Noeud

Atlantic Bluefin tuna research and expertise in Ifremer, conservation and exploitation

Atlantic Bluefin tuna (Thunnus thynnus) is an emblematic large migratory species, commercially very valuable and with a complex history of exploitation.

A summary of this history can be found here (in French).

France is a major player in the international fisheries for this species and Ifremer has activities related to expertise (provision of an index of abundance, stock assessment) and research (spatial dynamics, link to the environment).

In our daily activity, both expertise and research fuel each other and this interaction serves to define scientific questions tackled through several projects.

Liste de noeuds

Aerial survey

Every year an aerial survey takes place from the first of August to the end of September. It consists in counting the number of schools over the Gulf of Lions. The evolution from one year to another is used to build an index of abundance that is used within ICCAT for the stock assessment.

Projects

Ifremer has developed or is involved in several projects, which aim at helping to understand the migratory dynamics and biology of Atlantic Bluefin tuna.

Electronic tagging

If we don't see many tunas during the aerial survey, does it mean there are not many tunas in the sea or does it mean they moved somewhere else ? Is the environment affecting such movements ? Tagging activities allow to understand individual behaviour and to answer such questions. Ifremer has been leading tagging activities in the Mediterranean for a very long time and has current activities in the Gulf of Lions, in the Atlantic and on the Maltese spawning ground. 

Collaborators

The list of scientists and people recurrently involved in our projects, with their main area of expertise.

Contact

Tristan ROUYER
34200 Sete France
tristan.rouyer@ifremer.fr