A SPiCT assessments of the north Atlantic shortfin mako shark

The 2017 ICCAT stock assessment for north Atlantic shortfin mako shark suggested a substantial deterioration of the estimated stock status compared with the previous assessments in 2008 and 2012. The ICCAT stock assessments were based on surplus production models (ASPIC and several implementations of Bayesian surplus production models) and Stock Synthesis 3 (SS3) was also used in the 2017 assessment. In this paper, we have applied a newly developed surplus production model in continuous time that the International Council for the Exploration of the Sea (ICES) has used to provide advice on stocks where only catch and one or more indices of stock size are available.