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Species profile

Saddleback Loach

Homaloptera orthogoniata

Common names: Saddleback Loach

Recognized speciesLoaches
Saddleback Loach (Homaloptera orthogoniata)

Adult size

Up to 14 cm

Typical adult length 9.8–14 cm.

Up to 14 cm

Countries of origin

  • See all stock from Cambodia
  • See all stock from Indonesia
  • See all stock from Laos
  • See all stock from Malaysia
  • See all stock from Thailand

Good fit for your tank?

Good fit for

  • Keepers able to provide at least a 100 cm aquarium with the substrate, current, and cover this loach needs.
  • A mature high-flow aquarium with oxygen-rich water and established grazing surfaces.

Think carefully if

  • The aquarium is shorter than 100 cm or cannot support the recommended social group.
  • Water is warm, stagnant, or the aquarium lacks mature biofilm-covered stone.

Saddleback Loach is a bottom-dwelling loach requiring a 100 cm or longer aquarium, suitable substrate, stable water, and species-appropriate social housing.

Appearance and Identification

A long, flattened stream loach with a brown body marked by large dark saddle-shaped blotches and broad paired fins.

Requires more floor space than small disc-shaped hillstream loaches.

Mature males may have a squarer head, stronger pectoral-fin rays, or breeding tubercles, while females are usually fuller through the abdomen. These differences are subtle and species identification should come first.

Tank Requirements

Suggested filter
About 560–700 litres an hour
Suggested heater
About 150–200 W for this tank
Minimum tank volume
140 litres
Minimum tank length
100 cm
Minimum group size
3
Recommended group size
5
Activity level
Moderate
Flow preference
High
Planting preference
Moderately planted
Hiding places
Yes
Lid recommended
Yes
Jumping risk
Medium

Provide a broad aquarium at least 100 cm long with strong oxygenation, clean current, smooth cobbles, sand, and shaded crevices. Preserve open floor space because this elongated hillstream loach moves between rocks rather than remaining fixed to one surface.

Behaviour and Tankmates

Saddleback Loach is a bottom-oriented stream fish that rests beneath wood or stone and darts across the substrate to feed. It may guard preferred crevices, especially against similar-shaped loaches.

A small group of 3 to 5 can be attempted in a sufficiently structured aquarium, but each fish needs a separate retreat.

Territorial disputes usually centre on shelters and feeding areas. Use visual barriers and several caves.

Suitable companions are peaceful stream fish that tolerate the same temperature and current. Avoid large aggressive botiids and cramped mixed-bottom communities.

Check tankmates for this species

Water Parameters

Temperature
22–27 °C
pH
5.5–7.5
GH
1–10
KH
0–6
TDS
30–180
Stability importance
Important

Prioritise high dissolved oxygen, cool-to-moderate temperature, strong surface movement, and very low organic waste. Heat reduces the oxygen safety margin.

Parameter caveat
Do not place a newly imported rheophilic loach directly into a warm, low-flow aquarium. Acclimate gradually and confirm that the fish can reach quiet resting pockets as well as current.

Feeding

Diet types
Aufwuchs Grazer, Insectivore, Omnivore
Feeding frequency
Daily
Preferred foods
  • Biofilm and natural aufwuchsMaintain mature stone and wood surfaces so the fish can graze throughout the day.
  • Quality algae or aufwuchs wafersUse a sinking food containing plant material and some animal protein.
  • Small frozen invertebratesOffer occasional Artemia, Daphnia, cyclops, or finely chopped insect larvae.

Eats small invertebrates more than algae. Feed small sinking pellets with frozen daphnia, bloodworm and brine shrimp.

Distribute food across several stones so dominant fish cannot guard one feeding point. Do not rely on algae growth alone.

Breeding

Breeding type
Egg Layer, Egg Scatterer
Breeding difficulty
Difficult
Breeding temperature
24.5 °C
Breeding pH
6.5
Brood or egg count
Usually described as a modest scatter of small eggs; dependable species-specific counts are limited.
Incubation
4 days
Parental care
None
Baby foods
  • Infusoria or cultured microscopic foodUse when newly free-swimming fry are too small for Artemia.
  • MicrowormsIntroduce once fry actively search the bottom.
  • Newly hatched Artemia naupliiUse after fry are large enough to swallow nauplii.

Captive breeding is uncommon but may occur in a mature stream aquarium. Condition adults with abundant natural grazing and small live foods, provide gravel, rock crevices, and quieter pockets, and avoid disturbing any eggs or newly emerged fry. Parental care is not expected.

Habitat and Origin

Geographic origin
Asia, Cambodia, Indonesia, Laos, Malaysia, Southeast Asia, Thailand
Natural habitat
Clearwater, Fast Stream, Rocky Shoreline
Aquarium contexts
Freshwater Aquarium, High-Flow Aquarium, Species-Only Aquarium
Audience level
Specialist

Classification

Profile type
Recognized species
Genus
Homaloptera
Family
Balitoridae
Species group
Fish, Loaches

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