This paper represents the by-catch analysis results of a multi-Member longline survey on Patagonian toothfish (Dissostichus eleginoides) at Division 58.4.4b by France and Japan. The data set, C2 and scientific observer data, was provided by the CCAMLR Secretariat on the 3th August, 2018. In this paper, the C2 data from 2012/2013 to 2016/2017 fishing seasons was used for the analysis because scientific observers have ceased recording number and weight of bycatch fish with some lines. ANT (Antimora rostrata), GRV (Macrourus spp.), and RFA (Raja taaf) are common by-catch species, which are caught at both research blocks 58.4.4b_1 and 58.4.4b_2. These common by-catch species indicate some temporal change of their bycatch pattern.