plSSN : 0374-8111 | elSSN : 2287-8815
plSSN : 0374-8111 | elSSN : 2287-8815
plSSN : 0374-8111elSSN : 2287-8815
Fishing Characteristics of the Korean Tuna Purse Seine Fishery in theIndian Ocean Considering the Indian Ocean Dipole (IOD)
엄지현·박희원*·박정호·임정현·이미경·김희용·이성일1
국립수산과학원 원양자원과, 1국립부경대학교 해양생산시스템관리학부
This study analyzed the fishing characteristics of the Korean tuna purse seine fishery in the Indian Ocean considering the Indian Ocean Dipole (IOD). Logbook data collected from 2012 to 2025 and the Dipole Mode Index (DMI), an indicator of the IOD, were used for the analysis. School types were classified as fish aggregating device (FAD) and free-swimming school (FSC) sets. To account for delayed environmental effects, lagged DMI variables from 0 to 6 months were compared. The one-month lagged variable was identified as the most suitable based on model performance. A generalized additive model with a Tweedie distribution and log link function was used to assess the impacts of temporal, spatio-seasonal, environmental, and school-type variables. The results indicated that fishing patterns and environmental responses differed according to school type, and the influence of the IOD was stronger in the FAD than in the FSC sets. In particular, the FAD sets showed a decreasing catch per unit effort pattern under positive DMI conditions. These findings provide useful information for understanding the relationship between climate variability and fishing behavior, thereby contributing to climate-responsive fishery management.
Fishing characteristics, Tuna purse seine fishery, Indian Ocean Dipole, Generalized Additive Model