Not furry, but we like them anyway.

Whiptail Catfish

Rineloricaria spp. Bleeker, 1862

Also called Mailed catfish, Lizard catfish (red form)

SpeciesShort profile

From Southern Central America and much of South America, from Costa Rica to Argentina on both sides of the Andes.1

At a glance the quick version

Length9.5 to 13 cm1 2 3

Sizesmall

Genus average about 13 cm (Wikipedia); R. lanceolata reaches 9.5 cm SL and the red form 11 cm (Seriously Fish).

Very peaceful

Devoted fathers that guard their eggs

Slender, unusual shape

2 1

Looks how to spot one

Bony-plated suckermouth catfish

Long and slim with an armour of bony plates, a narrow face, an upright dorsal fin and an extremely thin tail stalk that ends in a whip-like tail. It has a sucker-style mouth and no visible barbels. Males grow extra bristles on the head and fins.1

ColoursLight brown with darker bandsDark dorsal finRed (red lizard form)1 3

Personality what they are like

Counted among the most peaceful catfish in the hobby. It is shy with pushy tankmates and calmly rests on sand or wood.2 3

Daily activity how busy a day looks

A slow, mostly sedentary bottom dweller that browses over sand, wood and plants.2 1

Grooming and care the hands-on bits

Seriously Fish lists 25-28 C, pH 6.0-8.0 and 5-20 dGH for R. lanceolata, and 24-29 C, pH 6.0-7.5 and 2-15 dGH for the red form. Provide sandy or fine substrate and caves or tubes, and make sure sinking food reaches it before faster fish take it.2 3

Home where they are happiest

Lives in rivers, streams and lagoons over sand or rock and is adaptable to a wide range of temperatures. A pair can live in about 45 cm of tank; a small group needs about 75 x 30 x 30 cm.1 2 3

Food basics what goes in the bowl

Eats biofilm and small crustaceans in the wild; in aquariums it takes sinking dried foods, vegetables such as spinach and courgette, and frozen or live bloodworm and daphnia.2 3

Company who they like around

Happy in pairs or small groups, sharing well with small characins, dwarf cichlids and corydoras.2 3

The story where it all began

Dutch ichthyologist Pieter Bleeker set up the genus in 1862, with Loricaria lima as its type species. New species are still being described, and the genus now holds more than 100.1

Fun facts for the dinner table

1
Males clean out a cave, and after the female lays, the male alone guards and fans the eggs until they hatch in about 4-5 days.2
2
The eggs, often more than 100, are laid stuck together in a single layer on the cave floor.1
3
Species in this genus show a remarkable range of chromosome numbers, from 36 to 70.1
4
The red lizard catfish's exact origin is unclear: it may be a wild form, a selectively bred line or a hybrid.3

Recognised by the official bits

Taxonomy: Genus Rineloricaria, family Loricariidae, established by Pieter Bleeker in 1862; over 100 species1
DATZ L-number: Red lizard catfish form traded as L010a3

The care rhythm a typical week and year

A typical home-care rhythm for a Whiptail Catfish. A starting point, not a vet's advice.

FeedingSmall amounts once or twice a dayevery day
Temperature checkevery day
Water changeAbout 25% of the waterevery week
Water testevery week
Glass cleanevery week
Filter rinseRinse in old tank water, never tap waterevery month

Owner questions the things everyone asks

How often should I feed my Whiptail Catfish?

Furry Diary's starting plan is to feed small amounts once or twice a day. This gentle bottom dweller browses slowly, so make sure sinking food reaches it before faster fish take it. Pet Wiki plan

What does a Whiptail Catfish eat, and what should it never eat?

It enjoys sinking dried foods, vegetables like spinach and courgette, and frozen or live bloodworm and daphnia. For foods to avoid, it's best to ask a vet or good breeder as this varies.2 3

How much space does a Whiptail Catfish need?

A pair can live in a tank about 45 cm long, while a small group needs at least 75 x 30 x 30 cm. Provide sandy substrate and caves or tubes for this shy fish.1 2 3

What temperature, light or water does a Whiptail Catfish need?

For R. lanceolata aim for 25-28°C, pH 6.0-8.0 and 5-20 dGH; for the red form 24-29°C, pH 6.0-7.5 and 2-15 dGH. Light needs are not specified, but a calm environment with hiding spots is ideal.2 3

How often should I clean a Whiptail Catfish's home?

Furry Diary's starting plan suggests weekly 25% water changes and glass cleaning, plus a monthly filter rinse in old tank water. This keeps the water quality stable for your peaceful catfish. Pet Wiki plan

Can a Whiptail Catfish live with others?

Yes, it is very peaceful and does well in pairs or small groups. Good tankmates include small characins, dwarf cichlids and corydoras.2 3

How long does a Whiptail Catfish live?

Lifespan information is not provided in our sources. For accurate details, please ask a good breeder or an exotic-pet vet.

Can I handle a Whiptail Catfish?

Handling is not covered in our care guide. As a shy, delicate fish, it's best to avoid handling and consult a vet or breeder for specific advice.

Written from the sources on this page, a few checked guides (VCA, ASPCA, RSPCA) and Pet Wiki's own starting care plan. A friendly guide, not a vet's advice.

Twig Catfish

Otocinclus

Where this comes from

Every fact on this page has a numbered source. Spotted an error? [email protected].

Wikipedia: Rineloricaria en.wikipedia.orgused for distribution, description, size, breeding, taxonomy, history
Seriously Fish: Rineloricaria lanceolata seriouslyfish.comused for water parameters, tank size, diet, temperament, breeding
Seriously Fish: Rineloricaria sp. (red lizard, L010a) seriouslyfish.comused for red form, water parameters, diet, size

Checked 2026-09-30. Text is written in our own words from these sources.