scholarly journals Increasing Occurrence of Atlantic Bluefin Tuna on Atlantic Herring Spawning Grounds: A Signal of Escalating Pelagic Predator–Prey Interaction?

2021 ◽  
Vol 13 (3) ◽  
pp. 240-252
Author(s):  
François Turcotte ◽  
Jenni L. McDermid ◽  
Tyler D. Tunney ◽  
Alex Hanke
Keyword(s):  
Bluefin Tuna ◽  
Atlantic Herring ◽  
Spawning Grounds ◽  
Predator Prey ◽  
Atlantic Bluefin Tuna ◽  
Prey Interaction

scholarly journals Predator–prey interactions in the face of management regulations: changes in Mediterranean small pelagic species are not due to increased tuna predation

2017 ◽  
Vol 74 (9) ◽  
pp. 1422-1430 ◽  
Author(s):  
Elisabeth Van Beveren ◽  
Jean-Marc Fromentin ◽  
Sylvain Bonhommeau ◽  
Anne-Elise Nieblas ◽  
Luisa Metral ◽  
...  
Keyword(s):  
Prey Species ◽  
Size Structure ◽  
Bluefin Tuna ◽  
Pelagic Fish ◽  
Fish Populations ◽  
Small Pelagic Fish ◽  
Predator Prey ◽  
Atlantic Bluefin Tuna ◽  
Management Measures ◽  
The Face

Recently, the abundance of young Atlantic bluefin tuna (Thunnus thynnus) tripled in the northwestern Mediterranean following effective management measures. We investigated whether its predation on sardine (Sardina pilchardus) and anchovy (Engraulis encrasicolus) could explain their concurrent size and biomass decline, which caused a fishery crisis. Combining the observed diet composition of bluefin tuna, their modelled daily energy requirements, their population size, and the abundance of prey species in the area, we calculated the proportion of the prey populations that were consumed by bluefin tuna annually over 2011–2013. To assess whether tuna could alter the size structure of the three small pelagic fish populations (anchovy, sardine, and sprat (Sprattus sprattus)), the size distributions of the consumed prey species were compared with those of the wild populations. We estimated that the annual consumption of small pelagic fish by bluefin tuna is less than 2% of the abundance of these populations. Furthermore, size selectivity patterns were not observed. We thus concluded that tuna predation is unlikely to be the main cause of major changes in the small pelagic fish populations from this area.

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 ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Gulf Of Mexico ◽  
Trophic Ecology ◽  
Bluefin Tuna ◽  
Spawning Grounds ◽  
Atlantic Bluefin Tuna ◽  
Nw Mediterranean ◽  
Isotope Study ◽  
Stable Isotope Study

Overlap between Atlantic bluefin tuna spawning grounds and observed Deepwater Horizon surface oil in the northern Gulf of Mexico

2012 ◽  
Vol 64 (4) ◽  
pp. 679-687 ◽  
Author(s):  
B.A. Muhling ◽  
M.A. Roffer ◽  
J.T. Lamkin ◽  
G.W. Ingram ◽  
M.A. Upton ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Bluefin Tuna ◽  
Deepwater Horizon ◽  
Spawning Grounds ◽  
Northern Gulf Of Mexico ◽  
Atlantic Bluefin Tuna

scholarly journals Correction: 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 (9) ◽  
pp. e0138638 ◽  
Author(s):  
Raúl Laiz-Carrión ◽  
Trika Gerard ◽  
Amaya Uriarte ◽  
Estrella Malca ◽  
José María Quintanilla ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Gulf Of Mexico ◽  
Trophic Ecology ◽  
Bluefin Tuna ◽  
Spawning Grounds ◽  
Atlantic Bluefin Tuna ◽  
Nw Mediterranean ◽  
Isotope Study ◽  
Stable Isotope Study

Tracking the fidelity of Atlantic bluefin tuna released in Canadian waters to the Gulf of Mexico spawning grounds

2015 ◽  
Vol 72 (11) ◽  
pp. 1700-1717 ◽  
Author(s):  
Steven G. Wilson ◽  
Ian D. Jonsen ◽  
Robert J. Schallert ◽  
James E. Ganong ◽  
Michael R. Castleton ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Fork Length ◽  
Bluefin Tuna ◽  
Deepwater Horizon ◽  
Series Data ◽  
Spawning Grounds ◽  
Atlantic Bluefin Tuna ◽  
Drilling Rig ◽  
Archival Tags ◽  
The Mean

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.

Active prey selection in developing larvae of Atlantic bluefin tuna (Thunnus thynnus) in spawning grounds of the Gulf of Mexico

2021 ◽  
Author(s):  
Akihiro Shiroza ◽  
Estrella Malca ◽  
John T Lamkin ◽  
Trika Gerard ◽  
Michael R Landry ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Prey Selection ◽  
Bluefin Tuna ◽  
Gut Contents ◽  
Physical Factors ◽  
Larval Rearing ◽  
Thunnus Thynnus ◽  
Small Copepod ◽  
Atlantic Bluefin Tuna ◽  
Larval Stages

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.

Regional variation in the otolith chemistry of age‐0 atlantic bluefin tuna from nurseries in the mediterranean sea

2021 ◽  
Author(s):  
Anna Traina ◽  
Enza Quinci ◽  
Igaratza Fraile ◽  
Isik K. Oray ◽  
Haritz Arrizabalaga ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Regional Variation ◽  
Bluefin Tuna ◽  
Otolith Chemistry ◽  
Atlantic Bluefin Tuna ◽  
The Mediterranean
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