eels in Japan is from December to April.…”

Section: Introductionmentioning

confidence: 99%

“…Metamorphosis into juvenile fish (glass eels) occurs near Taiwan (Fukuda et al, 2018;Shinoda et al, 2011), where glass eels generally arrive from November to February, with a sharp peak between December and January (Hsiung et al, 2022). The fishing season for glass eels in Japan is from December to April.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Inshore migration of Japanese eel Anguilla japonica encouraged by active horizontal swimming during the glass eel stage

Karaki

Sakamoto

Yamanaka

et al. 2023

Fisheries Oceanography

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The biomass of the Japanese eel (Anguilla japonica) is generally determined by the recruitment of glass eels into freshwater habitats, but the behavioral biology of their inshore migration remains unknown. With the aid of an ocean prediction system, we elucidated a recruitment migration scenario that can quantitatively reproduce a regional difference in biomass in Japan, which was previously estimated by an environmental DNA sampling method. For their successfully reaching shores, it is necessary to incorporate behavioral changes of glass eels within their migration on the Kuroshio Current, such as shallower depth preferences and horizontal swimming toward lower salinity water. In particular, the latter is essential for encouraging recruitment into both the Seto Inland Sea, with a relatively high ratio (20%–30%) of the total recruitment to Japan and the coasts in the central part of the Pacific side of northern Japan (i.e., the northern limit of the habitable distribution), manifesting that glass eels actively swim toward freshwater near coastal regions. In the subsurface layer, where glass eels mainly conduct diel vertical migration, there is a bifurcation path connecting the Kuroshio Current to the second and third branches of the Tsushima Warm Current, restricting the recruitment of glass eels into the Sea of Japan side of the main inland in Japan. The simulated recruitment validated that the eDNA acts as a proxy indicator for estimating the relative biomass on the regional scale. The simulation supported that the inshore migration of glass eels is determined by active horizontal swimming.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Inshore migration of Japanese eel Anguilla japonica encouraged by active horizontal swimming during the glass eel stage

Karaki

Sakamoto

Yamanaka

et al. 2023

Fisheries Oceanography

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“…The Japanese eel, A. japonica, is a catadromous species, with its spawning area located at approximately 142−143 • E in the North Equatorial Current (NEC), west of the Mariana Ridge [8][9][10]. It is widely distributed in the western Pacific, ranging from the Philippines in the south, through Taiwan, mainland China, and Korea, to the north Japan [9,[11][12][13][14]. After hatching, the eel larvae, referred to as leptocephali, are transported by the westwardflowing NEC and the northward-flowing Kuroshio towards the continental shelf, where they undergo metamorphosis into glass eels and eventually become pigmented elvers within estuaries [11].…”

Section: Introductionmentioning

confidence: 99%

Recruitment Patterns and Environmental Sensitivity of Glass Eels of Anguilla japonica in the Yangtze Estuary, China

Guo,

Zhang,

Zhang

et al. 2024

Biology

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The decline of Japanese eel (Anguilla japonica) populations in the Yangtze River estuary represents a critical conservation concern. Eleven-years of daily catch data during recruitment periods (i.e., January–April, 2012–2022) indicate that annual catch averaged from 153 to 1108 eels, and show a bimodal pattern in glass eel arrivals. Utilizing seasonal-trend decomposition and generalized additive models, we demonstrated a strong correlation between catch abundance, optimal water temperatures, and lunar cycles. An auto-regressive integrated moving average (ARIMA) model predicts an increase in glass eel numbers for 2023–2024 but also points to a concerning trend of delayed recruitment timing since 2016, attributable to the 0.48 °C per decade rise in sea surface temperatures. This delay correlates with a significant decrease in the average body weight of glass eels, suggesting potential energy deficits that may hinder successful upstream migration. This study not only furthers our understanding of glass eel recruitment dynamics but also underscores the urgent need for targeted conservation measures. Additionally, it highlights the importance of sustained, detailed monitoring to mitigate the detrimental effects of climate change on these eels, vital for preserving the Yangtze River’s ecological integrity.

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“…In the western North Pacific (WNP), the North Pacific subtropical gyre (NPSG) is a key feature that shapes regional climate. Variations in the strength of the NPSG modulate regional circulations in the East China Sea and South China Sea, the strengths of the Mindanao, Taiwan Strait, and Luzon Strait currents 10 – 12 , typhoon development 13 , and even fish migration 14 – 20 . For example, a weakening (strengthening) of the Kuroshio, which is the western boundary current of the NPSG, can induce more (less) intrusion events into East China Sea and South China Sea, affecting fish migration, as well as mass, heat, salinity, and nutrient balances 11 , 12 , 21 – 25 .…”

Section: Introductionmentioning

confidence: 99%

Seasonally-reversed trends in the subtropical Northwestern Pacific linked to asymmetric AMO influences

Lin,

Terng,

et al. 2023

Sci Rep

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This study identifies seasonally-reversed trends in Kuroshio strength and sea surface temperatures (SSTs) within the western North Pacific (WNP) since the 1990s, specifically in the 22° N–28° N region. These trends are characterized by increases during summer and decreases during winter. The seasonally-reversed trends are a result of the asymmetric responses of the WNP to a shift towards the positive phase of the Atlantic multidecadal oscillation (AMO) around the same period. The positive AMO induces an anomalous descent over the North Pacific during summer, leading to the direct strengthening of the gyre. However, during winter, it triggers an anomalous descent over the tropical Pacific, which excites a poleward wavetrain impacting the WNP and causing gyre weakening. The associated responses of the East Asian monsoon and China Coastal Current contribute to the observed seasonally-reversed SST trends. It is noteworthy that the seasonally-reversed trends in gyre strength and SSTs are predominantly observed north of 20° N in the WNP. This limitation arises because the anomalous cyclone within the winter poleward wavetrain is located north of this latitude boundary. Specifically, the clearest trends in gyre strength are observed in the northern segment of the Kuroshio, while the manifestation of SST trends in the Taiwan Strait could potentially be attributed to the influence and enhancement of the East Asian monsoon and the China Coastal Current. Due to the limited length of observational data, statistical significance of some of the signals discussed is rather limited. A CESM1 pacemaker experiments is further conducted to confirm the asymmetric responses of the North Pacific to the AMO between the summer and winter seasons.

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Current Dependent Dispersal Characteristics of Japanese Glass Eel around Taiwan

Cited by 8 publications

References 46 publications

Inshore migration of Japanese eel Anguilla japonica encouraged by active horizontal swimming during the glass eel stage

Inshore migration of Japanese eel Anguilla japonica encouraged by active horizontal swimming during the glass eel stage

Recruitment Patterns and Environmental Sensitivity of Glass Eels of Anguilla japonica in the Yangtze Estuary, China

Seasonally-reversed trends in the subtropical Northwestern Pacific linked to asymmetric AMO influences

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