Update of standardized CPUE of blue shark (Prionace glauca) in the Indian Ocean estimated from Japanese observer data between 1992 and 2015.

We updated the standardized CPUE of blue shark based on the Japanese observer data collected in the Indian Ocean
between 1992 and 2015. The model structure and procedure of the analysis are basically same with Kanaiwa et al. (2014)
and Semba et al. (2015). We modified the following points:
1) We added the observer data which was collected outside the traditional CCSBT observer program which was collected in the Indian Ocean
2) We added observer data with deep set and set operated in the tropical area.
3) We used observed total hook number instead of deployed total hook number as the effort.