zooplankton zooplanktonmicroscopic animals, such as crustaceans and fish larvae, that drift in the water column. Related Articles: Glossary: planktonBiological OceanographerWebinar Archive: Introduction to Underwater AcousticsDr. Benoit-BirdHow is sound used to measure plankton?How is active acoustics used in fisheries research and management?Autonomous Surface VehiclesNew Zealand BigeyeNorth Atlantic Right WhaleSound Scattering Layers Chris Knowlton2018-06-13T13:42:31-05:00