Genetically Distinct Skipjack Tuna Subpopulations Appeared in the Central and the Western Pacific Ocean

Stock assessment of skipjack tuna in the western and central Pacific Ocean

Weight–length relationships and Fulton’s condition factors of skipjack tuna (Katsuwonus pelamis) in the western and central Pacific Ocean

This paper describes the weight-length relationships (WLRs) and Fulton's condition factors (K) of skipjack tuna (Katsuwonus pelamis) in purse seine fisheries from three cruises in the western and central Pacific Ocean (WCPO): August-September 2009 (AS09), November-December 2012 (ND12), and June-July 2013 (JJ13). The fork length and weight of a total of 1678 specimens were measured. The results ...

Cpue Standardisation for Bigeye and Yellowfin Tuna in the Western and Central Pacific Ocean

Executive summary Indices of catch per unit effort are presented for bigeye and yellowfin tuna in the WCPO from 1952 to 2009, based on analyses of aggregated Japanese distant water longline data. One change was made to the methods for estimating indices of abundance for the bigeye and yellowfin stock assessments, with removal of the targeting indicator based on CPUE of other species. This chang...

Oceanographic regime shifts and tuna recruitment in the western and central Pacific Ocean

This analysis aims to establish whether the ‘regime shifts’ documented for the north Pacific Ocean are seen in the western and central Pacific Ocean (WCPO) and are relevant to recruitment variation for tropical tunas. Quantitative indicators of oceanographic state are derived by multivariate analysis of physical and biological variables output from an ocean general circulation and biogeochemica...

Stock assessment of bigeye tuna in the western and central Pacific Ocean