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Atlantic bluefin tuna Thunnus thynnus (ABFT) is a fish of high market value whichhas recently become strongly overexploited, notably in the Mediterranean Sea. This area is anessential habitat for ABFT reproduction and growth. We present here an approach for deriving thedaily mapping of potential ABFT feeding and spawning habitats based on satellite-derived seasurface temperature (SST) and chl a concentration. The feeding habitat was mainly derived fromthe simultaneous occurrence of oceanic fronts of temperature and chl a content while the spawninghabitat was mostly inferred from the heating of surface waters. Generally, higher chl a contentswere found to be preferred for the feeding habitat and a minimum SST value was found forthe spawning habitat. Both habitats were defined by the presence of relevant oceanographic featuresand are therefore potential and functionally-linked habitats. This approach provides, for thefirst time, a synoptic view of the potential ABFT habitats in the Mediterranean Sea. The modelperforms well in areas where both satellite data and ABFT observations are available, as 80% ofpresence data are in the vicinity of potential habitats. The computed monthly, seasonal and annualmaps of potential feeding and spawning habitat of ABFT from 2003 to 2009 are in good agreementwith current knowledge on ABFT. Overall, the habitat size of ABFT is about 6% of the Medi -terranean Sea surface. The results displayed a strong seasonality in habitat size and locations aswell as high year-to-year variations (30 to 60%), particularly for the potential spawning habitat,which is key information for evaluating the utility of ABFT Marine Protected Areas in the Medi -terranean Sea.JRC.G.4-Maritime affair

Potential feeding and spawning habitats of Atlantic bluefin tuna in the Mediterranean Sea