National Fish Habitat Conservation Act of 2019 This bill establishes the National Fish Habitat Board to (1) encourage partnerships among public agencies and other interested parties to promote fish conservation, (2) establish national goals and priorities for fish habitat conservation, (3) recommend to Congress entities for designation as a Fish Habitat Partnership, and (4) review and make recommendations regarding fish habitat conservation projects. The U.S. Fish and Wildlife Service, the National Oceanic and Atmospheric Administration, the Environmental Protection Agency, and the U.S. Geological Survey may provide technical and scientific assistance to the partnerships, participants in the fish habitat conservation projects, and the board.