By the early 20th Century, a number of hatcheries were established in the park by the U.S. Bureau of Fisheries including hatcheries at Yellowstone Lake and Soda Butte Creek. The current Lake Fish Hatchery replaced an earlier hatchery at Lake. These hatcheries not only produced stocks for the park, but also took advantage of the great spawning stock of Yellowstone cutthroat trout to supply eggs to hatcheries around the U.S. Between 1901 and 1953, 818 million trout eggs were exported from the park to hatcheries throughout the U.S.
The hatcheries and stocking operations had both positive and negative impacts on the quality of angling in Yellowstone National Park in the first half of the 20th Century. Many native populations were displaced by non-natives, but there was quality brown and rainbow trout fishing in the Firehole, Madison and Gibbon rivers. Ultimately stocking and hatchery operations negatively impacted Yellowstone cutthroat, westslope cutthroat trout and arctic grayling populations in the park. In 1953 the National Park Service began closing the hatcheries and stopping stocking operations. The last fish stocked for the benefit of anglers was in 1955 after some 310 million fish had been released in park waters since 1889. The last hatchery was closed in 1957.
The chief building of the district is Building 725, the South District Office for the park and the former Fish and Wildlife Service messhall. The 1,588-square-foot (147.5 m2) building was built in 1935 using a "logs out" technique of construction, in which the log frame is exposed on the outside and the sheathing is set in, giving the interior a smooth wall finish. Building 726 was the hatchery, built in a similar style about 1930 and transferred to the Park Service in 1959. The one story building encloses about 3,464 square feet (321.8 m2). An arched log truss is a prominent feature of the end elevation, together with a rubblestone chimney. Building 729 was an office and summer residence for the Fish and Wildlife Service's hatchery director. Built in 1932, the 2,173-square-foot (201.9 m2) one story building matches its neighbors, in an L-shaped plan. Buildings 730 and 731 are smaller residences, built about 1931. Building 732, a garage, was built in 1930 with six bays. Building 733 was a FWS bunkhouse, built in 1930 with about 2,295 square feet (213.2 m2). Building 735, a wash house, and 737, an oil house, complete the ensemble.