scholarly journals Trophic Ecology of Atlantic Bluefin Tuna (Thunnusthynnus) Larvae from the Gulf of Mexico and NW Mediterranean Spawning Grounds: A Comparative Stable Isotope Study

PLoS ONE ◽  
2015 ◽  
Vol 10 (7) ◽  
pp. e0133406 ◽  
Author(s):  
Raúl Laiz-Carrión ◽  
Trika Gerard ◽  
Amaya Uriarte ◽  
Estrella Malca ◽  
José María Quintanilla ◽  
...  
2011 ◽  
Vol 91 (4) ◽  
pp. 502-510 ◽  
Author(s):  
Benoit Lebreton ◽  
Pierre Richard ◽  
Emmanuel P. Parlier ◽  
Gaël Guillou ◽  
Gérard F. Blanchard

2015 ◽  
Vol 72 (11) ◽  
pp. 1700-1717 ◽  
Author(s):  
Steven G. Wilson ◽  
Ian D. Jonsen ◽  
Robert J. Schallert ◽  
James E. Ganong ◽  
Michael R. Castleton ◽  
...  

The objective of this study was to advance the use of pop-up satellite archival tags to track the migrations of Atlantic bluefin tuna (Thunnus thynnus) to their spawning grounds. Deployment of tags occurred in the Gulf of St. Lawrence, Canada, during fall months from 2007 to 2013. Pop-up satellite archival tags (n = 135) were attached to 125 Atlantic bluefin tuna (curved fork length (CFL) = 268 ± 20 cm (mean ± SD)) with the objective of keeping tags on until visitation to a spawning area or longer. A dataset of 18 800 days was acquired, which included 5800 days of time-series data from 19 recovered satellite tags. Many Atlantic bluefin tuna visited the Gulf of Mexico spawning grounds (74%), the mean size of which was 275 ± 14 cm (CFL ± SD, n = 49), with a measured CFL of 243 to 302 cm. These fish had a mean entry date into the Gulf of Mexico of 14 January ± 42 days (SD). The mean residency period for fish that had tracks with entrance and exit from the Gulf of Mexico was 123 ± 49 days (SD) (n = 22). Atlantic bluefin tuna that moved into the Gulf of Mexico during the spawning season remained west of the 45°W meridian for the duration of the track. Electronic tagging datasets from two fish were obtained before, during, and after the Deepwater Horizon oil spill. Both fish utilized habitat in the vicinity of the Macondo Well on 20 April 2010 when the Deepwater Horizon oil drilling rig accident occurred. Spawning hotspots are identified in the Gulf of Mexico using kernel density analyses and compared with the newly established closed areas.


2018 ◽  
Author(s):  
Nicholas D. Udy ◽  
◽  
Serena Smith ◽  
McKenzie M. Ranney ◽  
Michael Andrews ◽  
...  

Author(s):  
Akihiro Shiroza ◽  
Estrella Malca ◽  
John T Lamkin ◽  
Trika Gerard ◽  
Michael R Landry ◽  
...  

Abstract Bluefin tuna spawn in restricted areas of subtropical oligotrophic seas. Here, we investigate the zooplankton prey and feeding selectivity of early larval stages of Atlantic bluefin tuna (ABT, Thunnus thynnus) in larval rearing habitat of the Gulf of Mexico. Larvae and zooplankton were collected during two multi-day Lagrangian experiments during peak spawning in May 2017 and 2018. Larvae were categorized by flexion stage and standard length. We identified, enumerated and sized zooplankton from larval gut contents and in the ambient community. Ciliates were quantitatively important (up to 9%) in carbon-based diets of early larvae. As larvae grew, diet composition and prey selection shifted from small copepod nauplii and calanoid copepodites to larger podonid cladocerans, which accounted for up to 70% of ingested carbon. Even when cladoceran abundances were <0.2 m−3, they comprised 23% of postflexion stage diet. Feeding behaviors of larvae at different development stages were more specialized, and prey selection narrowed to appendicularians and primarily cladocerans when these taxa were more abundant. Our findings suggest that ABT larvae have the capacity to switch from passive selection, regulated by physical factors, to active selection of presumably energetically optimal prey.


2007 ◽  
Vol 23 (2-3) ◽  
pp. 242-255 ◽  
Author(s):  
Evandro L. Klein ◽  
Chris Harris ◽  
André Giret ◽  
Candido A.V. Moura

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