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The present investigation demonstrates the formation of silver nanoparticles by the reduction of the aqueous silver metal ions during exposure to the seaweed (Chaetomorpha linum) extract. The silver nanoparticles obtained were characterized by UV-visible spectrum, FTIR and scanning electron microscopy. The characteristic absorption peak at 422 nm in UV-vis spectrum confirmed the formation of silver nanoparticles. The colour intensity at 422 nm increased with duration of incubation. The size of nanoparticles synthesized varied from 3 to 44 nm with average of *30 nm.

The seaweeds could be considered for curing diseases from oxidative deteriorations.

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