An uncertainty-based decision support tool to evaluate the southern king crab (Lithodes santolla) fishery in a scarce information context

•Small scale fisheries management must considering the uncertainty associated to available data.•Whereas uncertainty comes out to be large, a precautionary approach should be adopted.•Our tool identifies and quantifies the uncertainty linked with the reported harvested biomass.•Fishing pressure on southern king crab is underestimated due to bias in the datasets.•The presented maps constitute a valid support tool for informing resource management.