Download FAR 2023/13 Spatial-temporal standardisation of commercial longline and trawl survey catches of ling (Genypterus blacodes) on the Chatham Rise (LIN 3&4)

The trends of the ling trawl survey biomass and CPUE of commercial longline fisheries on the Chatham Rise (LIN 3&4) were different in the 1990s. Standardisation accounting for spatial and temporal structure of the fisheries and the underlying ling population resulted in a small change compared with the non-spatial longline CPUE trend and an almost identical trend for the survey biomass in the core area. Although spatial standardisation was important, it was not able to reconcile the indices.