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![Figure 15 ship4080.jpg Figure 15](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4080.jpg?itok=6BWw1maB)
Description
Figure 15. Zacharias ethmophore plankton filter devised by Otto Zacharias in1907. Top: view of the assembled apparatus. Bottom: internal speed reductionvalve. This instrument was devised to collect plankton under adverse meteorological conditions where normal net-towing operations became impossible. This instrument was first used in a lake, but then in the Mediterranean and Tyrhennian. (Image credit: Oceanographic Museum of Monaco | D. Mille)