The preliminary analysis of standardized CPUE for the catch data of blue shark by Japanese longliner using the finite mixture model

Citation
Kanaiwa M, Yamamoto A, Kai M (2021) The preliminary analysis of standardized CPUE for the catch data of blue shark by Japanese longliner using the finite mixture model. In: ISC 2021 2nd Shark Working Group Workshop. ISC/21/SHARKWG-2/02, Online, p 5
Abstract

The target effect, which is a problem in CPUE standardization, was addressed in latent variable estimation using a finite mixture model, and the stock indices of blue shark in the Northwest Pacific Ocean were estimated from Japanese longline fishery data. As a result, the models with latent variables 2-8 converged, and the trend of the stock index was similar in that there were peaks in 2005, 2017 and 2018, although there were minor differences among the models.