Update on the conditioning of an operating model and model inspection for the Indian Ocean swordfish

This document presents the current status of development of an Operating Model for the Indian Ocean swordfish
(Xiphias gladius) stock. It explores the role of the structural uncertainty in the current stock assessment by means
of a grid of SS3 model fits. The current grid results in 2295 alternative population trajectories and productivity
estimates. A subset of 2401 model runs is proposed to compose the base case OM, these runs were explored regarding
the eects on several indicators and residual analysis of CPUE indices and stock-recruitment relationship. Cluster
analysis was performed to identify model runs with similar population trajectories in order to decrease the number
of runs included in the OM, as currently 2401 runs are too computationally demaning.