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Gastromyzon unknown04

by Martin Thoene last modified Nov 12, 2006 10:13 PM


Gastromyzon unknown04, undersideScientific Name: Gastromyzon unknown04 (AKA Gastromyzon species SK04)

Common name: Hillstream loach

Synonyms: May possibly be a local variety of Gastromyzon psiloetron, known from East Kalimantan

Distribution: South Kalimantan, Indonesia

Sexual Dimorphism: Females probably plumper all over than males.

Maximum size: 2 inches + (5 cm +)

Similar to: Other Gastromyzon species

Gastromyzon unknown04

Care: Inhabit fast flowing streams over sand, gravel and rocks. Aquarium must duplicate these conditions as fish have very high oxygen requirements.

See: Hillstream Loaches: Specialists at Life in the Fast Lane for more detailed explanation.

With all Gastromyzon species, care is broadly the same. All need excellent water-flow and aeration, numerous rocky hiding places and smooth pebbles and boulders to graze over. Lighting should be bright to encourage algal growth in the aquarium. Plants are not necessary as the fish do not normally encounter them in the wild, but they will help with water-quality. Suitable plants for high-flow environments are Anubias and Microsoreum. These will grow on rockwork or driftwood.

Feeding: Good quality flake, sinking pellets, algae wafers, thawed frozen Bloodworm, Mysis Shrimp, blanched Spinach, Kale, natural algae an advantage.

Water parameters: pH:7.0-8.0 Hardness: Medium Max dh: 12

Temperature: 75.2ºF to 82ºF(24-27.7°C)

Breeding: Not bred in aquaria.


This fish was collected by Hendra Budianto in the wild and designated SK04 for reference purposes.

It is tentatively termed Gastromyzon sp. cf. psiloetron (SK04).

The local name for the fish is “Katetipal” (sometimes they also call “tetipal”), which means (more or less) sticky.

This species can change its color in minutes from pale light brown to deep black in large specimens, meanwhile the small specimens tend to be just light brown color. The adults have more intense yellowish color in the dorsal and caudal fin and light brown top and bottom ray of caudal fin.

Local people inform Hendra that the black suckers can grow quite big and larger than “SK02”, the people also wonder if the black suckers are female, while “SK02” are the males, they think like that because the black (big and mature specimens of “SK04”) always appear to be carrying eggs.

Gastromyzon unknown04, natural stream. Note visibly rapid flowThe habitat was a hill-stream about 8-12 M wide, up to about 80 cm deep.

The water was very clear and the current strong.

Temp. 26 C, pH 7.8, TDS 054 ppm.

Substrate of sand mixed with gravel and rocks.

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