Yearly maximum concentrations of Aureococcus anophagefferens in: A. Narrangansett Bay (Rhode Island, RI), B. Peconic Estuary (New York, NY) C. the south shore estuaries (New York, NY), D. Barnegat Bay (New Jersey, NJ), and E. Chincoteague Bay (Maryland, MD), and Aureoumbra lagunensis in F. eastern Florida estuaries (FL) and G. Baffin Bay (Texas, TX) from 1985 – 2018. ND indicates no detection of brown tide alga. ‗Data not available’ means no data was collected / no data exists. In cases where there is no bar and no ND or ‘data not available’, the densities were detectable but low. Data sources for: Rhode Island (Anderson et al., 1993; Sieburth et al., 1988), all New York estuaries (Suffolk County Department of Health Services, 1985–2018; C.J. Gobler, unpublished), New Jersey (Anderson et al., 1993; Bricelj et al., 2017; Mahoney et al., 2003; M.D. Gastrich, unpublished), Maryland (Maryland Department Nuzzi et al., 1996;of Natural Resources, 2009–2018; Trice et al., 2004), Florida (St. Johns River Management District, 2012–2018), and Texas (Buskey et al., 1997, 1999, 2001; Villareal et al., 2004; Wetz et al., 2017; M. Wetz, unpublished).