The Xingu I Pike Cichlid (Lugubria sp. ‘Xingu I’), formerly known as Crenicichla sp. ‘Xingu I’, is a large, powerful predatory cichlid endemic to Brazil’s Rio Xingu Basin.
Juveniles are especially striking, often displaying brilliant:
coloration with a contrasting dark horizontal stripe.
As the fish matures, its coloration changes dramatically. Adult males generally become more:
while retaining attractive reddish or orange fins.
Mature females can become even more impressive, developing a brilliant:
when sexually mature or in breeding condition.
Xingu I belongs to a group of large rheophilic pike cichlids adapted to the fast-flowing, rocky rapids of the Rio Xingu. Adults are powerful, territorial predators requiring a very large aquarium, exceptionally good oxygenation, strong filtration, and carefully selected tankmates.
This listing is for:
For decades, this fish was known in the aquarium hobby as:
However, modern taxonomic work reorganized the large pike cichlid complex.
The former:
is now recognized as the genus:
Therefore, the modern aquarium identification is:
Despite being known to aquarists for decades:
Therefore:
and do not assign another named Lugubria species to it.
The correct identification remains:
Older:
will usually call this fish:
That information is not necessarily referring to a different fish.
It reflects the older classification before the genus:
was formally recognized.
Lugubria contains some of the largest pike cichlids.
Members of this group are characterized by:
Xingu I fits strongly within this group.
Young Xingu I are among the most colorful pike cichlids.
Small juveniles can be:
and then transition toward:
as they grow.
This vivid juvenile coloration is one reason Xingu I became so desirable in the aquarium hobby.
European aquarists have historically given young Xingu I the nickname:
because of their brilliant orange juvenile coloration and elongated body shape.
Customers should understand:
An orange juvenile will not necessarily remain completely orange as an adult.
This color change is:
and not evidence that the fish was mislabeled.
Adult males generally become more subdued than juveniles.
Typical adult male coloration includes:
with attractive:
unpaired fins.
Mature females can become spectacular.
When reproductively mature, females may develop:
while the:
may become substantially darker.
This produces one of the most dramatic breeding color patterns among large pike cichlids.
The same Xingu I can look completely different depending on:
For this reason:
Xingu I should not be confused with:
formerly:
Both originate from the Xingu Basin but represent distinct undescribed forms.
Xingu I is especially known for:
Xingu II generally has a different:
and historically has also been referred to as:
Do not combine Xingu I and Xingu II simply because both come from the same river.
The fish historically known as:
was eventually scientifically described as:
formerly:
Xingu I remains undescribed.
Several Xingu pike cichlids were originally known only as:
Some have since received scientific names.
Others have not.
Until Xingu I is formally described:
Xingu I is endemic to:
and specifically the:
in:
Aquarium and field records especially associate Xingu I with the:
around the:
Modern scientific research recognizes Xingu I as one of several distinctive pike cichlid lineages:
It is not a generic Amazon-wide pike cichlid.
Xingu I is highly adapted to:
Natural habitat includes:
Historical field observations found Xingu I specifically in:
Its long, streamlined body allows it to:
Xingu I is not primarily a slow ambush predator.
Its:
make it a:
Xingu I is best described as a:
In the wild, fish make up a major portion of its natural feeding ecology.
There is:
to routinely feed aquarium Xingu I live feeder fish.
Live feeders can introduce:
A well-acclimated Xingu I can often be transitioned onto:
Shrimp and other crustaceans make excellent foods.
Suitable options include:
These provide useful protein and nutritional variety.
Earthworms can be an excellent food for large pike cichlids.
They often trigger a strong natural feeding response and are useful when transitioning wild fish away from live fish prey.
Use worms from:
Appropriately sourced fish pieces may also be offered.
Rotate species and food types rather than relying on one fish product continuously.
Do not maintain Xingu I exclusively on:
A varied carnivorous diet provides better long-term nutrition.
This listing is for:
Some newly imported wild specimens may initially recognize only moving prey.
They can often be transitioned gradually to:
During acclimation:
Once settled, many Xingu I become extremely enthusiastic feeders.
Older aquarium references commonly place Xingu I around:
More recent specialist information covering the Xingu forms reports:
or approximately:
For permanent housing:
rather than designing the aquarium around the smallest adult estimates.
A large male can become:
Young Xingu I may appear manageable.
However, they grow into:
A permanent aquarium plan should already exist before purchase.
The older page recommends:
I would increase that recommendation.
For one mature Xingu I:
with:
for a large adult.
For:
consider:
or a similarly large custom aquarium.
With this species:
A mature Xingu I should ideally have:
because this species is:
A narrow aquarium can contain many gallons while still making it difficult for a long pike cichlid to turn comfortably.
Choose:
rather than simply:
A suitable aquarium should contain:
Do not fill the entire aquarium with décor.
Xingu I needs significant:
for normal movement.
Use décor primarily around the:
while leaving open lanes.
Visual barriers are extremely useful because adults can become:
Use:
to break direct lines of sight.
This can reduce constant aggression between compatible large fish.
Xingu I naturally inhabits rapids.
Provide:
using:
Xingu I prefers warm tropical conditions.
Warm water naturally contains:
than cooler water.
Therefore:
Provide:
to reflect the species' rheophilic natural habitat.
However, create protected locations behind:
where the fish can rest away from maximum current.
A practical long-term range is:
Natural Xingu water around known collecting areas can be:
A stable aquarium pH between approximately:
is appropriate.
Avoid chasing exact numbers at the expense of stability.
A good maintenance range is:
The previous:
range was somewhat cool at the bottom end for this rheophilic Xingu form.
Warmer conditions can be tolerated, but they dramatically increase:
Unless there is a specific husbandry reason, maintaining continuously extreme temperatures is unnecessary.
Large predatory cichlids produce significant waste.
Recommended filtration includes:
Regular partial water changes are important.
Large predatory fish consuming protein-rich diets produce substantial:
Keep nitrate as low as reasonably practical.
Pike cichlids can:
A frightened or excited Xingu I can launch itself from an open aquarium.
Use a:
and cover openings around:
Juvenile Xingu I may initially appear surprisingly:
or relatively tolerant.
Do not assume that behavior will continue into adulthood.
As Xingu I matures, territorial behavior can increase dramatically.
Adults can become:
especially toward:
Any fish small enough to fit into the Xingu I's mouth should be considered:
Because pike cichlids possess:
they can swallow surprisingly large prey.
In a sufficiently large aquarium, potential companions may include selected:
Compatibility is never guaranteed.
Do not keep Xingu I with:
They may eventually be eaten.
Even fish too large to swallow may be inappropriate if they are:
Xingu I is an assertive predator.
If attempting a large predator community:
can sometimes reduce territorial problems.
A mature Xingu I already established in an aquarium may treat later additions as intruders.
Individual temperament varies dramatically.
One fish may coexist successfully with selected large tankmates while another may:
Always have a:
Keeping multiple adult Xingu I is difficult.
Mature fish may show severe aggression toward:
unless a compatible pair has formed.
If breeding is attempted, beginning with a group of juveniles allows fish to:
However, once a pair forms:
Sexual differences become much more obvious with maturity.
Generally:
Generally:
A mature breeding female can develop:
contrasting dramatically against a darker:
This is one of the most spectacular features of the species.
Xingu I breeding should not be advertised as:
Older aquarium reports document:
but successful reproduction with surviving fry has not been reliably established in normal home aquariums.
Based on observations of Xingu I and related Lugubria, spawning takes place in:
Eggs are attached to surfaces within the spawning site.
There are historical aquarium reports of Xingu I:
but those reported clutches:
Therefore, avoid claiming established captive propagation.
Like other large pike cichlids, parental care is:
During spawning:
primarily:
primarily:
Field observations have documented females of Xingu I leading:
through strong current.
This demonstrates strong parental investment in nature.
If a pair attempts to spawn:
Tankmates that were previously tolerated may suddenly be attacked.
A breeding pair is best managed:
Because several Xingu Lugubria remain scientifically unresolved, preserve:
Avoid intentionally breeding Xingu I with:
and later marketing offspring as pure Xingu I.
Because Xingu I remains:
it does not currently have its own formal species-level IUCN Red List assessment.
Therefore:
is the most accurate wording.
The Rio Xingu has experienced major environmental changes associated with:
An undescribed species can face conservation concerns even without its own IUCN assessment.
The Xingu I combines:
into one of the most impressive South American pike cichlids available to experienced aquarists.
Before purchasing a Xingu I Pike Cichlid:
The modern aquarium identification is:
Classification:
Former classification:
Native locality:
For this product, use:
Xingu I remains a scientifically undescribed pike cichlid.
Older literature refers to this fish as:
Modern pike-cichlid classification places it in:
Because similar undescribed Xingu pike cichlids exist, preserve:
Do not substitute another named Lugubria species based only on appearance.
Live fish are professionally packed for safe transport.
Shipping availability depends on:
The current large Xingu I Pike Cichlid requires:
Large specimens may require:
Please review our Shipping & Payment Information and Live Arrival Guarantee / DOA Policy before ordering.
Customers are responsible for confirming that Lugubria sp. ‘Xingu I’ may legally be purchased, possessed, transported, and received in their state or local jurisdiction before ordering.



















