Stock assessment of Pacific bluefin tuna Thunnus orientalis) by non-equilibrium global production model analysis
Date Issued
2008
Date
2008
Author(s)
Chung, Fong-Juing
Abstract
Pacific bluefin tuna (Thunnus orientalis) is a temperate tuna with highly economic value. The exploitation of Pacific bluefin tuna began in 1950s and was mainly utilized by Japan, Korea, Taiwan, United States of America and Mexico in the North Pacific Ocean and the fishing methods are mainly purse seine, longline, troll, pole and line, set net and trawl. In this study, I gathered catch and CPUE data of these fisheries from 1952 to 2006 and used the non-equilibrium production model for stock assessment of T. orientalis.he estimated maximum sustainable yield (MSY) by non-equilibrium production model is between 19,000 ~ 26,000 metric tons. From projection results, the biomass of T.orientalis would be closer or lower than biomass at MSY (B_MSY) and fishing mortality would exceed fishing mortality at MSY (F_MSY) if catch level greater than 18,000 MT. So suggest setting total allowance catch (TAC) of Pacific bluefin tuna smaller than 18,000 metric tons.
Subjects
Pacific bluefin tuna
non-equilibrium production model
maximum sustainable yield
total allowance catch
SDGs
Type
thesis
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