There are three basic types of commercial fishing vessels found in the Mid-Atlantic region: trawlers, seiners/gill-netters, and long-liners. A trawler or "dragger" operates by towing its fishing gear across the bottom. Weighted nets take bottom fishes, while cage-like steel dredges take clams and scallops. A seiner uses a floating net to encircle schools of surface-swimming fishes such as herring and tuna. A long-liner sets out miles of buoyed line with baited hooks to catch sharks, tuna, and swordfish. One could also add lobster boats and charter fishing or "head" boats to this list. And of course, dive boats.
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John S Dempster Jr. is sister to Shearwater and Reedville, see those vessels for details, links in the sidebar. All three vessels were originally small Army transports, converted to Menhaden fishing by Omega Protein company. FS-355 was USCG-manned, and retained by USA as PVT Carl V. Sheridan (see below) until sold in 1972.
The aging Shearwater and Reedville were retired when Omega got two new modern vessels in 2017, but Dempster was kept as a reserve. Finally, almost 80 years old, the Dempster was sent to her reward as well. Another sister, Tangier Island, was reefed off Georgia in 2020. As of 2023, one old sister remains - Smuggler's Point, FS-400, launched in 1944!
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Side-scan sonar is a modern method of underwater imaging that can produce remarkably detailed and realistic views of shipwrecks and other bottom features using sound rather than light.
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