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a frond of red algae
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Fronds of Nori

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a leafy bunch of red algae on a rock
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Irish Moss

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Hardy head silversides (Atherinomorus lacunosus) are abundant fish in shallow water reef flat seagrass meadows throughout the Indo-Pacific.
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Seagrass and Shoal of Fish

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an algae bloom around Florida is documented by a satellite
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Seeing Algae from Space

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A close-up image of Johnson's seagrass growing in sand.
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Johnson's Seagrass

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A close-up photo of the seeds on the plant Phragmites australis.
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Phragmites australis, seeds

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Broad-leaf seagrass (Posidonia australis) with algae epiphytes grows at Corner Inlet Marine National Park in Australia.
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Seagrass with Epiphytes

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Seagrasses don't just provide shelter for free-swimming animals, but also are a habitat for non-moving organisms, such as these sea anemones.
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Anemone on Seagrass Blade

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Algae has overtaken this coral reef off heavily populated Kiritimati, or Christmas Island.
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Unhealthy Coral Reef, Kiritimi, Line Islands

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Seagrasses are flowering plants that can form dense underwater meadows and are an important shallow water habitat.
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Bringing Back Tampa Bay’s Seagrass

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A bloom of algae from up above
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What Exactly Is a Red Tide?

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The Amazon River carries all the rainwater that lands in the Amazon rainforest, covering some 2.1 million square miles, into the ocean. And with it, it carries vital nutrients like phosphorus, nitrogen and silicon.
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Thirty Days to Submission: How I Made a Video for Ocean180

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