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FishFreshwaterIntermediate

Marble Whiptail

Loricaria simillima

Extraordinary camouflaged Loricariid (25 cm) that spends its time buried. Differs due to pronounced fringed 'lips' used to root around. Male is a lip-brooder.

Taxonomy

Class:Actinopteri

Order:Siluriformes

Family:Loricariidae

Subfamily:Loricariinae

Genus:Loricaria

Species:Loricaria simillima

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Water Temperature

24 - 28 °C

pH Value

6 - 7.5

Water type

Freshwater

Tank level

Bottom

Adult size

25 cm

Minimum tank volume

>= 300 L

Minimum group

>= 1

2 - 15 dGH

1 - 7 dKH

TDS

40 - 295 ppm

Conductivity

63 - 461 uS/cm

Species description

Geographical Origin and Habitat: Species with a vast range in South America (Orinoco, Amazon, Paraná basin). Prefers sandy or muddy bottoms in slow river stretches, stream banks, and open lagoons, where it buries itself almost completely to hide.

Taxonomy and Morphology: Loricariinae subfamily. Elongated and flattened shape, reaches 25 cm (10 inches). The key feature is the mouthparts: the lips are expanded and equipped with countless long fleshy tentacles (fringes), evolved to detect food by sifting sand. The tail has a very long upper filament.

Social Behavior: Peaceful and indolent. Spends the day camouflaged or buried in the sand leaving only the eyes out. At night it comes out and patrols the bottom in search of debris. Harmless to fish and plants, gregarious with its own kind.

Coloration and Sexual Dimorphism: Exceptional camouflage: beige, sand, or light brown with large dark spots and marbling. Dimorphism evident in breeding: males have hyper-developed lower lips (to carry eggs) and a broader, more hirsute snout.

Care, breeding and tankmates

Aquarium Setup: Essential 120 cm (48 inches) tank with FINE SAND BOTTOM. Sharp gravel or stones ruin their lips and belly. Leave wide open spaces without plants on the bottom to allow burying. Branched wood and oak leaves on the bottom.

Diet and Feeding: Detritivore micro-predator. In nature, it sifts mud for worms and crustaceans. In the aquarium offer frozen bloodworms, tubifex, mixed bottom tablets. It DOES NOT feed solely on algae on the glass.

Water Quality: Very adaptable: tolerates pH 6.0-7.5 and hardness up to 15 GH. Ideal temperatures 24-28°C (75-82°F). Requires a clean bottom (siphon regularly) to avoid bacterial infections of the barbels.

Compatibility and Cohabitation: Excellent with Characins (Tetras), Corydoras, Apistogramma. Not to be combined with large territorial Loricariids, aggressive Cichlids, or highly ravenous fish that would consume all bottom food.

Aquarium Breeding: Very rare species due to its behavior: it is a lip-brooder. The female lays a cluster of adhesive eggs. The male collects them and glues them to his enlarged lower lip, carrying and fanning them continuously for 10-15 days until hatching. The young need immediate micro-food.

Risks and Diseases: Starvation and atrophy in tanks with fast fish. Risk of fungal infections if barbels are scratched on rough gravel or dirty, anoxic bottoms.

Geographic Origin and Distribution

Species with a vast range in South America (Orinoco, Amazon, Paraná basin). Prefers sandy or muddy bottoms in slow river stretches, stream banks, and open lagoons, where it buries itself almost completely to hide.

Origin

Tropical oceans and reefsAmazon, Orinoco, and Guianas

Fish profile

Temperament: Semi-aggressive
Diet: Omnivore
Sex ratio: Group
Feeding frequency: Twice daily
Bioload: Loricaria simillima generates a very low bioload. They are inactive and produce little waste. Normal filtration is entirely adequate.
Flow: Stagnant
Reproduction: Oviparous
Compatibility & tankmates: They are completely peaceful and harmless. Keep them with small, calm tank mates. Aggressive bottom dwellers will outcompete them.
Tank level: Bottom

FishBase

Window to the official scientific data of the species

Data synced on: 06/15/2026

Scientific Parameters & Models

Trophic level: 2.4 ± 0.2 se
Resilience: Medium (1.4 - 4.4 years)
Phylogenetic uniqueness (PD50): 0.5
Bayesian Length-Weight: a = 0.00398, b = 3.11

Image gallery

Licensed images linked to the species or, when marked, to the closest representative taxon.

Related species

Recommendations grouped by close relatives, companion choices, and similar care.

Variants and close relatives

Same atlas type, nearby scientific identity, genus, or family.

Royal Pleco (L190)

Panaque nigrolineatus

Species description

Care, breeding and tankmates

Geographic Origin and Distribution

Origin

Fish profile

Scientific Parameters & Models

Image gallery

Related species

Variants and close relatives

Royal Pleco (L190)

Vampire Pleco (L029)

Red Lizard Catfish (L010a)

Orinoco Twig Catfish

Gold Marble Bristlenose (LDA08)

Tentacle Lasiancistrus

Adonis Pleco

Hi-Fin Green Phantom Pleco (L200)

Albino Bristlenose Pleco

Guahibo Pleco

Bristlenose Pleco (Ancistrus)

Snowball Pleco (L026)

Snowball Pleco (L142/LDA033)

Pitbull pleco

Sultan Pleco (L264)

Twig Catfish

Recommended companions

Ammannia sp. 'Bonsai'

Bacopa sp. "Japan"

Bolbitis heteroclita

Arrowhead Anubias

Bucephalandra motleyana "Braun-rot narrow"

Bucephalandra motleyana "Riam Macam"

Anubias

Anubias nana

Bucephalandra motleyana "Braun-rot" ("Serimbu")

Bucephalandra motleyana "Kapit"

Bucephalandra motleyana "Pancuraji"

Bucephalandra sp. "Bukit Kelam / Sintang"

Bucephalandra sp. "Melawi"

Anubias barteri var. nana 'Round Leaf'

Anubias congensis

Anubias gigantea

Similar care

Para Pleco (L075)

Big Spot Pleco (L075)

Lamontichthys

Ghost Pleco (L141/L215)

Giant-eye Otocinclus

Leopard Frog Pleco (L134)

Green Phantom Pleco

Three Beacon Pleco (L091)

King Tiger Pleco (L066)

Bristlemouth Pleco

Meandrinus Pleco

Contradens Pleco

Candy Stripe Pleco (L015)

Clown Pleco (L104/L162)

Butterfly Pleco

Snowball Pleco