Gar are overwhelmingly fish-eaters. Across all seven living species, the bulk of their diet consists of whatever small to medium-sized fish share their waters, from shad and minnows to mullet and killifish. But they are not as one-dimensional as their reputation suggests. Depending on the species, season, and body size, gar also eat crustaceans, amphibians, insects, and the occasional small mammal or bird that wanders too close to the surface.
The Core Wild Diet
Most research on gar feeding habits points to the same conclusion: fish dominate. A study of longnose gar in coastal habitats found the most common prey families were herrings, drums, shrimp, killifish, and mullet, with the heaviest feeding occurring in autumn.1PubMed. Prey composition and ontogenetic shift in coastal populations of longnose gar Lepisosteus osseus That lineup reflects what was locally abundant rather than any narrow preference. Gar are opportunists at heart. They eat what is available, and in most North American freshwater and brackish environments, that means soft-rayed schooling fish like shad, herring, and minnows.
Alligator gar, the largest of the group and capable of exceeding two meters in length, eat proportionally larger prey. Adults regularly take sizeable buffalo fish, carp, and drum. There are documented cases of alligator gar stomachs containing waterfowl and small mammals, though these appear to be opportunistic grabs rather than a dietary staple. The image of a gar eating ducks makes for good storytelling, but fish make up the vast majority of meals even for the biggest individuals.
Historically, gar have been characterized almost exclusively as piscivorous predators, with most scientific investigations focusing on their dietary habits rather than their broader role in aquatic communities.2Freshwater Biology. A Reappraisal of Gars and Bowfins in Fishery Management That narrow framing has contributed to a longstanding misperception that gar are harmful “trash fish” competing with more desirable gamefish. In reality, gar tend to target slow, schooling species rather than bass or crappie, and they fill a legitimate ecological niche as top predators in warm, low-oxygen habitats where few other large predators thrive.
How Diet Changes as Gar Grow
Young gar do not eat the same things as adults. When longnose gar are small, roughly under 400 millimeters, they feed primarily on bottom-dwelling prey like killifish (family Fundulidae), which sit relatively low on the food chain. As the fish grow past about 600 millimeters, their diet shifts toward open-water schooling fish like herrings (family Clupeidae), which are higher on the food chain.1PubMed. Prey composition and ontogenetic shift in coastal populations of longnose gar Lepisosteus osseus This shift makes intuitive sense. A small gar with a narrow snout can handle tiny minnows and invertebrates near the bottom. A large gar has the body size and jaw length to ambush faster, more energy-rich prey in open water.
This growth-related shift has practical implications. If you are trying to catch or feed juvenile gar, small invertebrates and tiny fish are appropriate. For adults, you want to match the profile of whatever mid-water schooling fish live in that body of water. In a reservoir full of gizzard shad, that means shad. In a coastal estuary, it may mean mullet or menhaden.
Not All Gar Species Eat the Same Things
One of the more interesting findings in gar research is how little dietary overlap exists between closely related species sharing the same water. Spotted gar and shortnose gar, two similar-sized species found throughout the Mississippi River basin, had only about 33% diet overlap during summer flooding, meaning roughly two-thirds of what they ate was different.3Ecology of Freshwater Fish. Differences in diet and feeding ecology of similar‐sized spotted (Lepisosteus oculatus) and shortnose (Lepisosteus platostomus) gars during flooding of a south‐eastern US river Spotted gar ate significantly more fish and crustaceans by weight, while shortnose gar consumed more amphibians and terrestrial invertebrates.
That distinction is worth knowing if you are targeting a specific species. Spotted gar respond well to fish-based baits and lures that mimic small baitfish or crayfish. Shortnose gar, by contrast, might be more willing to hit something unusual, like a nightcrawler or a chunk of frog, because their natural diet includes a wider variety of non-fish prey. Alligator gar, with their broader snouts and larger gape, are the least selective of the group and will take almost anything that fits in their mouth, though cut bait from oily fish like carp or buffalo tends to be the go-to for serious trophy hunters.
Florida gar and longnose gar generally fall on the more fish-focused end of the spectrum, with longnose gar being especially partial to herring, shad, and mullet in coastal areas. The Cuban gar and tropical gar, both members of the broad-snouted Atractosteus genus alongside alligator gar, are less well-studied in terms of wild diet, but available evidence suggests they follow a similar pattern of heavy piscivory supplemented by crustaceans and occasional oddities.
How Gar Actually Hunt
Understanding what gar eat is easier when you understand how they catch it. Gar are ambush predators. They hover motionless near the surface or alongside structure, waiting for prey to drift within striking range. When a target gets close enough, the gar lunges with a fast lateral snap of the head, clamping its elongated jaws shut on the prey sideways before repositioning to swallow it headfirst.
That lateral-snapping strike is the signature hunting mode of the Lepisosteus genus, which includes longnose, shortnose, spotted, and Florida gar. The narrow snout acts almost like a pair of forceps, swinging through the water with minimal drag and catching prey from the side. Alligator gar work differently. Research into their feeding mechanics has shown that the broader skull of alligator gar allows for a wider gape and more complex jaw movements, with a sliding upper jaw, flexible joints in the skull, and a retractable pectoral girdle that together give their feeding apparatus a greater range of motion than their narrower-snouted relatives.4PubMed. Feeding kinematics and morphology of the alligator gar (Atractosteus spatula, Lacépède, 1803) In practice, this means alligator gar can handle bulkier prey and do not rely as heavily on the precise sideways snapping motion.
One thing all gar share is that they are not built for sustained pursuit. Their bodies are encased in heavy, interlocking ganoid scales that function as armor. These scales come at a cost to explosive speed. Compared to a similarly sized predatory fish without armor, longnose gar produce significantly less power during a fast-start burst, averaging about 65% of the work output. The heavy skin itself accounts for roughly 90% of that performance gap.5Canadian Journal of Zoology. The effect of armored skin on the swimming of longnose gar, Lepisosteus osseus At cruising speeds, though, the armor does not add meaningful drag, so gar move through the water efficiently as long as they are not sprinting.
This trade-off explains a lot about gar feeding behavior. They are patient stalkers, not open-water chasers. They position themselves near prey, wait for the right moment, and explode into a short lunge. If they miss, they usually reset and wait rather than chasing. For anglers, this means presentations need to come close to where a gar is holding. Long retrieves across open water are less effective than placing a bait near visible gar and letting it sit.
Feeding Tips for Anglers
Gar have a well-earned reputation for being difficult to hook with conventional tackle, and it starts with their mouth. The bony, elongated jaws do not offer the soft tissue that a hook easily penetrates. Many anglers switch to rope lures or nylon frays specifically designed to tangle in the gar’s teeth rather than relying on a hook point to stick. These rope flies are cheap to make and surprisingly effective, especially for longnose and spotted gar.
If you prefer traditional bait, cut fish is the most reliable option across all gar species. Fresh-cut shad, mullet, or carp strips work well because they release scent and oils into the water, drawing gar in from downstream. Live baitfish on a float rig is another proven approach: suspend a shiner, shad, or small sunfish a foot or two below a bobber, and let the gar find it. When a gar picks up a live bait, resist the urge to set the hook immediately. Gar typically grab prey crosswise, hold it, reposition it headfirst, and then swallow. If you set too early, you pull the bait right out of those bony jaws. Give the fish at least 15 to 30 seconds, sometimes longer, before setting up.
For lure fishing, anything that mimics a wounded baitfish can trigger a strike. Soft plastic jerkbaits and swimbaits in natural shad or minnow colors work, as do topwater plugs during warm months when gar are rolling on the surface. Retrieval speed should generally be slow. Gar are ambush predators waiting for easy meals, not chasing down fast-moving targets. A slow, erratic retrieve that makes the lure look injured is more convincing than a steady crank.
Location matters as much as bait selection. Look for gar near current seams, logjams, bridge pilings, and the mouths of backwater sloughs. On still days, watch for gar rolling at the surface to gulp air, a behavior enabled by their specialized swim bladder that functions partly as a lung. Where you see gar surfacing, that is where you fish. In summer, gar often stack up in shallow backwaters and oxbow lakes where dissolved oxygen drops low enough to push out competing predators. Their ability to breathe air gives them an edge in these oxygen-poor environments, and they can be found in astonishing densities where other fish have moved out.
Feeding Gar in Captivity
Keeping gar in aquariums or ponds is increasingly popular among hobbyists, and feeding is one of the first challenges new keepers encounter. In captivity, most gar species adapt readily to dead food once they realize it is available, but the transition from live prey takes some patience. Juvenile gar in particular tend to be wired for movement and may initially ignore anything that is not swimming. Offering live feeder fish, ghost shrimp, or small crayfish during the acclimation period helps establish a feeding response. From there, many keepers gradually introduce cut fish, frozen silversides, and shrimp, often by wiggling the food with feeding tongs to simulate movement.
Research into gar aquaculture has shown that even very young gar can digest artificial feeds, with their digestive enzyme profiles suggesting readiness for formulated diets from early developmental stages.6Ecology of Freshwater Fish. Gar biology and culture: status and prospects In practice, commercial pellet foods designed for carnivorous fish can work as a staple diet for captive gar, though most keepers supplement with frozen or fresh whole fish to ensure a complete nutritional profile. A diet of feeder goldfish alone is a common mistake. Goldfish contain an enzyme that breaks down thiamine (vitamin B1), and a steady diet of them can lead to deficiency over time. Varied whole fish, shrimp, and quality pellets make a healthier foundation.
Overfeeding is another common error. In the wild, gar do not eat every day. Their metabolism, while not sluggish, is geared for periodic large meals rather than constant grazing. Most experienced keepers feed juvenile gar every two to three days and adults just once or twice a week. A gar with a visibly distended belly after every feeding is being overfed. Obesity in captive gar leads to fatty liver disease and shortened lifespan, just as it does in other predatory fish.
Seasonal Patterns and Water Temperature
Gar feeding intensity tracks water temperature closely. In spring, as water warms past about 15°C (60°F), gar become increasingly active and begin feeding more aggressively after a sluggish winter. Peak feeding for most species occurs in late spring through early fall, with the highest consumption rates documented in autumn for longnose gar in coastal habitats.1PubMed. Prey composition and ontogenetic shift in coastal populations of longnose gar Lepisosteus osseus This autumn spike likely reflects pre-winter caloric loading, similar to what many freshwater predators do before metabolism slows during cold months.
During winter, gar in northern parts of their range feed very little. They retreat to deeper, slower water and their metabolism drops along with the temperature. Anglers targeting gar in winter need to adjust expectations accordingly: bites are rare, strikes are lethargic, and dead bait fished extremely slowly on the bottom is about the only approach that produces. In the southern United States, where water temperatures rarely drop below 10°C for extended periods, gar remain somewhat active year-round, though feeding still slows during the coldest weeks.
Flooding events also reshape what gar eat. When rivers overflow into surrounding floodplains, gar follow the water into shallow, food-rich habitats. The study comparing spotted and shortnose gar diets was conducted specifically during summer flooding, and the results showed that expanded habitat availability allowed the two species to partition resources more distinctly, with shortnose gar picking up amphibians and terrestrial insects that only become accessible when water covers land.3Ecology of Freshwater Fish. Differences in diet and feeding ecology of similar‐sized spotted (Lepisosteus oculatus) and shortnose (Lepisosteus platostomus) gars during flooding of a south‐eastern US river For anglers, this means floodplain fishing for gar can be exceptional, but the rules change. Conventional baitfish patterns still work for spotted gar, while shortnose gar in flooded timber may respond better to unconventional baits.
The “Trash Fish” Misunderstanding and What Gar Actually Do for a Fishery
For decades, gar were vilified by fishery managers and anglers alike as voracious predators that decimated gamefish populations. State agencies organized gar eradication programs, and tournament anglers killed gar on sight under the assumption they were eating all the bass and crappie. The science does not support that narrative. Gar diets are dominated by soft-rayed, schooling forage fish rather than gamefish. Shad, herring, and minnows vastly outnumber bass or crappie in stomach content analyses across multiple species and geographies.
Gar actually serve a stabilizing role in warm-water ecosystems. By feeding heavily on forage fish that reproduce in enormous numbers, gar help keep those populations in check, which prevents the boom-and-bust cycles that can degrade water quality and crash entire food webs. In waters where gar have been removed or severely reduced, forage fish populations sometimes explode, leading to stunted growth, increased competition for zooplankton, and cascading effects that ultimately hurt the gamefish populations people were trying to protect. The shift in management thinking over the past few decades has been toward recognizing gar as a legitimate component of healthy fisheries rather than a problem to be eliminated.
Alligator gar in particular have benefited from this reassessment. Once nearly extirpated from the northern parts of their range through dam construction, habitat loss, and deliberate culling, alligator gar are now the subject of active reintroduction programs in states like Illinois, Tennessee, and Kentucky. Their value as both a top predator and an increasingly popular sportfish has finally caught up with what the stomach-content data has been saying all along: gar eat forage fish, not your bass.