Vertical Movements and Habitat Utilization of Skipjack (Katsuwonus pelamis), Yellowfin (Thunnus albacares), and Bigeye (Thunnus obesus) Tunas in the Equatorial Eastern Pacific Ocean, Ascertained Through Archival Tag Data

2009 ◽  
pp. 121-144 ◽  
Author(s):  
Kurt M. Schaefer ◽  
Daniel W. Fuller ◽  
Barbara A. Block
Keyword(s):  
Pacific Ocean ◽  
Habitat Utilization ◽  
Eastern Pacific ◽  
Thunnus Albacares ◽  
Eastern Pacific Ocean ◽  
Katsuwonus Pelamis ◽  
Vertical Movements ◽  
Archival Tag ◽  
Thunnus Obesus

scholarly journals Evaluation of a fishing captain's ability to predict species composition, sizes, and quantities of tunas associated with drifting fish-aggregating devices in the eastern Pacific Ocean

2014 ◽  
Vol 71 (7) ◽  
pp. 1774-1780 ◽  
Author(s):  
Daniel W. Fuller ◽  
Kurt M. Schaefer
Keyword(s):  
Pacific Ocean ◽  
Species Composition ◽  
Eastern Pacific ◽  
Purse Seine ◽  
Thunnus Albacares ◽  
Eastern Pacific Ocean ◽  
Mixed Species ◽  
Katsuwonus Pelamis ◽  
Thunnus Obesus ◽  
Fish Aggregating Devices

Abstract Experiments were conducted to evaluate a fishing captain's ability to predict species composition, sizes, and quantities of tunas associated with drifting fish-aggregating devices (FADs), before encirclement with a purse-seine net. Operating in the equatorial eastern Pacific Ocean, during 11 May–23 July 2011, Captain Ricardo Diaz detected small quantities of bigeye (Thunnus obesus) and yellowfin (Thunnus albacares) tunas within large FAD-associated aggregations dominated by skipjack tuna (Katsuwonus pelamis). The captain's predictions were significantly related to the actual total catch and catch by species, but not to size categories by species. His predictions of species composition were most accurate when estimates of bigeye and yellowfin tuna were combined. If purse-seine captains are able to make accurate predictions of the proportion of bigeye and yellowfin tunas present in mixed-species aggregations associated with FADs, managers may wish to consider incentives to fishers to reduce the fishing mortality on those species.

210Po Activity and Concentrations of Selected Trace Elements (As, Cd, Cu, Hg, Pb, Zn) in the Muscle Tissue of Tunas Thunnus albacares and Katsuwonus pelamis from the Eastern Pacific Ocean

2012 ◽  
Vol 149 (3) ◽  
pp. 371-376 ◽  
Author(s):  
Jorge Ruelas-Inzunza ◽  
Martín Federico Soto-Jiménez ◽  
Ana Carolina Ruiz-Fernández ◽  
Humberto Bojórquez-Leyva ◽  
Hascibe Pérez-Bernal ◽  
...  
Keyword(s):  
Trace Elements ◽  
Pacific Ocean ◽  
Muscle Tissue ◽  
Eastern Pacific ◽  
Thunnus Albacares ◽  
Eastern Pacific Ocean ◽  
Katsuwonus Pelamis ◽  
210Po Activity

Size-specific spatiotemporal dynamics of bigeye tuna (Thunnus obesus) caught by the longline fishery in the eastern Pacific Ocean

2021 ◽  
Vol 243 ◽  
pp. 106065
Author(s):  
Keisuke Satoh ◽  
Haikun Xu ◽  
Carolina V. Minte-Vera ◽  
Mark N. Maunder ◽  
Toshihide Kitakado
Keyword(s):  
Pacific Ocean ◽  
Spatiotemporal Dynamics ◽  
Eastern Pacific ◽  
Longline Fishery ◽  
Bigeye Tuna ◽  
Eastern Pacific Ocean ◽  
Thunnus Obesus

Evaluating fishery impacts: Application to bigeye tuna (Thunnus obesus) in the eastern Pacific Ocean

2009 ◽  
Vol 99 (2) ◽  
pp. 106-111 ◽  
Author(s):  
Sheng-Ping Wang ◽  
Mark N. Maunder ◽  
Alexandre Aires-da-Silva ◽  
William H. Bayliff
Keyword(s):  
Pacific Ocean ◽  
Eastern Pacific ◽  
Bigeye Tuna ◽  
Eastern Pacific Ocean ◽  
Thunnus Obesus

scholarly journals Pelagic longline fishery for albacore tuna (Thunnus alalunga) yellowfin tuna (Thunnus albacares) and bigeye tuna (Thunnus obesus) in the high seas of eastern Pacific ocean.

2018 ◽  
Author(s):  
Bruno Thierry Nyatchouba Nsangue ◽  
Zhou Cheng ◽  
Liuxiong Xu ◽  
Richard Kindong
Keyword(s):  
Pacific Ocean ◽  
Condition Factor ◽  
Yellowfin Tuna ◽  
Eastern Pacific ◽  
Bigeye Tuna ◽  
Eastern Pacific Ocean ◽  
Albacore Tuna ◽  
Thunnus Obesus ◽  
Hook Depth ◽  
High Seas

This study highlighted the occurrence of a pelagic long line fishery targeting albacore tuna, yellowfin tuna and bigeye tuna in the high seas of eastern Pacific Ocean. Species selectivity of the fishing method was assessed. Hook depth, statistics of at-vessel survival rate grouped by hooks number, length frequency, weight frequency, length weight relationship, relative condition factor and Fulton’s condition factor were estimated for the target species. This fishing method proved highly selective for albacore tuna, where catches accounted for about 85% of catches, while other resources such as yellowfin tuna amounted to 4.8% and big eye tuna accounted for 9.70%. The results showed that, fish size increased with deeper depths. Hook No. 8 located at a critical depth indicated that fork lengths of tuna registered above this depth were significantly smaller than that those captured below it. Logistic regression model suggested a significant effect of hook depth on the catch efficiency. The highest density of catch efficiency was located at the depth of 167.57 m. An alternative strategy showed that hooks deployed at the depths ranging from 124 to 211 m will result in a more considerable fishing efficiency. The analyses also showed that the relative condition factors (Krel) of the three fish species were greater than (1) implying that they were in good physiological condition at the time of capture.

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