The Cuban Gar (Manjuarí) is a massive, ancient ambush predator native to the fresh and brackish waters of Cuba. It features a crocodilian snout, heavy armor-like scales, and a torpedo-shaped body. Due to its extreme adult size, it is strictly recommended only for expert aquarists with indoor ponds or enormous custom tanks. It will swallow any tank mate small enough to fit in its jaws, but generally ignores fish that are too large to eat.
Cuban Gar At a Glance
Cuban Gar Tank Requirements
Will Cuban Gar fit in your tank?
Care guides tell you what Cuban Gar needs, the next question is whether your tank can safely provide it. Test Cuban Gar against your tank size, maintenance needs, and the fish you already keep before you buy.
Cuban Gar Water Parameters
Cuban Gar Temperament & Compatibility
Cuban Gar Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard (Adult)
The fully mature adult. Requires heavy-duty pond-level filtration, enormous swimming space, and a highly secure, heavy lid to prevent fatal jumping injuries. Keep only with equally large, deep-bodied tank mates.
Same care requirements as the base species
Also known as: Full Grown, Monster
Juvenile (Grow-out)
Young Gars grow exceptionally fast. While they can be temporarily housed in a standard 6-foot aquarium during their first year, an upgrade plan for a massive custom setup or pond must already be in place.
Differs in 5 traits from base species
Also known as: Baby Gar, Juvenile Gar
Cuban Gar Care Guide Summary
The Cuban Gar, scientifically known as Atractosteus tristoechus, belongs to the Oddballs family group. Adults reach a maximum size of approximately 150 cm and have a fusiform body shape with a moderate growth rate. Classified as semi-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 Cuban Gar requires a brackish tolerant aquarium with a minimum volume of 3785 litres and a tank length of at least 300 cm. Water temperature should be maintained between 22°C and 30°C, with a pH range of 6.5–8 and a general hardness of 8–20 dGH. A moderate water flow is preferred.
The Cuban Gar is a rewarding species to keep, provided its core environmental needs are met. This species is available in 2 varieties: Standard (Adult) 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.
Cuban Gar Habitat Setup
When setting up an aquarium for the Cuban Gar, a moderate 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 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.
Cuban Gar Compatibility Notes
Classified as semi-aggressive, the Cuban 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. Selecting tankmates that favour different water layers from the surface and mid-level zones can help reduce competition and territorial overlap.
Who Cuban Gar Is Actually For
Cuban Gar is best for a fishkeeper who wants a species that can settle into a calmer community setup 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 smooth gravel.
The most common mistake is buying Cuban Gar for looks first and only later discovering how its adult size, behavior, or bioload changes the whole tank plan. 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 Cuban Gar
How big does Cuban Gar get?
Cuban Gar (Atractosteus tristoechus) typically reaches a maximum adult size of approximately 150 cm. They have a fusiform body shape and a moderate growth rate.
What tank size does Cuban Gar need?
A minimum aquarium volume of 3785 litres and a tank length of at least 300 cm are recommended for Cuban Gar. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Cuban Gar need?
Cuban Gar thrives in brackish tolerant conditions with a temperature range of 22–30°C, a pH between 6.5 and 8, and a general hardness of 8–20 dGH. A moderate water flow is preferred.
Is Cuban Gar peaceful or aggressive?
Cuban Gar is classified as semi-aggressive with an aggression score of 6 out of 10. They can work in community setups but may clash with certain tankmates.
Can Cuban Gar live alone?
Yes, Cuban Gar can be kept singly or in a group. They are flexible and adapt well to both setups.
Does Cuban Gar have any special tank requirements?
Yes. Cuban Gar benefits from smooth gravel (sensitive barbels) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Does Cuban Gar need a lid on the tank?
Yes. Cuban 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 4, 2026
- Last updated
- May 4, 2026
- Issues or corrections?
- Contact the editorial team
Plants That Suit Cuban Gar
These plants pair well with Cuban Gar based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
African Onion Plant
Crinum calamistratum
Afzel's Anubias
Anubias afzelii
Amazon Sword
Echinodorus amazonicus
Anacharis
Egeria densa
Anubias Barteri
Anubias barteri
Baby Tears
Lindernia rotundifolia
Fish Similar to Cuban Gar
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.
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.
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.
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.
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.
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.