Stock assessment of Uroteuthis edulis in the East China Sea based on spawning potential ratio

文献类型： 外文期刊

第一作者： Guo, Rongpei

作者： Guo, Rongpei;Fang, Zhou;Han, Qingpeng;Fang, Zhou;Fang, Zhou;Fang, Zhou

作者机构：

关键词： East China Sea; Uroteuthis edulis; Spawning potential ratio; Fecundity; Individual condition

期刊名称：FISHERIES SCIENCE （ 影响因子：1.4； 五年影响因子：1.8 ）

ISSN： 0919-9268

年卷期： 2025 年 91 卷 4 期

页码：

收录情况： SCI

摘要： The spawning potential ratio (SPR) is a commonly used biological reference point that provides information for decision-making regarding fisheries management. Based on bottom trawl survey data conducted in the East China Sea from November 2021 to March 2022 and from September 2022 to March 2023, we analyzed the effects of individual condition on the potential fecundity of Uroteuthis edulis (common name swordtip squid) and estimated the SPR under different management scenarios using a mantle length-based per-recruit model. In this study, we examined the influence of individual condition on management reference points using the body condition index (CI) and reproductive investment index (RI) as indicators. The results showed that the potential fecundity increased with the growth of mantle length and increased CI and RI, while the relative fecundity of body weight decreased with gain in body weight, highlighting the impact of mantle length and individual condition on potential fecundity. Under the current exploitation rate (0.595/year), the SPR was estimated to be 0.327, indicating that U. edulis in the East China Sea might have been experiencing mild recruitment overfishing during the study period, which could have had a certain impact on the population's recruitment. When SL50% (ML corresponding to a 50% selection rate) exceeded 95 mm, the SPR would exceed 0.4, suggesting the ML of the first capture was 95 mm; based on this result, we recommend considering an appropriate reduction in fishing intensity and fishing gear mesh size for U. edulis. Also, changes in individual condition influenced the estimation of related biological reference points. When SL50% was 95 mm, F40% (instantaneous fishing mortality rate corresponding to 40% of the unfished spawning stock biomass) decreased by 3.55% and 15.44% for CI ranging from - 1.5 to 4.5 and RI index ranging from - 2 to 6, respectively. Due to variations in individual condition, using spawning stock biomass to calculate F40% may introduce a deviation of 10.77%. Therefore, the results of this study emphasize the importance of monitoring potential fecundity and changes in individual condition in fisheries assessments, as these would contribute to sound management of data-limited fisheries.

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