Invasive Seaweed:
From Nuisance to Necessity

Sargassum, a floating brown macroalgae, is commonly found in temperate and tropical oceans, often inhabiting shallow waters and coral reefs. This seaweed has a remarkable ability to absorb contaminants and heavy metals from the ocean, positioning it as a potential natural remediation solution for contaminated sites. However, once Sargassum absorbs these contaminants, its bioaccumulation can reach dangerous levels, rendering it unsuitable for human consumption or use as natural fertilizer.

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With rising ocean temperatures, Sargassum has rapidly become a nuisance. It has proliferated extensively in tropical waters, absorbing larger amounts of nutrients and CO2 from the aquatic environment. This, in turn, encourages the growth of dinoflagellates, which can lead to harmful algal blooms, such as "red tide," a deadly toxin for marine life and humans. Local communities are struggling to prevent it from washing up on beaches, and because it is laden with toxins and heavy metals, it requires special disposal to prevent contamination of groundwater as it decomposes. Additionally, the seaweed’s decay creates an unpleasant odor.

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Increasing ocean temperatures have also caused Sargassum to spread into colder regions, including the coastal waters of British Columbia (BC). Endemic algae species, which are critical to the ecological health of the ocean, are being displaced by Sargassum. While some marine species, such as herring, can still use this algae for egg-laying, protecting endemic algae is crucial for maintaining biodiversity and overall ecosystem health.

We have partnered with several marine conservation organizations that are actively monitoring the spread of Sargassum off BC. While eradication programs are being considered, the algae’s potential accumulation of contaminants—especially in heavily used industrial sites—raises concerns regarding safe disposal.

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We are seeing early success using bioremediation techniques to remove contaminants from Sargassum. Once decontaminated, this algae can be processed into a clean and nutrient-rich fertilizer, safe for both personal and large-scale agriculture.

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Expressions of interest for partnerships and student work projects to advance this concept are now being accepted. Please contact us for more details.