Plec catfish

Squaliforma emarginata

Photo of aquarium fish Plec catfish
Natural range
  • Amazon Basin
  • Brazil area
  • Ecuador area
  • Peru area
CatfishConservation status: Least concern LC

Family:Armored Catfishes (Loricariidae)

Other scientific names: Aphanotorulus emarginatus, Hypostomus emarginatus

Squaliforma emarginata, or Pleco catfish, belongs to the family Loricariidae. Interestingly, this common name often encompasses several closely related species that have been assigned different numbers in scientific classification, such as L035, L116, L153, L166, L108, L195, and others. These fish look almost identical and prefer similar living conditions, despite originating from different geographical areas. In aquaristics, these catfish are particularly valued for their peaceful nature and unpretentiousness, making them an excellent choice for spacious freshwater aquariums.

Required aquarium volume
250 L
Size in aquarium
40 cm
Temperature
25 – 28 °C
Temperament
Peaceful (regular)
Parameters
Temperature25 – 28 °C
Water pHSlightly acidic (6.4) – Neutral (7.2)
Water dHSoft (5) – Medium hardness (10)
Water salinityno salt (freshwater)
Size in aquarium40 cm
Lifespan10 years
TemperamentPeaceful (regular)
Toward small fishnot a predator
Required aquarium volume250 L
Lightingdimmed or moderate
Substratesoft silted
Water flowweak or moderate
FeedingSinking (any)
CareBoth solitary and in group (flexible)

Frequently asked questions

The essentials: size, tank volume, water parameters and care

How big does Plec catfish get?

An adult reaches 40 cm in length. Plan the tank around the maximum size: the fish quickly outgrows a cramped setup.

What size aquarium does Plec catfish need?

The minimum recommended volume is 250 L. A smaller tank speeds up nitrate build-up and raises stress levels.

What water parameters does Plec catfish need?

Temperature 25–28 °C, pH 6.4–7.2, hardness 5–10 dGH. Stability matters more than exact values: sudden swings are harder on the fish than a small deviation from the ideal.

How long does Plec catfish live?

Around 10 years when kept properly. Lifespan depends directly on tank volume, water quality and a varied diet.

Is Plec catfish aggressive?

Temperament: peaceful (regular). Keep this in mind when choosing tank mates.

How many Plec catfish should be kept together?

Recommended setup: both solitary and in group (flexible). Ignoring this is a common cause of stress and disease.

What does Plec catfish eat?

Diet type: sinking (any). Feed small portions that are finished within a couple of minutes — overfeeding does more harm than underfeeding.

What is the scientific name of Plec catfish?

The scientific name of the species is Squaliforma emarginata, family Armored Catfishes (Loricariidae). It also appears in the literature as: Aphanotorulus emarginatus, Hypostomus emarginatus.

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