Gar (e.g. Atractosteus spatula)

FishFreshwaterLiving fossil

Overview

Gars (family Lepisosteidae) are ancient, long-bodied predatory fish of North and Central America, easily known by their cylindrical shape, long jaws full of sharp teeth, and tough armour of hard, diamond-shaped scales. They belong to a very old lineage and are often called “living fossils” — their relatives swam in the age of the dinosaurs. The alligator gar (Atractosteus spatula), shown here, is the largest, a true freshwater giant that can exceed 2–3 metres.

Gars are also remarkable for breathing air: they can gulp air at the surface into a specialised swim bladder that works like a lung, letting them survive in warm, stagnant, low-oxygen water.

Note: there are several gar species; details here use the alligator gar as a reference. Treat general statements as approximate and verify against authoritative sources.

Habitat & Range

Gars live in fresh and brackish waters of North and Central America — rivers, lakes, swamps, backwaters, and floodplains — generally favouring slow, warm, often weedy water. The alligator gar inhabits large rivers, reservoirs, and coastal bays of the southern United States and into Mexico, sometimes venturing into brackish or marine water.

Diet

Gars are ambush predators that feed mainly on fish, plus crustaceans, waterbirds, and small animals at the surface. They hang motionless near the surface or in cover, looking like a floating log, then strike sideways with their long, tooth-lined jaws to seize prey. The giant alligator gar can take quite large fish and other sizeable prey.

Behavior

Gars are slow, patient hunters that rely on stealth and a sudden sideways snap rather than active pursuit. Their air-gulping ability lets them thrive where other fish would suffocate, and they can often be seen rising to break the surface for a breath. Their hard, interlocking scales (made of a tough, enamel-like material) form effective armour against predators. Gars are long-lived and slow to mature, and the alligator gar in particular grows very large over many years.

Human Interaction & Conservation

Gars have often been wrongly persecuted as “trash fish” or threats to game fish, but they are now increasingly valued as native predators that help keep ecosystems balanced, and the alligator gar is a prized catch in recreational fishing. They are harmless to people (their eggs, however, are toxic if eaten). Some populations, especially of the slow-breeding alligator gar, have declined and are now managed and protected in places. Consult authoritative sources for status.

More photos of the gar