West Indian Manatee (Trichechus manatus)

Status: needs expert review. Taxonomic note: the West Indian manatee is a sirenian (order Sirenia, family Trichechidae), not a pinniped or cetacean. Because Blue Life Commons' species_group enum covers only cetaceans, pinnipeds, turtles, sharks-rays, and reefs, this page omits species_group rather than misclassify the taxon. Conservation and threat claims cite the IUCN Red List and U.S. Fish & Wildlife Service; a reviewer should confirm currency and subspecies detail before approval.

At a glance

Field	Value	Source
Scientific name	Trichechus manatus	WoRMS / authority
Taxon	sirenian (order Sirenia — "sea cows"); not a pinniped	—
IUCN status	Vulnerable (assessed 2023)	IUCN Red List
Population trend	Decreasing (global)	IUCN Red List
Subspecies	Florida manatee (T. m. latirostris) and Antillean manatee (T. m. manatus)	IUCN Red List
U.S. legal status	ESA Threatened (reclassified from Endangered, effective 2017); existing protections retained	USFWS
Range	Southeastern U.S., Gulf of Mexico, Caribbean, and to northeastern South America	IUCN Red List

Identification

A large, slow-moving, fully aquatic herbivore with a rounded, seal-shaped body, paddle-like fore-flippers, and a broad, flattened, spoon-shaped tail (distinguishing manatees from the fluke-tailed dugong). The face has a squared, whiskered muzzle adapted for grazing. Manatees surface periodically to breathe and are often seen grazing on seagrass and other aquatic vegetation in warm, shallow coastal and riverine waters.

Ecology and behavior

Manatees graze on seagrasses and other aquatic plants and depend on warm water in winter at the northern edge of their range, gathering at natural springs and industrial warm-water outflows when temperatures drop (USFWS). The species comprises two subspecies — the Florida manatee and the Antillean manatee — with different regional conservation pictures (IUCN Red List). Specific aggregation sites are kept to regional granularity here. Behavioral specifics should be cited to published research and confirmed in review.

Conservation status and threats

The West Indian manatee is assessed Vulnerable by the IUCN (2023), with a decreasing global trend (IUCN Red List). In the United States it was reclassified from Endangered to Threatened under the Endangered Species Act effective in 2017, on the basis of population increases and habitat improvements — while keeping existing federal protections and Florida critical-habitat designations in place (USFWS). "Threatened" is not "safe": watercraft collisions are a leading cause of injury and death, and the species is also pressured by loss of warm-water refuges, cold stress, seagrass habitat degradation, harmful algal blooms (red tide), entanglement, and (in parts of the Antillean range) hunting. Subspecies status differs, with Antillean populations in some countries facing more severe risk. Report figures as the cited authorities state them; a reviewer should confirm subspecies and regional specifics.

How to observe responsibly

Practice passive observation: keep at least 50 feet (about 15 m) from manatees, observe quietly from the surface, and never chase, touch, feed, give water to, or surround them — harassment is unlawful and even gentle contact can habituate manatees or alter behavior in ways that harm them (FWC). Paddlers should keep at least two kayak-lengths away, avoid splashing, and never separate a calf from its mother. Where in-water viewing is permitted, float at the surface and let the animal choose the distance. Warm-water winter aggregation sites are sensitive; follow site rules and the strictest local regulation (ETHICS.md).

How you can help

• Boat slow in posted manatee zones and wear polarized sunglasses to spot animals; most lethal strikes involve fast vessels.
• Report sick, injured, entangled, or dead manatees to the state or federal wildlife hotline rather than intervening yourself.
• Support seagrass restoration, warm-water-refuge protection, and credible manatee conservation organizations; never feed or give fresh water to wild manatees.