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Figure 14. Apstein plankton tube. Above: Top view. Below: bottom view.Invented by Carl Apstein who had been studying lake fauna. Apstein collaboratedwith Hensen to work in the Baltic and North Seas. Apstein perceived quicklythat methods of work would have to vary considerably from lake work and made this instrument for collecting small plankton under difficult conditions. (Image credit: Oceanographic Museum of Monaco | D. Mille)