updates

A new research internship reinforces the BLUEMED project - 01/02/2017 >>>

We warmly welcome Géraldine Perez who joined the BLUEMED project for a 6 months Master fellowship.

Géraldine will develop an operational model that simulates the vertical behaviour of ABFT and the aerial survey path to account for this two factors in the derivation of the abundance index.

A dedicated portal for tag recoveries now active on social media - 01/09/2016 >>>

A dedicated facebook page that provides real-time information on the pop-up positions of the MARBEC group tags has been created. You can find information on the BLUEMED pop-up tags there!

Summer tagging season ended - 31/08/16 >>>

A total of 16 electronic tags were deployed.

This year the second BLUEMED tagging campaign took place, with the purpose of tagging ABFT juveniles (30-40 Kg) with miniPATs. Two different teams were involved in the tagging. The CYNGALI team, based in Carry-le-Rouet, and the ROUSSILLON FISHING team in Saint Cyprien. Special thanks to both teams for participating to the Bluemed project.

One minipat Recovered in in the bay of Cala Millor in Mallorca (Spain)- 11/07/16 >>>

Special thanks to Olaf Sauerbier who recovered the miniPAT tag and contacted the researchers of our team.

Spring tagging operations ended - 01/06/16>>>

Four electronic tags were deployed on juvenile Bluefin tuna

The BLUEMED team is growing - 01/04/16>>>

Welcome to Robert Bauer who joined the BLUEMED project in April 2016.

Robert will work in the MARBEC Lab for a Postdoc of 18 months focusing on the BLUEMED electronic tagging data.

Postdoc Opportunity - 24/11/15 >>>

Postdoc: Modeling the vertical behavior of Bluefin tuna for deriving fisheries-independent abundance indexes.

Postdoc: Modeling the vertical behavior of Bluefin tuna for deriving fisheries-independent abundance indexes

Keywords
Bluefin tuna, Abundance estimates, Field-based modeling, Behavioral ecology, Fisheries science.

Institution
UMR MARBEC (Marine Biodiversity Exploitation and Conservation) Sète, France.

Context
The Postdoc will integrate the MARBEC research unit (www.umr-marbec.fr) and work in the framework of the ANR project BLUEMED (www.bluemed-project.com), funded by the French National Research Agency (ANR www.anr.fr). The project aims at deriving abundance estimate of Atlantic Bluefin Tuna (Thunnus thynnus) through an integrated modeling and data analysis approach based on fisheries-independent data. This is a collaborative project that joins researchers working on field data collection (mainly electronic tagging and aerial surveys), data analysis and modeling both in France (IRD, IFREMER), and the EU (Université Libre de Bruxelles, Belgium). Further collaborative actions related to the project involve research teams from AZTI-Technalia (Spain) and the Large Pelagic Research Center (US), thus providing the opportunity to dispose of a large electronic tagging dataset of Atlantic Bluefin Tuna from both the Mediterranean sea and the Atlantic Ocean.

Main tasks
The postdoc will work on two main tasks:
• Task 1: Tagging data analysis
• Task 2: Integrated Modeling/Abundance Index

Task 1 will focus on miniPAT data (Time at Depth + geolocation) collected from tagged individuals of Bluefin tuna both in the Mediterranean sea and in the North Atlantic ocean. The main objective of this task is quantifying the continuous bouts of time spent at the surface (between 0 and 10 m, denoted below as CST, Continuous Surface Times) and in the rest of the water column for each tagged individual. The characterization of CST will be conducted using methods of survival analysis, which recently found applications in the behavioral ecology of tropical tuna around Fish Aggregation Devices (see e.g. Capello et al., Plos ONE 2015). Survival curves of CST will be compared according to the size of the tagged individuals, environmental parameters (SST values and front densities) and geographical areas. This comparison aims at identifying the main drivers of the variability in the vertical behavior of Bluefin tuna as well as the common timescales and traits.

Task 2 will consist in incorporating the information obtained from this data into a stochastic behavioral model that simulates the vertical behavior of schools of Bluefin tuna. Such model will incorporate an aerial survey trajectory. The main objective of this task is to conduct a sensitivity analysis on the number of schools observed from a plane (basic information used to derive a fisheries independent abundance index) as a function of the survey path, the spatial distribution of the schools (poissonian, aggregated), the number of replica and the variability in the vertical behavior of tuna that was observed. Such analysis will allow assessing the optimal sampling strategy depending of the different scenarios mentioned above. Finally, where both electronic tagging and aerial surveys data are available (in the North western Mediterranean sea), the accuracy of the estimated abundance index and the optimal sampling strategy will be assessed for the specific spatial distribution of surface schools and vertical behavior of tuna observed in that region.

Main skills
Applicants should have strong quantitative skills and a PhD degree in fisheries science, quantitative ecology or related discipline.
Candidates should have a strong experience in statistical analysis and/or modeling and an interest in applying models to field data.
Knowledge of at least one programming language (R, Fortran, C/C++, Python) is required, as well as written and oral communication skills in English.

Supplementary info

Starting date: 1st of April 2016

Duration and salary: 18 months, with possibility to renew the contract depending on the availability of funds. Salary follows the IRD salary ranges and depends on the candidate’s experience.

Deadline: 31st of January 2016. Applications should include a CV and a publication list.

Contacts
Manuela Capello, PhD (IRD)
Tel: +33 (0)4 99 57 3257 - Fax: +33 (0)4 99 57 32 95
contact

One minipat Recovered in Port Leucate (France)- 02/11/15 >>>

Special thanks to Anouk Carrere (France) who kindly sent us the miniPAT tag.

The Bluemed team would like to thank Anouk Carrere (France) who kindly sent the miniPAT tag to the MARBEC Lab.

One minipat Recovered in Sardegna (Italy)- 22/09/15 >>>

Special thanks to Mauro Sgrosso (Italy) who kindly sent us the miniPAT tag.

The Bluemed team would like to thank Mauro Sgrosso (Italy) who kindly sent the miniPAT tag to the MARBEC Lab.

2015 tagging season concluded - 20/09/15 >>>

A total of 9 miniPATs were deployed during the 2015 tagging season.

This year the first BLUEMED tagging campaign took place, with the purpose of tagging ABFT juveniles (30-40 Kg) with miniPATs. Two different teams were involved in the tagging. The CYNGALI team, based in Carry-le-Rouet, and the ROUSSILLON FISHING team in Saint Cyprien. Special thanks to both teams for participating to the Bluemed project and to Jean-Marc Fromentin who kindly provided 3 supplementary miniPATs.

BLUEMED Kick-off meeting- 22/01/15 >>>

A first meeting of the BLUEMED team took place in Sète.

The meeting joined participants from IRD (M. Capello, L. Dagorn), IFREMER (J-M. Fromentin, S. Bonhommeau) and ULB (J-L. Deneubourg).