[wolongong942]

Wouldn't seaweed be a net for all of those toxins & pollutants found at sea? Seafood health claims are always focused on omega 3s and such but rarely mention this aspect.

[Danieru]

No. because Seaweed does not eat smaller Seaweeds.

Predator fish like Tuna can become heavier in toxins only because they are the top of a food chain gathering and concentrating said toxins.

Seaweed is just a plant. It grows, then dies if not harvested. It is no higher risk than wheat.