Stock assessment of bigeye tuna in the Western and Central Pacific Ocean by using Production model
Date Issued
2007
Date
2007
Author(s)
Chin, Chi-Hsiang
DOI
zh-TW
Abstract
This paper tries to assess the exploitation of bigeye tuna, Thunnus obesus, in the western and centeral Pacific by using catch statistics longline fisheries collected by Overseas Fisheries Development Council of Republic of China and WCPFC (Western and Central Pacific Fisheries Commission).
First, the nominal effort was converted to effective effort by Honma method. Then, the effective effort was fitted by production models: Schaefer model, Fox model and Pella-Tomlinson model. At last, based on the results of these models: MSY (maximum sustainable yield) and fMSY were calculated for fishery management as Schaefer model: MSY=155,380 tons; fMSY=478,218 (10,000 hooks), Fox model: MSY=129,955 tons; fMSY=525,431 (10,000 hooks), Pella-Tomlinson model when m=1.483: MSY=141,935 tons; fMSY=488,591 (10,000 hooks), respectively.
Compared MSY estimated by production model with MULTIFAN-CL by Hampton, 40,000-80,000 tons in 2003 which was quite lower than that by production model. Recently, the total yield of bigeye tuna in the western and centeral Pacific was increasing. In 2005, the yield reached up to 157,000 tons. If we adopted MSY from MULTIFAN-CL, we supported to use tuna in western and centeral Pacific seems to be overfishing. Pella-Tomlinson model with m=1.483 as the optimum way to regulate the bigeye tuna stock in the western and centeral Pacific.
Subjects
大目鮪
Honma法
生產量模式
最大永續生產量(MSY)
fMSY
bigeye tuna
Honma method
production model
MSY
SDGs
Type
thesis