 US FWS Henry O'Malley, from Commercial Fisheries Review, March 1950
| |
 United States Navy | |
|---|---|
| Name | USS YP-646 |
| Builder | Colberg Boat Works, Stockton, California |
| Completed | 1945 |
| Commissioned | 11 June 1945 |
| Decommissioned | mid-1946 |
| Fate | Transferred to Fish and Wildlife Service 26 January 1948 |
 U.S. Fish and Wildlife Service | |
| Name | US FWS Henry O'Malley |
| Namesake | Henry O'Malley (1876–1936), U.S. Commissioner of Fisheries (1922–1933) |
| Acquired | 26 January 1948 |
| Commissioned | 1949 |
| Homeport | Pearl Harbor, Territory of Hawaii |
| Fate | Sold 16 February 1951 |
 United States | |
| Name | MV Santa Rosa |
| Owner |
|
| Homeport | San Diego, California (1977) |
| Identification | IMO number: 7308475 |
| Fate | Unregistered as of 1984 |
| Notes | Derelict as of 1987 |
| General characteristics (as U.S. Navy vessel) | |
| Type | Patrol vessel |
| Displacement | 403 tons |
| Length | 117 ft (36 m) |
| General characteristics (as fisheries research vessel) | |
| Type | Fisheries research ship |
| Tonnage | 550 GRT |
| Length | 128 ft (39 m) |
| Beam | 29 ft (8.8 m) |
| Draft | 15 ft (4.6 m) |
| Installed power | 2 x 125-kW diesel–electric generators |
| Propulsion | 560 hp (420 kW) diesel engine |
| General characteristics (as private fishing vessel) | |
| Type | Fishing vessel |
| Tonnage | |
US FWS Henry O'Malley was an American fisheries science research vessel in commission from 1949 to 1951 in the fleet of the United States Department of the Interior's Fish and Wildlife Service. She was the first U.S. fisheries science vessel to explore the central Pacific Ocean in search of commercially valuable populations of fish. Her career was cut short by a requirement for cost-prohibitive repairs.
Prior to her time in the Fish and Wildlife Service, the vessel was in commission in the United States Navy as the patrol vessel USS YP-646 from 1945 to 1946. After her Fish and Wildlife Service career ended, she became the private fishing vessel MV Santa Rosa.