| nanoplankton | (noun) microscopic organisms found in plankton | - |
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| nekton | (noun) the aggregate of actively swimming animals in a body of water ranging from microscopic organisms to whales | - |
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| phytoplankton | (noun) photosynthetic or plant constituent of plankton; mainly unicellular algae | - |
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| plankton | (noun) the aggregate of small plant and animal organisms that float or drift in great numbers in fresh or salt water | - |
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| potamoplankton | (noun) plankton that inhabit rivers | - |
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| zooplankton | (noun) animal constituent of plankton; mainly small crustaceans and fish larvae | - |
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