1.College of Marine Sciences，Shanghai Ocean University，Shanghai 201306，China；2.Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources，Ministry of Education，Shanghai 201306，China；3.Key Laboratory of Oceanic Fisheries Exploration，Ministry of Agriculture and Rural Affairs，Shanghai 201306，China
Abstract: The fishery of Western and Central Pacific Ocean skipjack tuna (Katsuwonuspelamis) (refer to WCPO SKJ) is divided into 8 management areas and 31 fleets in order to assess the status of the WCPO SKJ, and to explore the impact of migration patterns on skipjack tuna stock assessment. This paper focuses on the migration patterns of skipjack tuna population by season and uses age structure model Stock Synthesis 3(SS3), setting four different scenarios to simulate and analyze the migration patterns of skipjack tuna at different age stages. The stock assessment result shows that the WCPO SKJ is neither overfished (Bcur/B40%=1.9>1), nor undergoing overfishing (Fcur/F40%=0.712<1). Sensitivity analysis shows that the steepness parameter (h) strongly influences the assessment results. The higher the h value is, the more optimistic the assessment results become. Considering seasonal migration can significantly impact the stock assessment results, if the model ignores migration patterns, the impact of fishing on the stock will be underestimated. The findings indicate that consideration of seasonal and age migration in the stock assessment is a better reflection of skipjack tuna population dynamics.
黄雨辰, 耿喆, 冯佶, 石一茜, 朱江峰. 结合洄游模式的中西太平洋鲣资源评估[J]. 大连海洋大学学报, 2023, 38(4): 652-662.
HUANG Yuchen, GENG Zhe, FENG Ji, SHI Yixi, ZHU Jiangfeng. Incorporating the migration patterns in stock assessment of Western and Central Pacific Ocean skipjack tuna (Katsuwonus pelamis). Journal of Dalian Ocean University, 2023, 38(4): 652-662.
2023, Vol. 38 
