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USFC ''Fish Hawk'' was a fisheries research ship operated by the United States Commission of Fish and Fisheries and its successor, the United States Bureau of Fisheries, from 1880 to 1926. She was the first large ship purpose-built by any country for the promotion of fisheries,〔(NOAA History: R/V Fish Hawk 1880-1926 )〕 and spent her 46-year career operating along the United States East Coast, in the Gulf of Mexico, and off Puerto Rico.〔 ==Design and construction== From its foundation in 1871, the U.S. Commission of Fish and Fisheries, more generally known as the U.S. Fish Commission, recognized a need for ships to operate along the coast of the United States to engage in exploration, conduct surveys, and perform scientific research on marine resources. In addition, fishery scientists of the time believed that successful spawning was the most significant factor in the productivity of fisheries; the spawning of American shad at the time was the most important fishery in the United States, and because shad runs lasted only a month in any given location, a floating fish hatchery that could move along the coast was deemed more cost-effective than constructing shad hatcheries along the entire U.S. East Coast.〔 The United States Department of the Navy loaned the Fish Commission a small steam launch to conduct its field work during the summer of 1871. The Commission had no ship in 1872, but during each summer from 1873 through 1875 the Navy Department loaned it the 100-ton steamer ''Blue Light''. The Commission again had no ship in 1876, but the Navy Department loaned it the 306-ton steamer ''Spedwell'' during the summers of 1877, 1878, and 1879. These vessels were only minimally modified for fisheries research work, with only primitive equipment installed. The Fish Commission clearly required a vessel designed specifically for service as a floating hatchery and fisheries research ship, and so in 1879 the United States Congress appropriated $45,000 (USD) for the construction of a fisheries research steamer to be named ''Fish Hawk''.〔 The Fish Commission chose a design by C. W. Copeland of the United States Lighthouse Board,〔 and the Pusey and Jones Company built the ship at Wilmington, Delaware.〔(Anonymous "Out With the Fish-Hawk," ''The New York Times'', September 20, 1880 )〕 ''Fish Hawk'' had a fore-and-aft two-masted schooner rig, coal-fired steam propulsion, and twin screws, and was intended for coastal work rather than oceanic research. She had an iron hull sheathed with about 3 inches (76.2 mm) of yellow pine, caulked and coppered. Above the main deck she was of wooden construction. The pilot house, captain's quarters, and a laboratory were on a promenade deck extending along the entire length and across the entire width of the ship.〔 ''Fish Hawk''s main deck was filled with hatching equipment to allow her to serve as a floating hatchery for American shad, striped bass, mackerel, and herring. A pump supplying 10,000 gallons (37,854 liters) of water per hour and two 500-gallon (1,893-liter) distribution tanks fed the equipment. Fertilized fish eggs were placed in 36 hatching cones, each capable of hatching 200,000 American shad eggs, and feed valves regulated the current through the cones to keep the eggs gently in motion so they would not mat or settle to the bottom. ''Fish Hawk'' also had 18 hatching cylinders – each capable of holding 250,000 eggs – with wire gauze bottoms; the cylinders were suspended from beams hanging over the sides of the ship and partially submerged, with nine on each side. Cam machinery caused the cylinders to rise gently and drop more rapidly for about eight inches (20 cm), which made the eggs circulate freely without settling on the bottom.〔 ''Fish Hawk'' also was outfitted to conduct general scientific research related to fisheries, including depth sounding, measuring the temperature of the sea bottom, and collecting marine animals and plants. She had a hoisting winch with 1,000 fathoms (6,000 feet; 1,829 meters) of steel cable for trawling and dredging, an otter trawl, a 9-foot (2.75-meter) beam trawl, an 11-foot (3.6-meter) beam trawl, a 17-foot (5.2-meter) beam trawl, Blake and Chester rake dredges, and a tangle bar, the latter an iron axle and wheels with deck swabs or bundles of rope yarn on chains that ''Fish Hawk'' could drag along the sea bottom to capture marine animals and plants. For hydrography, she had a sounding machine with 600 fathoms (3,600 feet; 1,097 meters) of piano wire, deep-sea reversing thermometers, and density salinometers.〔 ''Fish Hawk'' had a crew of 84 and berthing for another 25 people on temporary assignment to the ship, such as scientists, technicians, or passengers aboard as observers.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「USFC Fish Hawk」の詳細全文を読む スポンサード リンク
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