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Dinoflagellates are major producers of oxygen in the ocean (and freshwater). But some species can grow out of control, causing a red tide.
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Dinoflagellate

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A side-view of translucent hyperiid with a black background.
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Cystisoma

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A bull shark's ability to prey on many different species is helped by its capacity to survive in both freshwater and saltwater.
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Swinging for Bull Sharks

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This colony of <em>Rosacea</em> may look like a single jellyfish, but it is actually a large group of smaller siphonophores clustered and living together.
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Jellyfish, or Siphonophore Colony?

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This copepod (Gaussia princeps) was collected deeper than 1000 meters in the Sargasso Sea by Census of Marine Zooplankton (CMarZ) researchers in April 2006.
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Deep Sea Copepod

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A transparent ctenophore in dark water.
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A Ctenophore Feeds

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10 grains of star shaped sand collected from southern Japan
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Star Sand Grains Collected from Southern Japan

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Two nurse sharks hover over a baited cage
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Just Jelly: ecological role of gelatinous zooplankton

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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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A large red research vessel among icy waters and snowy mountains
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Shipboard Life in the Antarctic

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Image of two dinoflagellates seen through a microscope.
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Dinoflagellates: One Species at a Time

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The shell of a sea slug
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A Microscopic Identity Crisis

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