Shortnose Gar
Lepisosteus platostomus
A primitive, highly predatory North American 'monster fish' with a long, tooth-filled snout and armor-like ganoid scales. They are ambush predators that require massive aquariums or indoor ponds. They breathe atmospheric air via a modified swim bladder. Due to their size and predatory nature, they will consume any tank mate small enough to fit in their mouths.
Shortnose Gar At a Glance
Shortnose Gar Tank Requirements
Will Shortnose Gar fit in your tank?
Care guides tell you what Shortnose Gar needs, the next question is whether your tank can safely provide it. Test Shortnose Gar against your tank size, maintenance needs, and the fish you already keep before you buy.
Shortnose Gar Water Parameters
Shortnose Gar Temperament & Compatibility
Shortnose Gar Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Adult / Standard
The fully grown adult form. Requires a massive custom aquarium or indoor pond. Tank mates must be similarly large and robust to avoid being eaten.
Differs in 1 trait from base species
Also known as: Adult Gar, Full Size Gar
Juvenile (Grow-out)
Juvenile Shortnose Gars are often sold small but will rapidly outgrow standard aquariums. They require a dedicated grow-out tank with heavy filtration and must be upgraded frequently as they grow.
Differs in 5 traits from base species
Also known as: Baby Gar, Juvenile Gar
Shortnose Gar Care Guide Summary
The Shortnose Gar, scientifically known as Lepisosteus platostomus, belongs to the Oddballs family group. Adults reach a maximum size of approximately 80 cm and have a fusiform body shape with a moderate growth rate. Classified as aggressive, this species primarily occupies the surface and mid-level zones of the aquarium and produces a extreme level of biological waste.
To thrive, the Shortnose Gar requires a freshwater only aquarium with a minimum volume of 1000 litres and a tank length of at least 240 cm. Water temperature should be maintained between 10°C and 28°C, with a pH range of 6–8 and a general hardness of 5–20 dGH. A low water flow is preferred.
Due to its specialist needs, the Shortnose Gar is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 2 varieties: Adult / Standard and Juvenile (Grow-out). Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.
Shortnose Gar Habitat Setup
When setting up an aquarium for the Shortnose Gar, a low water flow best suits their natural preferences. Because this species occupies the surface and mid-level zones, the aquarium layout should prioritise adequate surface area with floating cover to make them feel secure near the waterline and open swimming space in the centre of the tank for free movement. Useful additions include a sand substrate to accommodate their sifting behaviour and smooth gravel or rounded substrate to protect their sensitive barbels. Keepers should note that a tight-fitting lid is essential, as this species is a known jumper.
Shortnose Gar Compatibility Notes
Classified as aggressive, the Shortnose Gar is adaptable and can be kept singly or in a small group, offering flexibility when planning a community tank. When choosing tankmates, any fish small enough to fit in its mouth will likely be eaten and their energetic swimming style may stress more sedentary or timid species. Selecting tankmates that favour different water layers from the surface and mid-level zones can help reduce competition and territorial overlap.
Who Shortnose Gar Is Actually For
Shortnose Gar is best for a fishkeeper who expects a species with attitude and plans the tank around that behavior and can provide someone who understands its individual space requirements. It makes the most sense for a hobbyist who will actually build around its needs, especially sand.
The most common mistake is treating Shortnose Gar like any other community fish and skipping the soft sand it needs to forage safely. Another frequent problem is forcing it into an over-busy community when it would do better with more room or more deliberate tankmate choices.
Frequently Asked Questions About Shortnose Gar
How big does Shortnose Gar get?
Shortnose Gar (Lepisosteus platostomus) typically reaches a maximum adult size of approximately 80 cm. They have a fusiform body shape and a moderate growth rate.
What tank size does Shortnose Gar need?
A minimum aquarium volume of 1000 litres and a tank length of at least 240 cm are recommended for Shortnose Gar. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Shortnose Gar need?
Shortnose Gar thrives in freshwater only conditions with a temperature range of 10–28°C, a pH between 6 and 8, and a general hardness of 5–20 dGH. A low water flow is preferred.
Is Shortnose Gar peaceful or aggressive?
Shortnose Gar is classified as aggressive with an aggression score of 7 out of 10. Careful tankmate selection is essential to avoid conflict.
Can Shortnose Gar live alone?
Yes, Shortnose Gar can be kept singly or in a group. They are flexible and adapt well to both setups.
Does Shortnose Gar have any special tank requirements?
Yes. Shortnose Gar benefits from sand (sifters) and smooth gravel (sensitive barbels) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Does Shortnose Gar need a lid on the tank?
Yes. Shortnose Gar is a known jumper, and a tight-fitting lid or cover is essential to prevent escape. Even a small gap can be enough for a determined fish to leap out.
Useful setup supplies
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Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- May 11, 2026
- Last updated
- May 11, 2026
- Issues or corrections?
- Contact the editorial team
Plants That Suit Shortnose Gar
These plants pair well with Shortnose Gar based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
Amazon Frogbit
Limnobium laevigatum
Asian Watergrass
Hygroryza aristata
Asian Watermoss
Salvinia cucullata
Banana Plant
Nymphoides aquatica
Beckett's Water Trumpet
Cryptocoryne beckettii
Broad-leaved Crypt
Cryptocoryne pontederiifolia
Fish Similar to Shortnose Gar
Longnose Gar
Lepisosteus osseus
A primitive, highly predatory fish native to North America. Known for its extremely elongated snout filled with teeth and tough, armor-like ganoid scales. As an ambush predator that breathes atmospheric air, it often hovers motionless near the surface. Due to its massive adult size, it is strictly considered a 'Monster Fish' suitable only for massive custom enclosures, indoor ponds, or public aquariums. It will consume any tank mate small enough to fit in its mouth.
Spotted Gar
Lepisosteus oculatus
A primitive, predatory 'monster fish' native to North America. Known for its heavily armored, elongated body and beak-like mouth filled with sharp teeth. As an ambush predator, it rests near the surface disguised as a floating log. It breathes atmospheric air using a modified swim bladder. Suitable only for expert aquarists with massive aquariums or indoor ponds.
Alligator Gar
Atractosteus spatula
A massive, primitive ambush predator native to North and Central America, known for its crocodilian snout and armor-like ganoid scales. They grow to enormous sizes and are strictly for public aquaria or highly advanced monster fish keepers with massive custom indoor ponds. They are air-breathers and incredibly hardy, but their size makes them entirely unsuitable for standard home aquariums.
Florida Gar
Lepisosteus platyrhincus
A prehistoric, heavily armored ambush predator native to the southeastern United States. They possess an elongated, torpedo-like body and a beak filled with sharp teeth. As an apex predator, they will consume any tank mate that fits in their mouths, but are generally peaceful toward fish too large to eat. They require massive aquariums and a secure, weighted lid due to their powerful jumping capability.
Tropical Gar
Atractosteus tropicus
An ancient, heavily armored ambush predator native to Central America. They are true 'monster fish' that require massive aquariums or heated indoor ponds. They possess a modified swim bladder that acts as a lung, allowing them to breathe atmospheric air. They are strict piscivores and will consume any tank mate small enough to fit in their mouths.
Needlenose Gar
Xenentodon cancila
A fascinating, highly predatory surface-dwelling fish with a long, beak-like mouth filled with sharp teeth. Despite the common name, it is a needlefish, not a true gar. They are notoriously skittish and prone to fatal jumping or injuring their delicate snouts on tank walls if startled. They strictly require a tight-fitting lid and a very long tank with open swimming space at the surface.