Jaguar Pleco (Hypostomus sp. 'Jaguar')

Choose a Jaguar Pleco for bold spots in a river-style tank

The Jaguar Pleco is a spotted Hypostomus suckermouth catfish with large, dark, rounded spots scattered evenly over a pale sandy body, head and fins. It arrives labelled Hypostomus sp. "Jaguar", and the trade name points to Hypostomus jaguar, a species described in 2013 by Zanata, Sardeiro and Zawadzki and listed as the Jaguar Pleco by Planet Catfish. FishBase explains the name: it comes from îagûara, the Tupi-Guarani word for panther, chosen for the black dots on a clear background. Hypostomus itself means "mouth underneath", for the sucker mouth these fish use to cling to rocks and wood.

The species is known from the Rio Paraguaçu basin in Bahia State, eastern Brazil. Its type locality is the Paraguaçu at Fazenda Os Touros, 18 km from Iaçu, at 143 metres above sea level. FishBase, summarising the original description, says it lives in the Paraguaçu and its tributaries in stretches up to 60 m wide and 1.5 m deep, over rocky bottoms, in dark-coloured water with a mild to fast current, at altitudes of 143–350 m. FishBase lists it as Least Concern on the IUCN Red List (assessed 2018).

Because we cannot confirm the exact collection locality of each imported fish, we keep the trade label on this listing and give the published facts for H. jaguar. Very little has been written about keeping it, and we say so wherever the advice below comes from general Hypostomus or catfish guidance rather than from studies of this species.

Tell the Jaguar Pleco from look-alikes

The 2013 description separates H. jaguar from its relatives by colour pattern and fin counts, as summarised by FishBase:

Do not confuse it with the similarly named Jaguaribe pleco, a different fish named after the Rio Jaguaribe.

Select one fish and plan its territory

One purchase supplies one live Jaguar Pleco in the standard size we receive. Sex is not specified, and no way to sex this species is published. Spot size and spacing vary between individuals, so the gallery images show the type of fish, not the individual you will receive. The images are prepared from a reference photograph.

Decide how many to keep

• One fish: the safest plan, with one main cave and plenty of wood and rock.
• Two or more plecos: only in a large tank with a separate cave and feeding spot for each, because Hypostomus are often territorial towards other large bottom fish.
• Long life: plecos of this size live for many years, so plan for the adult before you buy.

Read our delivery and Live Arrival Guarantee policy before you order, and have the aquarium running and tested before the fish arrives.

Plan the aquarium around the adult size

The largest fish measured for the 2013 description was 17.6 cm standard length, which is measured without the tail fin. Some sellers quote 25–35 cm; we have found no published source for that, but a wild sample of a few fish may not show the full adult size either. Plan for a fish of at least 18 cm standard length, more with the tail, and leave room for it to grow larger.

No care profile publishes a minimum tank for this species. For comparison, Seriously Fish gives a 120 cm length for a 200 mm Hypostomus and a 120 × 45 cm base for some 230–250 mm species. We recommend at least 120 × 45 cm for one Jaguar Pleco, and a longer tank if you keep it with other bottom fish.

Use a three-step space check

1. Measure the base: at least 120 cm long and 45 cm front to back.
2. Work out the volume with our tank volume calculator, so the filter can turn it over several times an hour.
3. Count caves and feeding spots: one each per bottom-dwelling fish, plus a spare.

Build a rocky river bed with wood and caves

Its wild home is a rocky river with a mild to fast current, so a river-style layout is the most natural choice: smooth, rounded rocks and pebbles over sand, a few pieces of heavy wood, and caves among the rocks. OATA advises soft substrates for catfish, and wood or caves for shelter.

Divide the footprint by function

Fix every rock securely so a strong pleco cannot undermine it, and keep plants tough or attached to wood.

Set water values in the safe middle range

No water values have been published for this species. The wild habitat is described as dark-coloured, flowing river water in a tropical climate. Until better data exist, we use OATA's general guidance for catfish and aim for the middle of it, where most Hypostomus are comfortable.

Match UK tap water to the range

Most UK tap water falls inside this broad range once treated with a conditioner, which makes the Jaguar Pleco easier to house than soft-water specialists. Test your tap water and compare it with our water matcher, keep the temperature steady with a correctly sized heater, and make any change slowly. Steady, clean, well-oxygenated water matters more for this river fish than a precise pH.

Keep the water moving, clean and full of oxygen

River plecos produce plenty of waste and need oxygen-rich water. Choose a filter rated well above your tank volume, add a powerhead or spray bar to create a current along the length of the tank, and keep the surface moving. FishBase notes that Hypostomus can breathe air when they need to, but a fish that keeps gulping at the surface is telling you the water needs attention. New tanks must be fully cycled first; our guide to the nitrogen cycle explains how.

Follow a weekly maintenance sequence

1. Test ammonia, nitrite, nitrate and pH every week, as OATA recommends.
2. Change about 25% of the water, siphoning waste from between the rocks.
3. Remove uneaten vegetables within a day.
4. Clean sponges in removed tank water and check the pump outlets are clear.
5. Refill with conditioned water at the tank temperature.

Feed a grazing diet in measured portions

No diet study has been published for H. jaguar. In aquariums, spotted Hypostomus are fed as grazing omnivores, and OATA's guidance for algae-eating fish applies: they always need prepared foods such as algae wafers alongside any algae they find, plus fresh vegetables, washed well or bought organic to avoid pesticide residues.

Build one measured meal

Feed after the lights dim, near its shelter, and adjust the amount so very little is left after a few hours.

Introduce it to a mature, cycled tank

OATA advises adding fish only when ammonia and nitrite read zero, and adding them gradually so the filter bacteria can cope. Catfish travel double-bagged because their spines can puncture a single bag. Turn off the tank lights, float the bag for about 10 minutes, then add small amounts of tank water over up to 20 minutes before releasing the fish with as little bag water as possible. Our guide to acclimatising new fish shows each step.

Use a first-week checkpoint plan

Handle it carefully: OATA warns that most catfish have spines on the pectoral fins and behind the gills, and plecos tangle easily in nets. Move it in a container where possible.

Watch its behaviour and act on changes

A settled Jaguar Pleco rests in its cave or on the rocks by day and grazes actively in the evening. OATA lists clamped fins, flicking against décor, shimmying and fast breathing as warning signs in any fish.

Pair each observation with an action

Our pleco care guide and common pleco guide cover routine care for larger Hypostomus.

Choose robust community tank mates

No behaviour notes have been published for this species. Seriously Fish's genus notes describe other Hypostomus as peaceful with most tank mates but territorial towards similar-sized bottom fish, especially their own kind, and that is the safe assumption here. Good companions are robust, peaceful fish that use the middle and upper water and enjoy a current.

Decide from the suits and avoid list

From our range, an active barb such as the Denison Barb suits a flowing river tank; check its own water needs overlap first. For related plecos, compare the Common Pleco (Hypostomus plecostomus), the Gold Suckermouth Catfish, the long-finned Leopard Sailfin Pleco and the Gold Spot Pleco L001. Browse our Hypostomus plecos, all South American catfish, our bottom-dwelling fish and the full catfish and plecos range, and check any mix with our tank mates tool.

Know what is and is not published about breeding

Planet Catfish holds no breeding reports for H. jaguar, and no aquarium spawning has been published. No differences between males and females have been described either. Large Hypostomus generally need a very large tank and suitable caves or burrows to spawn, so buy this fish for its striking pattern rather than with breeding in mind.

Answer Jaguar Pleco buying questions

What is a Jaguar Pleco?

Jaguar Pleco is the trade name of a spotted Hypostomus suckermouth catfish with large dark dots on a pale sandy background. Planet Catfish uses the name for Hypostomus jaguar, described in 2013 from the Rio Paraguaçu basin in Bahia, Brazil.

Is it the same fish as Hypostomus jaguar?

Almost certainly; the pattern matches the published description of that species. It arrives labelled Hypostomus sp. "Jaguar", and we cannot confirm where each fish was collected, so we keep the trade label and give the published facts for H. jaguar.

How big does a Jaguar Pleco grow?

The largest fish measured for the 2013 description was 17.6 cm standard length, which is without the tail. Some sellers quote 25–35 cm, but we have found no published source for that, so plan for at least 18 cm plus the tail and allow room to grow.

What size aquarium does it need?

At least a 120 × 45 cm base. Seriously Fish gives that base, or a 120 cm length, for other Hypostomus of 20–25 cm standard length; go bigger if your fish grows beyond the published size.

What water does it need?

No species-specific values are published. In the wild it lives over rocks in dark-coloured, flowing river water. Use the OATA catfish guide range of 22–27°C and pH 6.0–8.0, aim for the middle, and keep the water clean, well oxygenated and moving.

What does it eat?

Feed it like other grazing Hypostomus: sinking algae wafers and pleco tablets, washed vegetables such as courgette, and occasional frozen foods. OATA notes that algae eaters always need prepared foods as well as algae.

Can it live with other plecos?

With care. No behaviour notes exist for this species, but Hypostomus are commonly territorial towards other large bottom-dwellers. Give each pleco its own cave and plenty of floor space, or keep just one.

How do I tell it from similar spotted plecos?

Hypostomus jaguar has large dark dots of similar size on the head and body, up to about one eye-width across, and a short dorsal fin with seven rays. The H. chrysostiktos that lives alongside it has small yellow dots on a dark body and a dorsal fin with 10–11 rays, and sailfin plecos also have a long, many-rayed dorsal fin.

Consult the care references

• Planet Catfish: Hypostomus jaguar: scientific name, authors, the common name Jaguar Pleco, type locality and range.
• FishBase: Hypostomus jaguar: etymology, maximum length, fin counts, identification from relatives, wild habitat and IUCN status.
• Seriously Fish: genus Hypostomus: aquarium bases published for Hypostomus of similar length, used only as a comparison.
• OATA: How to look after freshwater catfish: UK guidance for catfish on water quality, sand, handling spines, bagging, acclimatising and weekly maintenance.
• OATA: How to look after tropical algae eaters: UK guidance on grazing fish needing prepared foods and washed vegetables.
• Tropical Fish Co delivery policy: current dispatch days and Live Arrival Guarantee terms.