Abstract

1. Arrivals of Sargassum The marine phenomenon that caused these arrivals in the French Antilles in 2014 and 2015 is new. It seems the same as that observed for a long time in the southern United States, but geographically separate. An analogy between the two phenomena comes to probability of these arrivals and, based on last year coastal survey by the State services, a scenar-io of strandings for several years is defined by intensity and frequency.2. Evolution of Sargassum after stranding The consolidation of Sargassum, their fermentation and odor, their drying are poorly documented, different from green algae's; changes overtime are summarized in volumes and weights. 3. Possible collection and valorisation systems Technical and especially economic viability of many possible pathways is not demonstrated yet. Only a small number of collection, drainage and recovery systems are actually proven 4. Provisional management scheme optimized in quantity and cost It results from the combination of coastal configuration types, amounts of arrivals and unit costs of collection and re-covery of stranded algae in the context of the French Antilles. 5. Some questions to scientists and operational More precise estimates are possible if quantification protocols are followed in the future.

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