文献类型： 外文期刊

第一作者： Xu, Min

作者： Xu, Min;Yang, Linlin;Liu, Zunlei;Zhang, Yi;Zhang, Hui;Xu, Min;Yang, Linlin;Liu, Zunlei;Zhang, Yi;Zhang, Hui

作者机构：

关键词： Sepia esculenta; seasonal variation; spatiotemporal distribution; East China Sea region; fishery management; average individual weight; global warming; golden cuttlefish

期刊名称：ANIMALS （ 影响因子：3.0； 五年影响因子：3.2 ）

ISSN： 2076-2615

年卷期： 2024 年 14 卷 10 期

页码：

收录情况： SCI

摘要： Simple Summary: Since the 1990s, the golden cuttlefish (Sepia esculenta) has become the dominant cuttlefish fisheries target in the seas around China. In this paper, we aim to determine the current resource status and spatio-seasonal variation in the population in the East China Sea region. We found more juveniles at latitudes of 27.50-28.00 degrees N and 29.00 degrees N and more subadult individuals at 28.50 degrees N in autumn, exhibiting different growth rates and resource densities. In addition, we found the majority of the catches were composed of parent groups in spring, while in autumn, the majority of the catches were composed of juvenile groups. We concluded that the subadult groups might have dispersed widely for feeding and growth along the latitude of 30.00 degrees N and to the south in summer, and the southern area of the Yangtze River extending north was the spawning ground in spring. The groups of S. esculenta preferred to stay in areas with a stable water temperature of similar to 20.00 degrees C, and many S. esculenta juveniles might have adapted to endure the negative influence of the low oxygen content in summer. The depth range of the S. esculenta population was 10.00-133.00 m from spring to autumn, but this shrank to 66.00-107.00 m in winter. The golden cuttlefish (Sepia esculenta) is an important cephalopod species with a lifespan of approximately one year. The species plays a crucial role in marine ecological support services and is commercially valuable in fisheries. In the seas around China, this species has emerged as the main target for cuttlefish fisheries, replacing Sepiella maindroni since the 1990s. Variations in oceanographic conditions associated with global warming could significantly impact the temporal-spatial distribution of the species. In this study, we performed bottom trawling surveys with four cruises during 2018-2019 in the East China Sea region to determine the current resource status and seasonal-spatial variations in S. esculenta. We found that the average individual weight (AIW) values were 4.87 and 519.00 g/ind at stations located at 30.50 degrees N, 124.00 degrees E and 30.50 degrees N, 124.50 degrees E, respectively, with the aggregation of larvae and parent groups in spring. The species was not distributed north of 32.00 degrees N in summer. The catch per unit effort by weight (CPUEw) value decreased in the order of 2772.50 -> 2575.20 -> 503.29 -> 124.36 g/h, corresponding to latitudes of 34.50 degrees N -> 34.00 degrees N -> 33.50 degrees N -> 32.50 degrees N 121.50 degrees E in autumn. The most suitable fishing areas were the south of the East China Sea region in spring; the south of the East China Sea region extending to the center and outer parts of the East China Sea region in summer; the south of the Yellow Sea close to the Haizhou Bay fishing ground and the forbidden fishing line region of the Lusi and Dasha fishing grounds in autumn; and the south and center of the East China Sea region in winter. The most suitable sea bottom temperature (SBT) values from spring to winter were 14.76-20.53 degrees C, 19.54-22.98 degrees C, 11.79-17.64 degrees C, and 16.94-20.36 degrees C, respectively. The most suitable sea bottom salinity (SBS) values were 31.53-34.80 parts per thousand in spring, 32.95-34.68 parts per thousand in summer, 31.51-34.77 parts per thousand in autumn, and 33.82-34.51 parts per thousand in winter. We concluded the following: (1) the southern and northern areas of the East China Sea region are spawning and nursery grounds, respectively, in spring; (2) the central distribution is located at a latitude of 28.00 degrees N in autumn and winter; and (3) the southern area of the Yangtze River to the north is a spawning ground in spring, and the areas located at 29.00-34.50 degrees N, 124.00-124.50 degrees E, and 28.00-30.50 degrees N, 125.50-126.50 degrees E are nursery grounds. The results of this study provide useful guidance for appropriate fisheries management, thereby avoiding a collapse in the S. esculenta population, which has been experienced in other species in this area.

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