Abstract:
:Age and growth parameters were estimated for bigeye tuna Thunnus obesus Lowe, 1839 sampled from China longline fisheries in the central Atlantic Ocean from October 2002 to July 2003 and from August 2004 to March 2005. The von Bertalanffy growth parameters were estimated at L(infinity)=217.9 cm fork length, k=0.23 year(-1), and t(0)=-0.44 year. The total mortality rate (Z) was estimated to be from 0.82 to 1.02, the fishing mortality (F) and the natural mortality were 0.54 year(-1) and 0.39 year(-1), respectively. The exploitation ratio (E) was 0.35. This study provides the detailed estimates of growth and mortality rate for bigeye tuna in the central Atlantic Ocean, which can be used as biological input parameters in further stock evaluations in this region. However, age analysis, additional validation of the size composition and stock structure are needed for future studies.
journal_name
Rev Biol Tropjournal_title
Revista de biologia tropicalauthors
Zhu G,Xu L,Zhou Y,Chen Xdoi
10.15517/rbt.v57i1-2.11292subject
Has Abstractpub_date
2009-03-01 00:00:00pages
79-88issue
1-2eissn
0034-7744issn
2215-2075journal_volume
57pub_type
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journal_title:Revista de biologia tropical
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