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Figure 20. Horizontal shutter plankton net first invented by Prince Albert I ofMonaco in 1889. Left: view of the assembled unit. Right: the messenger totrigger operation of the unit. This net would be lowered to a specified depthand then a messenger sent down the line to open it and capture drifting fauna at depth. This was first tested by Prince Albert I off Madeira in 1889. (Image credit: Oceanographic Museum of Monaco)