Great Lakes Fishery Research Authorization Act of 2019 This bill authorizes the U.S. Geological Survey (USGS) to conduct monitoring, scientific assessments, and research in support of fisheries within the Great Lakes Basin between the United States and Canada. The USGS shall (1) execute a comprehensive, multi-lake, freshwater fisheries science program; (2) work cooperatively with regional, state, tribal, and local governments; and (3) consult with interested groups, including academia and Canadian agencies. The USGS may provide deepwater ecosystem research, fish behavior and habitat reports, fish population assessments, invasive species research, use of biological equipment and laboratory capabilities necessary to support fishery management decisions, and studies that assess impacts on Great Lakes fishery resources.