Japanese survey biomass index of Pacific saury up to 2022 using VAST model
Vector Autoregressive Spatio-temporal (VAST) model was applied to Japanese fishery-independent survey data to predict Pacific saury distribution and estimate biomass index from 2003 to 2022. The estimated biomass index from the selected VAST model with minimum AIC indicated similar year trends with the index from a design-based approach. The estimated biomass index dropped to the historical lowest in 2020 since 2003 and recovered but remained at a low level in 2022.
Document Number
NPFC-2022-SSC PS09-WP07 (Rev. 1)
Document Version
1
Agenda Item
Review of results of abundance estimation including 2022 Japanese biomass survey