Manatees in Miami — Miami, Florida

West Indian manatees (Trichechus manatus) are documented year-round residents of the waters surrounding Miami, with Biscayne Bay serving as the primary corridor connecting the city's eastern shoreline to the broader south Florida manatee range. The Florida Department of State designates the West Indian manatee as Florida's official State Marine Mammal — a status conferred in 1975 — describing the animal as a gray, aquatic herbivore reaching 8 to 14 feet in length and capable of exceeding one ton. Human activity accounts for roughly half of documented manatee deaths statewide, according to the same source.

Miami's geographic position on Biscayne Bay places the city at the center of a federally recognized manatee habitat zone. NOAA Fisheries designated Biscayne Bay a Habitat Focus Area in 2015, encompassing Biscayne National Park, the Florida DEP Biscayne Bay Aquatic Preserves, and the northern extension of the Florida Keys National Marine Sanctuary. Within this zone, manatees share the bay with dolphins, alligators, and American crocodiles, according to the Florida International University Southeast Environmental Research Center. Oversight of manatee protection within Miami-Dade County falls jointly to the Miami-Dade County Department of the Environment, which administers a Manatee Protection Program, and the Florida Fish and Wildlife Conservation Commission (FWC), the lead state agency.

Biscayne Bay's extensive seagrass meadows form the ecological foundation of manatee presence in Miami. A U.S. Army Corps of Engineers assessment identifies seagrasses in Biscayne Bay as an important food source for manatees and as nursery habitat for shrimp, crabs, lobster, and sponges. The FIU Southeast Environmental Research Center characterizes the bay's benthic communities as seagrass-dominated, supporting approximately 800 species in the broader water column, and notes the shorelines function as stopover habitat for migratory shorebirds alongside the larger marine megafauna.

The health of these seagrass beds is directly tied to manatee survival. The Biscayne Bay Foundation documents the connection between seagrass loss and elevated manatee mortality, drawing on statewide evidence including the die-offs documented in Florida's Indian River Lagoon. Algal blooms, driven in part by nutrient pollution, have been identified by the NOAA Habitat Blueprint as a subject of ongoing water quality research in Biscayne Bay, conducted in partnership with Biscayne National Park and Miami-Dade County.

Miami has a tropical monsoon climate with warm, humid summers and mild, drier winters. The cooler winter months — roughly November through March — correspond to peak manatee congregation in shallow, warmer inshore areas, as the animals seek thermal refuge from open-water temperature drops. This seasonal pattern, documented by the Islander News, drives the majority of documented winter sightings in Miami-Dade waters.

West Indian manatees in Miami are protected under three overlapping laws. The Florida Fish and Wildlife Conservation Commission documents that feeding, harassing, harming, pursuing, hunting, shooting, wounding, killing, annoying, or molesting a manatee is prohibited under the Marine Mammal Protection Act of 1972, the Endangered Species Act of 1973, and the Florida Manatee Sanctuary Act of 1978. All three statutes apply simultaneously in Florida waters, including Biscayne Bay and the waters adjacent to the City of Miami.

At the county level, the Miami-Dade County Department of the Environment operates a Manatee Protection Program in coordination with FWC. This program represents the primary local administrative layer between the state agency and Miami-area waterways. The FWC serves as the lead state enforcement body for manatee-related violations.

The species' status as Florida's official State Marine Mammal, designated by the state legislature in 1975 as documented by the Florida Department of State, reflects the animal's cultural and ecological significance in state governance, separate from the federal threatened species listing that drives the primary enforcement framework. The Biscayne Bay Foundation, a nonprofit organization focused on bay conservation, also documents the applicable protection laws as part of its public education materials on manatee stewardship in the Biscayne Bay watershed.

Several specific locations in and near Miami have been identified by authoritative sources as sites where manatees are regularly observed. The Biscayne Bay Foundation identifies the harbor just north of the Biscayne National Park Visitor's Center as one of the documented observation sites in the area, noting that kayak and canoe access to the bay is one means by which the animals are observed from a non-motorized platform.

The Islander News, the community newspaper of Key Biscayne, reports that residents near Key Biscayne have documented manatee sightings near the Mashta Bridge and along the bay, particularly during the November-through-March winter season when the animals seek warmer, shallower water in the inshore zone.

The Deering Estate — a Miami-Dade County historic site situated on Biscayne Bay in the southern part of the county — is identified in the research record as a documented manatee congregation site, attributed to the combination of freshwater supply from the site's spring and the calm, sheltered bay conditions. Biscayne National Park, which extends south from the city's immediate coastal zone, is administered by the National Park Service and encompasses a portion of the primary manatee range documented in the broader Biscayne Bay Habitat Focus Area established by NOAA in 2015.

The most significant recent development affecting Biscayne Bay manatees involves the ongoing decline of seagrass habitat. As reported by the National Park Service Traveler in April 2026, NOAA Fisheries initiated a $9.4-million seagrass restoration effort in 2023; the effort has produced seagrass reappearance in some parts of Florida's coastal lagoon systems, but the same report notes that progress is slow and seagrass continues to decline in Biscayne Bay, the Florida Panhandle, and other water bodies statewide.

The Save the Manatee Club reports that while the federal Unusual Mortality Event (UME) for manatees has officially ended, the organization characterizes the species and its habitat as remaining under threat and identifies continued federal and state funding for recovery programs as necessary for sustained population stability. The UME, which drove record manatee deaths in Florida in 2021 and 2022, was closely tied to catastrophic seagrass loss in the Indian River Lagoon; the connection between seagrass decline and mortality documented in that system has heightened attention to analogous seagrass conditions in Biscayne Bay.

The NOAA Habitat Blueprint documents that its Biscayne Bay partnership with Biscayne National Park and Miami-Dade County includes participation in the Comprehensive Everglades Restoration Project, a multi-decade federal-state initiative designed to restore the hydrology of south Florida's ecosystems and connected coastal waters — conditions that directly influence water quality and seagrass persistence in the bay.

Manatee conservation in Miami sits within a layered jurisdictional structure spanning the city, Miami-Dade County, the State of Florida, and multiple federal agencies. At the federal level, NOAA Fisheries holds primary authority over the Biscayne Bay Habitat Focus Area designation, while the National Park Service administers Biscayne National Park — the southernmost component of the bay's manatee range within the Miami metropolitan area. The NOAA site characterization for Biscayne National Park describes the park as a unique tropical marine environment whose coral reef habitats contribute substantially to the multibillion-dollar tourism and fishing industry, situating manatee habitat alongside a broader economic and ecological framework.

The NOAA Habitat Focus Area designation encompasses not only Biscayne National Park but also the Florida DEP Biscayne Bay Aquatic Preserves and the northern extension of the Florida Keys National Marine Sanctuary, creating a continuous protected corridor that extends southward from Miami's coastal boundary. This corridor forms the northern segment of a connected manatee range that runs through the Florida Keys and into Florida Bay.

Miami-Dade County's Manatee Protection Program, operated by the Department of the Environment, functions as the county-level administrative interface between statewide FWC enforcement and local waterway management. The NOAA Habitat Blueprint identifies this county partnership as a key component of the bay's water quality monitoring network, linking local governance to the multi-agency research apparatus tracking seagrass and habitat conditions that underpin the manatee population's long-term viability in the Miami area.