Chub mackerel biology information from Song Hang survey in the Northwest Pacific from 2021 to 2024

From 2021 to 2024, Shanghai Ocean University conducted comprehensive fishery surveys using the RV Song Hang in the Northwest Pacific. A total of 3,801 Chub mackerel samples were collected from this survey. This document presents some preliminary analysis of the length frequency, growth, and sex ratio of Chub mackerel in the high seas. More studies are in progress, e.g. age determination, growth and mortality estimation considering temporal heterogeneity, and spatial distribution considering environmental influence. This ongoing survey could be a potential data sources for estimating the life history traits and supporting future stock assessment, offering critical insights into the population dynamics of this species within the convention area.