Research on the Relationship between Marine Environment with Seafood Exploitation Productivity and Catch per Unit Effort in the Upwelling Area of the South Central Coast of Vietnam

The analysis of the relationship between oceanographic and environmental factors and fish production and productivity reveals that during the Southwest monsoon season, fish production and productivity are typically higher and more variable compared to the Northeast monsoon season. These metrics exhibit a relatively strong relationship with oceanographic structural variables, with a multiple correlation coefficient of R₀ = 0.56 during the Southwest monsoon season, which decreases to R₀ = 0.4 in the Northeast monsoon season. Specifically, fish production and productivity show a positive correlation with seawater temperature during the Northeast monsoon season, a negative correlation during the Southwest monsoon season, and a negative correlation with salinity in both seasons. Multivariate regression analysis further highlights a significant relationship between marine resource productivity and various oceanographic and environmental factors. Notably, factors such as Tday (Bottom Water Temperature), H0, PHY (Phytoplankton), and ZOO (Zooplankton) demonstrate high pairwise correlation coefficients with fish production and are positively correlated with each other. Additionally, fishing productivity peaks in areas with low flow speeds (20-40 cm/s) and regions characterized by alternating cyclonic and anticyclonic circulations.