Spotted Gar

The Spotted Gar (Lepisosteus oculatus) is a member of Lepisosteidae, an ancient family of ray-finned fishes whose armored body plan has changed little in tens of millions of years. It ranges through slow, vegetated rivers, oxbow lakes, and swamps of the south-central and southeastern United States, from the Great Lakes basin south to the Gulf coast. As an air-breathing fish with a vascularized swim bladder, it can gulp atmospheric oxygen and survive in stagnant, low-oxygen water where few other fish persist. It is not currently considered threatened and remains widespread within its native range, though habitat loss has reduced numbers locally.

Spotted Gar are recognized by a mix of features:

• Elongated, nearly cylindrical body clad in hard, non-overlapping diamond (ganoid) scales
• Long, relatively narrow snout lined with sharp teeth
• Dense, round dark spots scattered across the head, body, and all fins, including the paddle-shaped caudal fin
• Olive to brown dorsal coloring fading to lighter, spotted flanks
• Dorsal and anal fins set far back near the tail

They are distinguished from the similar Florida Gar by fewer, more scattered spots and a slightly narrower snout, and from Longnose Gar by a shorter, broader jaw.

Spotted Gar prefer clear to moderately turbid, sluggish freshwater habitats with abundant aquatic vegetation, including backwaters, oxbow lakes, swamps, and slow river pools. They tolerate low-oxygen conditions thanks to their ability to breathe air at the surface, allowing them to occupy stagnant sloughs and weedy shallows avoided by many other predatory fish. Their range covers the lower Great Lakes and Mississippi River drainage south through Gulf coastal states, generally in warm, freshwater systems, occasionally straying into slightly brackish coastal marshes near river mouths.

This species is a solitary, ambush predator that hovers motionlessly near cover before lunging sideways to snatch small fish and crustaceans with a quick sweep of its toothy jaws. Spotted Gar frequently rise to gulp air at the surface, a behavior that supplements gill respiration in warm, oxygen-poor water. Spawning occurs in spring in shallow, vegetated water, where adhesive eggs are scattered over plants and left unguarded. Juveniles hide among aquatic vegetation, using camouflage and stillness to avoid larger predators while they grow.