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Petroleum ether extracts of 33 species of macroscopic seaweeds (Chlorophyta, Rhodophyta and Phaeophyta) were assayed for their antibacterial activity against Sarcina lutea ATCC 1001, Staphylococcus aureus ATCC 6538 P and Bacillus subtilis ATCC 6633. Some degree of antibacterial activity was found to be present in ] 7 of these 33 extracts.

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In the last fourteen years the production of seaweeds in Chile has ranged from 74000 to 229 000 wet metric tons per year and has included about twenty species belonging to Phaeophyta and Rhodophyta. The only source of this production has been the exploitation of natural beds, except for Gracilaria, which is the only case of commercial cultivation and contributes significant quantities to total production . Initially most of the raw material was exported but currently important quantities of Gracilaria and several carrageenophytes are being processed by local industry . Changes in production of the main resources are analyzed with consideration of potential demand, level of knowledge about natural beds, and the situation of total Gracilaria farming, in order to attempt predictions for the supply. Current possibilities of applying new technologies to cultivate other economically important Chilean seaweeds are also analyzed and discussed . 371