The problem
Sargassum is a living pelagic ecosystem that juvenile fish, sea turtles, crabs and endemic species depend on. That is exactly why this campaign refuses a blanket removal position. The emergency begins when extraordinary accumulations converge on shallow water, canals and beaches and start to decompose.
Stage by stage
Living pelagic habitat. Juvenile fish, turtles, crabs and endemic species depend on it. Nothing should be collected here.
Correct response: Protect and monitor. No intervention.
Distance to shore
> 50 nm
Mat density
Dispersed
Dissolved O₂
Normal
Intervention
None
Collection here would remove living habitat. This stage is a protect-only zone.
Scale
The belt runs from West Africa across the tropical Atlantic into the Caribbean and Gulf. Abundance in the 2026 season reached extraordinary levels, and USF's satellite record documented severe southeast Florida beaching.
Illustrative seasonal curve — see USF bulletins for the authoritative series
[S01] University of South Florida Optical Oceanography Laboratory
What decomposition does
USF's satellite record documented severe southeast Florida beaching during the 2026 season, with the Great Atlantic Sargassum Belt at extraordinary abundance.
[S01] University of South Florida Optical Oceanography Laboratory
Pelagic Sargassum harvest is prohibited in South Atlantic federal waters south of the North Carolina-South Carolina boundary; north of it, harvest is tightly limited by area, season, observer, gear and annual-weight restrictions.
[S02] NOAA Fisheries[S05] NOAA Fisheries[S06] NOAA Fisheries
After canal removal at Big Pine Key Canal 266, organic content fell from 31.9% to 1.0% and average sediment depth from 154 cm to 40 cm; conditions later moved back toward baseline.
Decomposing Sargassum emits measurable sulfur compounds, and stranding studies document arsenic mobilization and enterococci in beach wrack.
[S12] University of Miami[S13] University of Miami / FIU[S14] Environmental Monitoring and Assessment[S15] Exposure and Health
Brown-tide events have caused severe documented seagrass and marine-animal impacts in the Mexican Caribbean and in Jobos Bay, Puerto Rico.
A Mote Marine Laboratory experiment using healthy living Sargassum collected one to five miles offshore found mixed coral responses and no final growth difference. It did not reproduce a decomposing, oxygen-depleted brown tide.
NOAA NCCOS modeling quantifies multimillion-dollar economic impacts to Puerto Rico, the U.S. Virgin Islands and coastal Florida.
The Florida Department of Health evaluated North Miami Beach complaints about rotting-seaweed odor and rashes, advising respiratory-sensitive people to avoid strong odors while judging long-term open-air risk minimal.
Intellectual honesty
A Mote Marine Laboratory experiment using healthy living Sargassum collected one to five miles offshore found mixed coral responses and no final growth difference. It did not reproduce a decomposing, oxygen-depleted brown tide — which is precisely the distinction this campaign is built on.
[S18] Mote Marine Laboratory / Frontiers in Marine Science
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