scholarly journals Sexual maturity in western Atlantic bluefin tuna

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Gilad Heinisch ◽  
Hanna Rosenfeld ◽  
Jessica M. Knapp ◽  
Hillel Gordin ◽  
Molly E. Lutcavage
Keyword(s):  
Sexual Maturity ◽  
Bluefin Tuna ◽  
Western Atlantic ◽  
Atlantic Bluefin Tuna

Diet of young Atlantic bluefin tuna (Thunnus thynnus) in eastern and western Atlantic foraging grounds

2010 ◽  
Vol 158 (1) ◽  
pp. 73-85 ◽  
Author(s):  
John M. Logan ◽  
Enrique Rodríguez-Marín ◽  
Nicolas Goñi ◽  
Santiago Barreiro ◽  
Haritz Arrizabalaga ◽  
...  
Keyword(s):  
Bluefin Tuna ◽  
Thunnus Thynnus ◽  
Western Atlantic ◽  
Atlantic Bluefin Tuna

scholarly journals Erratum to: Diet of young Atlantic bluefin tuna (Thunnus thynnus) in eastern and western Atlantic foraging grounds

2011 ◽  
Vol 158 (9) ◽  
pp. 2147-2148 ◽  
Author(s):  
John M. Logan ◽  
Enrique Rodríguez-Marín ◽  
Nicolas Goñi ◽  
Santiago Barreiro ◽  
Haritz Arrizabalaga ◽  
...  
Keyword(s):  
Bluefin Tuna ◽  
Thunnus Thynnus ◽  
Western Atlantic ◽  
Atlantic Bluefin Tuna

Complex migration routes of Atlantic bluefin tuna (Thunnus thynnus) question current population structure paradigm

2010 ◽  
Vol 67 (6) ◽  
pp. 966-976 ◽  
Author(s):  
Benjamin Galuardi ◽  
François Royer ◽  
Walt Golet ◽  
John Logan ◽  
John Neilson ◽  
...  
Keyword(s):  
Site Fidelity ◽  
Bluefin Tuna ◽  
Thunnus Thynnus ◽  
Migration Routes ◽  
Western Atlantic ◽  
Spawning Period ◽  
Atlantic Bluefin Tuna ◽  
Spawning Site ◽  
Archival Tags ◽  
Spawning Areas

Movements of Atlantic bluefin tuna ( Thunnus thynnus , ABFT) from specific western Atlantic forage grounds are not well described, and the extent of their spawning areas is mainly surmised. In 2005 and 2006, we deployed 41 pop-up satellite archival tags (PSATs) on adult Atlantic bluefin tuna off the coast of Nova Scotia, Canada, and on Georges Bank. During the assumed spawning period, 56% of the tagged ABFT occupied a known spawning area, while 44% were located in distant oceanic regions. Assuming obligate annual spawning, these results are inconsistent with the notion of spawning site fidelity to the Gulf of Mexico. The ocean-wide migrations of adult ABFT tagged on a common forage ground suggest evidence of a metapopulation requiring more spatially explicit management than the current simple two-stock structure.

Atlantic bluefin tuna Thunnus thynnus feeding ecology in the northern Gulf of Mexico: a preliminary description of diet from the western Atlantic spawning grounds

2014 ◽  
Vol 86 (1) ◽  
pp. 365-374 ◽  
Author(s):  
C. M. Butler ◽  
J. M. Logan ◽  
J. M. Provaznik ◽  
E. R. Hoffmayer ◽  
M. D. Staudinger ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Feeding Ecology ◽  
Bluefin Tuna ◽  
Thunnus Thynnus ◽  
Spawning Grounds ◽  
Western Atlantic ◽  
Northern Gulf Of Mexico ◽  
Atlantic Bluefin Tuna ◽  
Preliminary Description

A Commentary on Western Atlantic Bluefin Tuna Assessments

1998 ◽  
Vol 127 (5) ◽  
pp. 838-855 ◽  
Author(s):  
Michael P. Sissenwine ◽  
Pamela M. Mace ◽  
Joseph E. Powers ◽  
Gerald P. Scott
Keyword(s):  
Bluefin Tuna ◽  
Western Atlantic ◽  
Atlantic Bluefin Tuna

Natal origin of Atlantic bluefin tuna (Thunnus thynnus) from Canadian waters based on otolith δ13C and δ18O

2010 ◽  
Vol 67 (3) ◽  
pp. 563-569 ◽  
Author(s):  
Ryan W. Schloesser ◽  
John D. Neilson ◽  
David H. Secor ◽  
Jay R. Rooker
Keyword(s):  
Eastern Mediterranean ◽  
Bluefin Tuna ◽  
Maximum Likelihood Estimates ◽  
Thunnus Thynnus ◽  
Western Atlantic ◽  
Atlantic Bluefin Tuna ◽  
Declining Populations ◽  
Catch Rates ◽  
And Migration ◽  
Stock Mixing

Increased knowledge of stock mixing and migration of Atlantic bluefin tuna ( Thunnus thynnus ) is required to properly manage and conserve declining populations. Here, we predicted the nursery origin of giant bluefin tuna (n = 224) present in samples from Canadian waters using stable δ13C and δ18O isotopes in otoliths. The isotopic composition of milled otolith cores (corresponding to the first year of life) of giant bluefin tuna from three decades (1970s, 1980s, 2000s) and three regions within or adjacent to the Gulf of St. Lawrence was compared with otolith δ13C and δ18O of yearling bluefin tuna collected from eastern (Mediterranean Sea – eastern Atlantic, n = 136) and western (western Atlantic, n = 103) nurseries. Maximum likelihood estimates indicated that greater than 99% of bluefin tuna in our Canadian samples originated from the western nursery. No significant differences in estimates of origin for bluefin tuna were detected among decades or among regions, suggesting little to no mixing of eastern and western populations in the Canadian samples examined. These findings justify the use of catch rates from the Gulf of St. Lawrence area as an index of abundance for the oldest members of the western population.

scholarly journals Multiple-Phase Biometric Relationships and Sexual Maturity in the Atlantic Bluefin Tuna, Thunnus thynnus (Osteichthyes: Scombridae)

Animals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 390
Author(s):  
Giambattista Bello ◽  
Nicoletta Santamaria ◽  
Aldo Corriero
Keyword(s):  
Sexual Maturity ◽  
Fork Length ◽  
Bluefin Tuna ◽  
Change Points ◽  
Growth Equation ◽  
Regression Equations ◽  
Body Proportion ◽  
Atlantic Bluefin Tuna ◽  
Multiple Phase ◽  
Section Surface

Most fish undergo distinct growth phases during ontogenesis. An extremely important passage from the juvenile to adult phase occurs at the onset of sexual maturity, which shows in body proportion and/or growth rate changes. These can be detected as change-points in biometric relationships. In this paper, the Atlantic bluefin tuna was analyzed to verify whether its somatic proportions show any sign of discontinuity during growth, i.e., whether any change-points may be detected in its somatic proportions. This fish has never been examined in this respect, and single-phase models, which are indeed easier to both compute and apply, are used in stock analyses. The following somatic relationships were analyzed in Atlantic bluefin tuna captured in the Mediterranean Sea between 1998 and 2010: “fork length–weight” regression, the von Bertalanffy growth equation, and “first dorsal spine cross section surface–fork length” regression. All of the examined relationships were found to be best modelled by multiple-phase regression equations, and all of them showed a change-point within the range of 101–110 cm fork length, which corresponds to 3–4 years of age. The present results, based on reproductive state-independent analyses, corroborate the disputed hypothesis that Atlantic bluefin tuna from the eastern stock in fact reproduce for the first time at this age.

Individual assignment of Atlantic bluefin tuna in the northwestern Atlantic Ocean using single nucleotide polymorphisms reveals an increasing proportion of migrants from the eastern Atlantic Ocean.

2021 ◽  
Author(s):  
Gregory Neils Puncher ◽  
Alex Hanke ◽  
Dheeraj Busawon ◽  
Emma Sylvester ◽  
Walter Golet ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Gulf Of Maine ◽  
Age Groups ◽  
Subsequent Development ◽  
Bluefin Tuna ◽  
Nucleotide Polymorphisms ◽  
Western Atlantic ◽  
Individual Assignment ◽  
Atlantic Bluefin Tuna ◽  
Stock Assessments

Identifying the origin of fish contained in a mixed fishery is critical for accurate stock assessments and the subsequent development of appropriate management strategies. Using a panel of 92 SNPs developed to differentiate Atlantic bluefin tuna (Thunnus thynnus) from the two main spawning areas (Gulf of Mexico and Mediterranean Sea), we used individual assignment to determine composition of feeding aggregations in the northwestern Atlantic Ocean (Gulf of Maine, Bay of Fundy, Scotian Shelf, Gulf of St. Lawrence, coastal Newfoundland). Among the 3,163 individuals collected between 2004 and 2018, we found that among lower age groups (<15 years) the spawning stock providing the most recruits to the Canadian fishery transitioned from Western Atlantic to Mediterranean origin over time. While the majority of older adults (>15 years) have consistently been of Western Atlantic origin, the disparity in the proportional contribution of western and eastern spawning groups narrowed significantly over the 14-year study period. Our results can be used to inform population-specific exploitation rates, improve stock assessments, identify age-dependent habitat use and areas suitable for additional conservation efforts.

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