Alligator gar 8-10cm

The Alligator Gar (Atractosteus spatula) is an ancient and fascinating freshwater predator, often referred to as a living fossil due to its lineage dating back over 100 million years. Recognized for its elongated snout, sharp teeth, and armor-like scales, the Alligator Gar is one of the largest freshwater fish species in the world.

At 8–10 cm, these juveniles look small and manageable, but they can grow to an astonishing 150–200 cm (5–6.5 feet) or more in captivity. This species is suitable only for experienced aquarists with massive tanks or outdoor ponds, offering a true centerpiece for monster fish setups.

✅ Key Features

• Size: Juveniles 8–10 cm; adults grow up to 150–200 cm

• Temperament: Predatory but generally calm toward similarly large species

• Care Level: Advanced (requires very large tank and strong filtration)

• Lifespan: 20–50 years in captivity

• Special Trait: Ganoid scales for armor-like protection and long, crocodile-like snout

Care Guide for Alligator Gar

✅ Tank Requirements

• Minimum Tank Size: 1,200 liters (300 gallons) for juveniles; much larger for adults

• Aquascape: Open swimming space with minimal sharp decorations

• Filtration: Extremely powerful filtration (sump or large canister) for heavy bioload

• Lighting: Moderate

• Lid Required: Heavy, secure lid to prevent escapes

✅ Water Parameters

• Temperature: 22°C – 28°C (72°F – 82°F)

• pH Level: 6.5 – 7.8

• Water Hardness: Soft to moderately hard

• Maintenance: Weekly 30–40% water changes for pristine conditions

✅ Feeding Habits

Alligator Gar are carnivorous ambush predators with strong feeding instincts.

• Recommended Diet:

  • Fresh or frozen fish fillets

  • Shrimp and prawns

  • Pellets for large carnivorous fish (as they adapt)

Feed once daily for juveniles; reduce frequency as they grow larger. Avoid overfeeding to maintain water quality.

✅ Tank Mates

Due to their predatory size and strength, tank mates must be large and equally robust.

Suitable Tank Mates:

• Arowanas

• Pacu

• Giant Catfish species (Pimelodids, Doradids)

• Large Cichlids (Oscar, Peacock Bass)

Avoid small or medium fish—they will be eaten.

✅ Behavior & Personality

• Behavior: Generally calm but highly predatory

• Activity: Prefers open swimming areas and surface level

• Unique Feature: Can gulp atmospheric air when oxygen levels are low

Why Choose Alligator Gar?

• Prehistoric look with armored scales and iconic long snout

• A true monster fish centerpiece for massive tanks or ponds

• Incredible lifespan and unique behavior

✅ Perfect for advanced aquarists and public displays
✅ A rare, majestic species for true monster fish enthusiasts