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A sea monster attacks a ship in an illustration for 20,000 Leagues Under the Sea by Jules Verne.
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Sea Monster Attack

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A shell placed in seawater with increased acidity slowly dissolves over 45 days.
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Shell Dissolves in Seawater

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In this photo, the jellyfish Pandea rubra may have been surprised by a camera light or in a defensive state, causing it to contract its red mantle and reveal its complex muscle anatomy.
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Red Paper Lantern Jellyfish

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Bathochordaeus stygius are filter feeders closely related to sea squirts in the phylum Chordata, the same phylum to which humans belong.
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Mucus Home

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Cystisoma (a type of hyperiid crustacean) has one huge pair of eyes.
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Giant Eyes

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An image of collections storage at the Smithsonian National Museum of Natural History.
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Smithsonian Fish Collections

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An autonomous underwater vehicle from the Monterey Bay Aquarium Research Institute (MBARI) being launched from the NOAA Ship Gordon Gunter in the Gulf of Mexico.
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Autonomous Underwater Vehicle in Gulf of Mexico

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A 3-D reconstruction of the skull of a fin whale fetus.
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3-D Reconstruction Of Fin Whale Skull

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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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An underwater photo of Southern Bluefin Tuna swimming above a fish farm net.
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Southern Bluefin Tuna (Thunnus maccoyii)

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Large numbers of grey reef sharks were observed at Jarvis Island, an uninhabited Pacific island, during the 2010 Pacific RAMP expedition of the NOAA Ship Hi'ialakai.
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Reef Sharks Passing Through

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Venomous Box Jelly from South Carolina
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Venomous Box Jellyfish from South Carolina

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