Horizontal movements, utilization distributions, and mixing rates of yellowfin tuna ( Thunnus albacares ) tagged and released with archival tags in six discrete areas of the eastern and central Pacific Ocean

2021 ◽  
Author(s):  
Kurt M. Schaefer ◽  
Daniel W. Fuller
Keyword(s):  
Pacific Ocean ◽  
Yellowfin Tuna ◽  
Thunnus Albacares ◽  
Central Pacific ◽  
Central Pacific Ocean ◽  
Archival Tags ◽  
Mixing Rates ◽  
Utilization Distributions

A spatially disaggregated, length-based, age-structured population model of yellowfin tuna (Thunnus albacares) in the western and central Pacific Ocean

2001 ◽  
Vol 52 (7) ◽  
pp. 937 ◽  
Author(s):  
John Hampton ◽  
David A. Fournier
Keyword(s):  
Pacific Ocean ◽  
Yellowfin Tuna ◽  
Growth Patterns ◽  
Thunnus Albacares ◽  
Central Pacific ◽  
Data Set ◽  
Structured Population Model ◽  
Central Pacific Ocean ◽  
Age Structured ◽  
The Impact

A spatially disaggregated, length-based, age-structured model for yellowfin tuna (Thunnus albacares) in the western and central Pacific Ocean is described. Catch, effort, length-frequency and tagging data stratified by quarter (for the period 1962–99), seven model regions and 16 fisheries are used in the analysis. The model structure includes quarterly recruitment in each region, 20 quarterly age classes, independent growth patterns for juveniles and adults, structural time-series variation in catchability for all non-longline fisheries, age-specific natural mortality, and age-specific movement among the model regions. Acceptable fits to each component data set comprising the log-likelihood function were obtained. The model results suggest that declines in recruitment, and as a consequence, population biomass, have occurred in recent years. Although not obviously related to over-exploitation, the recruitment decline suggests that the productivity of the yellowfin tuna stock may currently be lower than it has been previously. Recent catch levels appear to have been maintained by increases in fishing mortality, possibly related to increased use of fish aggregation devices in the purse-seine fishery. A yield analysis indicates that average catches over the past three years may have slightly exceeded the maximum sustainable yield. The model results also reveal strong regional differences in the impact of fishing. Such heterogeneity in the fisheries and the impacts on them will need to be considered when future management measures are designed.

scholarly journals Correction: Distinct Yellowfin Tuna (Thunnus albacares) Stocks Detected in Western and Central Pacific Ocean (WCPO) Using DNA Microsatellites

PLoS ONE ◽  
2015 ◽  
Vol 10 (12) ◽  
pp. e0144568
Author(s):  
Roselyn D. Aguila ◽  
Sweedy Kay L. Perez ◽  
Billy Joel N. Catacutan ◽  
Grace V. Lopez ◽  
Noel C. Barut ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Yellowfin Tuna ◽  
Thunnus Albacares ◽  
Dna Microsatellites ◽  
Central Pacific ◽  
Central Pacific Ocean

scholarly journals Distinct Yellowfin Tuna (Thunnus albacares) Stocks Detected in Western and Central Pacific Ocean (WCPO) Using DNA Microsatellites

PLoS ONE ◽  
2015 ◽  
Vol 10 (9) ◽  
pp. e0138292 ◽  
Author(s):  
Roselyn D. Aguila ◽  
Sweedy Kay L. Perez ◽  
Billy Joel N. Catacutan ◽  
Grace V. Lopez ◽  
Noel C. Barut ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Yellowfin Tuna ◽  
Thunnus Albacares ◽  
Dna Microsatellites ◽  
Central Pacific ◽  
Central Pacific Ocean

scholarly journals Influence of oceanographic variability on recruitment of yellowfin tuna (Thunnus albacares) in the western and central Pacific Ocean

2009 ◽  
Vol 66 (9) ◽  
pp. 1462-1477 ◽  
Author(s):  
Adam Langley ◽  
Karine Briand ◽  
David Seán Kirby ◽  
Raghu Murtugudde
Keyword(s):  
Pacific Ocean ◽  
Stock Assessment ◽  
Equatorial Region ◽  
Yellowfin Tuna ◽  
Assessment Model ◽  
Thunnus Albacares ◽  
Central Pacific ◽  
Central Pacific Ocean ◽  
Oceanographic Variables ◽  
Recruitment Model

Recruitment estimates for yellowfin tuna ( Thunnus albacares ) in the western and central Pacific Ocean (WCPO), derived from a stock assessment model, are highly variable seasonally, interannually, and over decadal periods. A generalized linear model (GLM) was developed that predicts the variation in yellowfin tuna recruitment in response to a range of oceanographic variables. The GLM model accounted for 54% of the variation in quarterly recruitment for the period 1980–2003, with the inclusion of seven different oceanographic variables derived from a zone within the northwestern equatorial region of the WCPO. The robustness of the recruitment model was investigated by cross-validation. The GLM was complemented by a cluster analysis approach that identified five principal oceanographic states within the northwestern zone selected by the GLM. Incorporation of the recent GLM recruitment indices in the yellowfin tuna stock assessment model is likely to improve the precision of estimates of current and projected (next 1–2 years) biomass and exploitation rates. In a broader context, the recruitment model provides a tool to investigate how yellowfin tuna recruitment might vary in response to short- and long-term variation in the oceanographic conditions of the WCPO.

scholarly journals Movements, dispersion, and mixing of bigeye tuna (Thunnus obesus) tagged and released in the equatorial Central Pacific Ocean, with conventional and archival tags

2015 ◽  
Vol 161 ◽  
pp. 336-355 ◽  
Author(s):  
Kurt Schaefer ◽  
Daniel Fuller ◽  
John Hampton ◽  
Sylvain Caillot ◽  
Bruno Leroy ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Bigeye Tuna ◽  
Central Pacific ◽  
Central Pacific Ocean ◽  
Thunnus Obesus ◽  
Archival Tags

scholarly journals Erratum to: Genetic Population Structure of Thunnus albacares in the Central Pacific Ocean Based on mtDNA COI Gene Sequences

2015 ◽  
Vol 53 (9-10) ◽  
pp. 280-280
Author(s):  
Weiwen Li ◽  
Xinjun Chen ◽  
Qianghua Xu ◽  
Jiangfeng Zhu ◽  
Xiaojie Dai ◽  
...  
Keyword(s):  
Population Structure ◽  
Pacific Ocean ◽  
Genetic Population Structure ◽  
Coi Gene ◽  
Thunnus Albacares ◽  
Gene Sequences ◽  
Central Pacific ◽  
Genetic Population ◽  
Central Pacific Ocean ◽  
Mtdna Coi
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