The Alligator Gar (Atractosteus spatula) is a massive, ancient freshwater fish native to North America, recognized for its long torpedo-shaped body, armored ganoid scales, and formidable jaw filled with sharp teeth. It requires an extremely large aquarium or pond with open swimming space, heavy filtration, and secure lids, as it is a powerful and agile predator. Alligator Gars are solitary and aggressive, best housed alone or with very large, robust tankmates, as they will eat smaller fish. They are carnivorous, feeding primarily on live or frozen prey such as fish, shrimp, and other meaty foods, and they may take some prepared diets over time. Maintaining clean water, stable parameters, and ample space is critical for their health, and they can live several decades with proper care, growing up to 10 feet in the wild (though smaller in captivity). This species is suited only for highly experienced aquarists with large-scale setups.
| Parameter | Requirement |
|---|---|
| Scientific Name | Atractosteus spatula (Alligator Gar) |
| Tank/Pond Size | Minimum 500+ gallons or large outdoor pond |
| Temperature | 22–28°C (72–82°F) |
| pH Range | 6.5–7.5 |
| Water Hardness | Moderate (10–20 dGH) |
| Substrate | Sand or smooth gravel with open swimming areas |
| Diet | Carnivorous – live or frozen fish, shrimp, other meaty foods |
| Temperament | Aggressive predator; solitary |
| Social Behavior | Solitary; will attack smaller fish |
| Breeding | Rare in captivity; egg layer |
| Lifespan | 20–50+ years in large ponds or aquariums |