Is the southern Bay of Biscay a spawning ground for thunnus thynnus and sarda sarda?
The spawning grounds of the Atlantic Thunnus thynnus are traditionally considered to be the Gulf of Mexico (GOM) and the Mediterranean Sea (MED). However, for the western Atlantic, unequivocal evidence of T. thynnus spawning outside the GOM has been presented. In this study, we show evidence for T....
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2019 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/311810 |
| Acceso en línea: | http://hdl.handle.net/10261/311810 |
| Access Level: | acceso abierto |
| Palabra clave: | Centro Oceanográfico de Gijón Fish larvae Atlantic bluefin tuna Thunnus thynnus Atlantic bonito Sarda sarda spawning Eastern Atlantic southern Bay of Biscay |
| Sumario: | The spawning grounds of the Atlantic Thunnus thynnus are traditionally considered to be the Gulf of Mexico (GOM) and the Mediterranean Sea (MED). However, for the western Atlantic, unequivocal evidence of T. thynnus spawning outside the GOM has been presented. In this study, we show evidence for T. thynnus reproduction outside the MED in the eastern Atlantic. Using opportunistic ichthyoplankton samplings, 9 T. thynnus larvae were collected during July 2010 and 2015, in the Southern Bay of Biscay (SBB). The microscopic identification of Atlantic bluefin larvae, based on morphologic and meristic characters and pigmentation patterns was confirmed by genetic analysis. As for Sarda sarda, the spawning grounds for this species in the eastern Atlantic are located in the neritic regions of the tropical and subtropical Atlantic and of the MED. However, 6 larvae of this species were collected in the SBB since 2001. Therefore, the SBB should be evaluated as a spawning ground for T. thynnus, since its larvae appeared in 33% of the stations sampled during July 2010 in the slope-oceanic region, where this species reproduces. |
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