. Commercial fisheries review. Fisheries; Fish trade. ARTICLES A submersible pump produced results comparable to those of a vessel-mounted system. DEVELOPMENT OF A SUBMERSIBLE PUMPING SYSTEM FOR A HYDRAULIC SURF CLAM DREDGE By Mark L. Standley* and Phillip S. Parker** An electrically driven submersible pump was tested as a means of supplying water to a surf clam dredge. A 65-horsepower submersible pump was mounted on a 48-inch clam jetting dredge. The pump supplied 2,000 gallons per minute directly to the jet manifold of the dredge. Comparison tows were made with the submersible system and the
. Commercial fisheries review. Fisheries; Fish trade. ARTICLES A submersible pump produced results comparable to those of a vessel-mounted system. DEVELOPMENT OF A SUBMERSIBLE PUMPING SYSTEM FOR A HYDRAULIC SURF CLAM DREDGE By Mark L. Standley* and Phillip S. Parker** An electrically driven submersible pump was tested as a means of supplying water to a surf clam dredge. A 65-horsepower submersible pump was mounted on a 48-inch clam jetting dredge. The pump supplied 2,000 gallons per minute directly to the jet manifold of the dredge. Comparison tows were made with the submersible system and the standard vessel-mounted pumping system to determine their relative efficiencies. The submersible pump operated satisfactorily and gave results comparable to the vessel-mounted system. Advantages of the new systemare ease of handling and greater efficiency inpower trans- mission. The history of the development of surf clam harvesting gear, like that of most other fish- ing gear, reflects a long, slow, evolutionary process. Advances have been dictated by the need to increase efficiency to keep the fishery economically feasible. Surf clam gear is ad- vancing today at a more rapid rate than the early change from hand longing to dredging. The use of a dredge towed by a vessel began in the 1920s, and the development of a hydrau- lic jet dredge took place during the mid-1940s. Since then, little change has taken place in the basic principles of hydraulic dredging, but the size and efficiencies of the gear have grown to the point where larger dredges do not appear feasible (fig. 1). As dredges increase in size and greater flow rates to the jet manifold are required, the problems of handling the large hoses and the lost efficiencies in transferring water through them lead to the conclusion that a sub- mersible pump mounted directly on the dredge would be a desirable development in the evo- lution of the surf clam dredge. A submersible pump, driven by an electric motor, would eliminate
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