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Skipjack under sail. The skipjack is a traditional fishing boat used on the Chesapeake Bay for oyster dredging.It is a sailboat which succeeded the bugeye as the chief oystering boat on the bay, and it remains in service due to laws restricting the use of powerboats in the Maryland state oyster fishery.
Mallard II moving mud, with its bucket outstretched. Mallard II is a wooden-hulled clamshell dredger [2] used to maintain levees on the San Francisco Bay Salt Ponds. [3] [4] Mallard II was constructed in 1936, [5]: 45 and is "probably the oldest operating dredge in California"; [6]: 51 she is owned and operated by Cargill Salt.
The design and construction of deadrise workboats evolved from the sailing skipjacks.One of the first types of purpose-built small powered fishing boats to appear on the Chesapeake Bay were the Hooper Island draketails of the 1920s and 1930s.
The dredge is usually constructed from a heavy steel frame in the form of a scoop. The frame is covered with chain mesh which is open on the front, which is towed. The chain mesh functions as a net. Dredges may or may not have teeth along the bottom bar of the frame. In Europe, early dredges had teeth, called tynes, at the bottom. These teeth ...
The dredge is towed through an oyster bed by a boat, picking up the oysters in its path. While dredges collect oysters more quickly, they heavily damage the beds, and their use is highly restricted. Until 1965, Maryland limited dredging to sailboats , and even since then motor boats can be used only on certain days of the week.
A grab dredge. Dredging is the excavation of material from a water environment. Possible reasons for dredging include improving existing water features; reshaping land and water features to alter drainage, navigability, and commercial use; constructing dams, dikes, and other controls for streams and shorelines; and recovering valuable mineral deposits or marine life having commercial value.
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For oystering the boat would be taken out to the bed, and the dredge would be dropped as a pass was made at speed over the bed. At the end of the run the dredge would be lifted onto the deck and the live oysters separated from the dead shells and other debris. This process would be repeated until sufficient oysters were obtained.
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