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Species profile

Sailfin Tetra

Crenuchus spilurus

Common names: Sailfin Tetra, Sailfin Characin

Recognized speciesTetras
Sailfin Tetra (Crenuchus spilurus)

Adult size

Up to 7 cm

Up to 7 cm

Countries of origin

  • See all stock from Brazil
  • See all stock from Colombia
  • See all stock from Ecuador
  • See all stock from French Guiana
  • See all stock from Guyana
  • See all stock from Peru
  • See all stock from Suriname
  • See all stock from Venezuela

Good fit for your tank?

Good fit for

  • A mature, stable aquarium

Think carefully if

  • Your tap water is hard and you do not want to treat it
  • Your tank is newly set up
  • You keep shrimp you want to protect

An unusual, chunky fish with a tall dorsal fin on the male, also called the Sailfin Characin. Keep alone or in a small group in 68 litres or more.

Appearance and Identification

An unusual, chunky fish with a tall dorsal fin on the male, also called the Sailfin Characin. It behaves more like a small cichlid, guarding eggs in a cave, and it is usually kept as a pair.

Check the scientific name when buying, as common names vary between sellers and countries.

Males usually grow larger, with longer fins, but sexing can be hard outside breeding.

Tank Requirements

Suggested filter
About 270–340 litres an hour
Suggested heater
About 75–100 W for this tank
Minimum tank volume
68 litres
Minimum tank length
75 cm
Minimum group size
2
Recommended group size
2
Activity level
Moderate
Flow preference
Low to moderate
Planting preference
Moderately planted
Hiding places
Yes
Lid recommended
Yes
Jumping risk
Moderate

Provide wood, rocks and clear territories, with enough open water for a fish of this size. Strong filtration helps, because cichlids produce a lot of waste.

Behaviour and Tankmates

A characterful fish that interacts with its surroundings and often recognises its keeper.

Often best as a pair, or as a small group in a roomy tank.

Can be territorial, especially when breeding.

Choose tankmates with care, by size and temperament. It may eat much smaller fish, and it can harass peaceful ones when breeding. It is likely to eat shrimp.

Check tankmates for this species

Water Parameters

Temperature
20–28 °C
pH
4–6.5
GH
1–5
Stability importance
Very important

Needs soft, acidic water.

Parameter caveat
Add this fish only to a mature, fully cycled tank, and keep up regular water changes.

Feeding

Diet types
Omnivore
Feeding frequency
Daily
Preferred foods
  • Quality pellets or flakeA good staple. Choose a size that fits its mouth.
  • Frozen bloodworm, daphnia and brine shrimpOffer several times a week for colour and condition.
  • Algae or vegetable-based foodInclude some plant matter for balance.

Takes good-quality pellets, along with frozen foods for variety.

Feed small amounts, and remove anything left after a few minutes.

Breeding

Breeding type
Cave Spawner
Breeding difficulty
Moderate
Parental care
Variable
Baby foods
  • Newly hatched brine shrimpThe fry can usually take this from the start.
  • Crushed flakeA simple addition as they grow.

Spawns inside a cave, and one parent guards the eggs and young. Provide a suitable cave for each pair.

Habitat and Origin

Geographic origin
Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, South America, Suriname, Venezuela
Natural habitat
Freshwater Stream
Aquarium contexts
Planted Aquarium
Audience level
Intermediate

Classification

Profile type
Recognized species
Genus
Crenuchus
Family
Crenuchidae
Species group
Fish, Tetras

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