Influence of migratory route on early maturation of swordtip squid, Uroteuthis edulis, caught off western Kyushu Island, Japan

Yamaguchi, Tadanori; Takayama, Katsumi; Hirose, Nobuyoshi

doi:10.1016/j.fishres.2022.106233

Cited by 5 publications

(21 citation statements)

References 13 publications

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“…Several ocean currents converge in the ECS to form a complex and diverse marine environment, providing sufficient materials for the growth of plankton [ 16 , 17 ]. This species shows rapid generational renewal, and four stocks are determined according to the hatching characteristics throughout the year [ 18 , 19 ]. Among them, spring stock (squid hatched from March to May) and summer stock (squid hatched from June to August) are the main fishing groups in autumn and winter in the north waters of the ECS [ 4 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

“…This species shows rapid generational renewal, and four stocks are determined according to the hatching characteristics throughout the year [ 18 , 19 ]. Among them, spring stock (squid hatched from March to May) and summer stock (squid hatched from June to August) are the main fishing groups in autumn and winter in the north waters of the ECS [ 4 , 19 ]. Throughout the life cycle, spring stock hatches in the waters of Pengjiayu in the northeast of Taiwan [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

“…The summer stock hatches in the waters of Zhoushan, Zhejiang, and paralarvae migration route is affected by the Yangtze River and Taiwan warm current [ 13 , 22 ]. In addition, in the feeding ground, spring stock body size is larger than that of summer stock, which is related to the habitat and prey abundance experienced by the stock, especially in its early life history [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

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Early Transport Patterns and Influencing Factors of Different Stocks of Uroteuthis edulis in the East China Sea

Li,

Xing,

Feng

et al. 2024

Animals

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Uroteuthis edulis (U. edulis) is an important economic loliginid resource in the East China Sea (ECS). Its flexible life history traits enable the population to quickly adapt to changes in habitat. Understanding the early transport process helps us to grasp the habitat requirements of populations at key life history stages. In this study, particle tracing was used to simulate the early transport trajectories (within 120 days). The gradient forest method (GFM) and generalized additive mixed models (GAMMs) were used to analyze the key environmental variables that affect the early transport trajectories and the impact of environmental factors on the transport process, respectively. The results showed that spring stock tracers were transported to the northeast of the release area (Pengjiayu water) and the Pacific side of Japan. Summer stock tracers were transported to the north and northeast of the release area (Zhoushan island). Current velocity, salinity, and temperature were key environmental variables that affected the trace element ratios of spring stock at early life history stages. Mixed-layer depth (MLD), velocity, and chlorophyll a concentration (Chla) were key environmental variables for summer stock. Zonal velocity was positively correlated with the trace element ratio for spring and summer stock (0.14–0.16 m/s), while the meridional velocity showed an opposite correlation. The physical driving mechanisms of the Kuroshio warm current (or the Taiwan warm current) and the Yangtze River determine the paralarva retention location during early transportation. The differences in the dominant factors of the water environment in the retention area may affect the paralarva physiological functions and food availability. This study provides a scientific basis for a comprehensive understanding of the migration characteristics of U. edulis with different stocks.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Early Transport Patterns and Influencing Factors of Different Stocks of Uroteuthis edulis in the East China Sea

Li,

Xing,

Feng

et al. 2024

Animals

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“…The annual catch from the southwest Sea of Japan to the East China Sea in 1988 was 35,300 tons but began to decline after 2000, reaching the lowest value of 3900 tons in 2019 (Fisheries Research Agency of Japan, 2021). The reasons for this decline have not yet been determined exactly, but particular concern is for high fishing pressure by foreign vessels in the southern East China Sea (Fisheries Research Agency of Japan, 2021) as the important hatching grounds of this species (Yamaguchi et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…foreign vessels in the southern East China Sea (Fisheries Research Agency of Japan, 2021) as the important hatching grounds of this species (Yamaguchi et al, 2022).…”

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confidence: 99%

Prediction of potential fishing grounds of swordtip squid (Uroteuthis edulis) based on a physical–biochemical coupled model

Ito

Takayama²,

Hirose

2023

Fisheries Oceanography

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Swordtip squid (Uroteuthis edulis), which is sometimes eaten alive (lively squid) in northwest Kyushu, Japan, is an economically important fish species in the region. However, the total catch of this species in Japan has declined by more than 80% in the last three decades. To understand and predict the spatio‐temporal distribution of fish species, we developed a one‐dimensional ecosystem (NPZD) model and a habitat suitability index (HSI) model for southwest Iki Island, northwest Kyushu, Japan. Subsequently, we conducted three numerical experiments with the HSI model, with and without the NPZD model data (with the NPZD model data: phytoplankton or zooplankton concentrations, without the NPZD model data: only the physical data of the ocean). In the HSI model with zooplankton concentrations, we found a stronger positive relationship between the HSI model values and the daily fisheries catch data of U. edulis than that using only the physical variables of the ocean as the environmental parameters. Our study thus indicates that the performance of the fishing ground prediction model will improve by utilizing the lower trophic ecosystem model such as zooplankton concentrations. Furthermore, our results would provide important implications for the efficiency of fishing operations and the conservation and management of this species.

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Dominant species of squid in the waters of Western Kalimantan and Northern Java identified by DNA barcoding method

Zamroni,

Boer,

Butet

et al. 2024

Egyptian Journal of Aquatic Research

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Influence of migratory route on early maturation of swordtip squid, Uroteuthis edulis, caught off western Kyushu Island, Japan

Cited by 5 publications

References 13 publications

Early Transport Patterns and Influencing Factors of Different Stocks of Uroteuthis edulis in the East China Sea

Early Transport Patterns and Influencing Factors of Different Stocks of Uroteuthis edulis in the East China Sea

Prediction of potential fishing grounds of swordtip squid (Uroteuthis edulis) based on a physical–biochemical coupled model

Dominant species of squid in the waters of Western Kalimantan and Northern Java identified by DNA barcoding method

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