Analysis of the fishing intensity and management status of Anguilla japonica fry in the north coast of the Yangtze River Estuary- based on BeiDou VMS data and licenses data

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research Pub Date : 2025-05-15 DOI:10.1016/j.fishres.2025.107406

Chengbin Zhang , Ying Xiong , Dade Song , Hushun Zhang , Shuyan Wang , Zhongjie Kang , Long Liang

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引用次数: 0

Abstract

The Japanese eel (Anguilla japonica) is one of the Red List of Threatened Species as an “endangered” species in the International Union for Conservation of Nature (IUCN). This study focused on analysing the fishing characteristics of fishing vessels targeting Japanese eel fry (glass eels) within Chinese waters and examining current management practices for this species. We analyzed the fishing behavior of 497 vessels along the north coast of the Yangtze River Estuary using data from the BeiDou Vessel Monitoring System (VMS). Key study insights included the following. (1) The correspondence between vessels' actual fishing range and licensed-designated fishing zones was approximately 48.6 %. (2) The observed fleets mainly fell into two operational categories: Single-vessel (a single vessel fishing independently, SV), representing 15.1 % of the fleets, and Primary-secondary-vessel (where a primary-vessel carries one to three secondary-vessels to the fishing area, anchors, and releases the secondary-vessels to fish independently, PSV), representing 84.9 %. (3) For SVs, fishing areas are categorised into one, two, and more than three areas. (4) Fishing areas varied by vessel size: vessels under 12 m primarily operated in offshore waters at 0–20 m depths, and those over 24 m operated in deeper offshore waters at depths of 20–40 m. In comparison, vessels between 12 and 24 m were located in intermediate areas. (5) Fishing intensity varied significantly across regions, with the highest concentration observed in coastal waters at 0–20 m depth off Rudong waters and Dongtai waters, where fishing density reached 13–18 vessels/100 km². (6) Since the implementation of the Yangtze River Estuary Fishing Ban Zone in 2021, the core fishing grounds of eel fry fishing has shifted from the Haimen at the Yangtze River Estuary to the Rudong and the Dongtai sea waters. Based on the aforementioned research outcomes, the following recommendations are proposed: 1) For PSVs, fishery management authorities should mandate the standardised installation of BeiDou VMS on secondary-vessels. 2) It is advisable to enact regulations stipulating the permissible quantity of fishing nets carried by vessels based on their specifications.

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长江口北岸日本鳗鲡鱼苗捕捞强度及管理现状分析——基于北斗VMS数据和许可证数据

日本鳗鲡（Anguilla japonica）是国际自然保护联盟（IUCN）濒危物种红色名录中的一种。本研究重点分析了中国海域捕捞日本鳗鱼苗（玻璃鳗）的渔船的捕捞特征，并考察了该物种的现行管理措施。利用北斗船舶监测系统（VMS）数据，对长江口北岸497艘渔船的捕捞行为进行了分析。主要的研究见解包括以下几点。(1)船舶实际渔场与许可指定渔区的对应度约为48.6 %。(2)观察到的船队主要分为单船（单船独立捕捞，SV）和主次船（主次船携带1 ~ 3艘副船到渔区抛锚，并释放副船独立捕捞，PSV）两类，占84.9 %。(3)对于sv，捕鱼区分为1区、2区和3区以上。(4)不同船舶尺寸的捕捞区域不同：12 m以下的船舶主要在0 ~ 20 m深度的近海作业，24 m以上的船舶主要在20 ~ 40 m深度的深海作业。相比之下，12至24 m之间的船只位于中间区域。(5)各区域捕捞强度差异显著，如东海域和东台海域0 ~ 20 m海域捕捞密度最高，捕捞密度达到13 ~ 18艘/100 km2；(6)自2021年实施长江口禁渔区以来，鳗鲡鱼苗捕捞的核心渔场由长江口海门向如东、东台海域转移。基于上述研究成果，提出以下建议：1)对于psv，渔业管理部门应强制二级船舶标准化安装北斗VMS。2)建议根据渔船的规格制定规定，规定渔船可携带的渔网数量。

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来源期刊

Fisheries Research 农林科学-渔业

CiteScore

4.50

自引率

16.70%

发文量

294

审稿时长

15 weeks

期刊介绍： This journal provides an international forum for the publication of papers in the areas of fisheries science, fishing technology, fisheries management and relevant socio-economics. The scope covers fisheries in salt, brackish and freshwater systems, and all aspects of associated ecology, environmental aspects of fisheries, and economics. Both theoretical and practical papers are acceptable, including laboratory and field experimental studies relevant to fisheries. Papers on the conservation of exploitable living resources are welcome. Review and Viewpoint articles are also published. As the specified areas inevitably impinge on and interrelate with each other, the approach of the journal is multidisciplinary, and authors are encouraged to emphasise the relevance of their own work to that of other disciplines. The journal is intended for fisheries scientists, biological oceanographers, gear technologists, economists, managers, administrators, policy makers and legislators.