Dictionary of Ichthyology  

zooplankton = plankton (q.v.) comprised of animals, cf. phytoplankton.

Wikimedia Commons: http://commons.wikimedia.org/wiki/File:Mysis2kils.jpg (Mysis at left) and http://commons.wikimedia.org/wiki/File:Zooplankton2_300.jpg (Beroidae at right)

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