zooplankton zooplanktonmicroscopic animals, such as crustaceans and fish larvae, that drift in the water column. Related Articles: Glossary: planktonWebinar Archive: Introduction to Underwater AcousticsAutonomous Surface VehiclesNorth Atlantic Right WhaleOcean ObservatoriesSouthern Right WhalePlankton Biologist Chris Knowlton2018-06-13T13:42:31-05:00