Updated 2020 horse mackerel assessments and projections

This document reports updated 2020 horse mackerel assessments, along with constant midwater catch projections for the base case model and seven model sensitivities. These models include exploring alternative values for natural mortality at age, and fixing 2015 and 2016 recruitment residuals to zero, and changing the values assumed for the catchability for Autumn survey and for the stock-recruitment steepness.