Either stock_re or stock with name_parts if that's done
Dirichlet, with worked example of externally estimated parameters.
2 components for prey size & prey species composition.
Timeseries indices of overlap (~area model), how much prey is available to predator in that year: Use delta in g3_suitability_exponential() / andersen p2
g3_suitability_exponential()/ andersen p2