Scientific Name: Gastromyzon scitulus (Tan & Leh, 2006)
Common name: Spiney-headed hillstream loach (because of confusion with G. ctenocephalus)
Synonyms: None.
Distribution: Sarawak, Borneo. Indonesia. Malaysia.
Sexual Dimorphism: Females generally plumper all over than males. Mature males develop raised areas on first few pectoral fin rays, resembling a line of fences, or louvres.
Maximum size: 2 inches
Similar to: Gastromyzon ctenocephalus
Care: Inhabit fast flowing streams over boulders. Aquarium must duplicate these conditions as fish have very high oxygen requirements. See: http://www.loaches.com/hillstream_loaches.html 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:
Temperature: 68ºF to 75ºF(20-23.8°C)
Breeding: Not bred in aquaria.
Caption: Gastromyzon scitulus Male
Credit: Martin Thoene
Caption: Gastromyzon scitulus Male
Credit: Martin Thoene
Caption: Gastromyzon scitulus Female
Credit: Martin Thoene
Caption: Gastromyzon scitulus Male
Credit: Martin Thoene
Caption: Gastromyzon scitulus
Credit: Martin Thoene
Caption: Gastromyzon scitulus
Credit: Martin Thoene
Caption: Gastromyzon scitulus Male
Credit: Martin Thoene
Caption: Gastromyzon scitulus Female
Credit: Martin Thoene
Caption: Gastromyzon scitulus Left FEMALE. Right MALE.
Credit: Martin Thoene
Caption: Gastromyzon scitulus, underside
Credit:
Caption: Gastromyzon scitulus is identifiable from Gastromyzon ctenocephalus by generally having larger yellowish spots along the dorsal area. The dorsal fin lacks the bold pale blue markings of G. ctenocephalus and there are haphazard black vertical breaks in the horizontal pale blue stripes in the caudal fin.
Credit: Martin Thoene

Caption: G. scitulus TOP, G. ctenocephalus BOTTOM
Credit: Martin Thoene