Aruda also studies a "large" copepod, Calanus, to discover what kinds of bacteria live on it. These microscope photos show a top and side view of Calanus, a 4 milimeter (0.16 inch)-long shrimp-like crustacean. The marine zooplankton is critical food for larger marine animals, from fish to whales. (Top photo by Chris Linder, Chris Linder Photography. Bottom photo by Mark Baumgartner, Woods Hole Oceanographic Institution.)[back]
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