TITLE:
Correction of “Case Study: A Simulation Model of the Spawning Stock Biomass of Pacific Bluefin Tuna and Evaluation of Fisheries”
AUTHORS:
Kazumi Sakuramoto
KEYWORDS:
Bluefin Tuna, Stock-Recruitment Relationship, Environmental Factors
JOURNAL NAME:
Open Access Library Journal,
Vol.4 No.4,
April
28,
2017
ABSTRACT: One error was found in the
coding of the simulation program for reproducing the recruitment
(R) and spawning stock biomass (SSB) of Pacific bluefin tuna. As a result of this error, the
maturity rates for ages 3 and 4 were found to be much lower in the simulation than the true values. The aim of this paper is to
show the results when the error is corrected. The R and SSB were under-estimated in response to the error. As a result, the natural mortality
coefficients (M) in the
previous paper were assumed to be smaller so that the reproduced R and SSB would coincide with those observed. When the error was
corrected, it was not necessary to assume the value of M to be smaller. When the corrected progam and the original M values were used, the R and SSB reproduced in the simulation coincided well with those shown in
the previous paper.