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Cypriniformes: Balitoridae
Gastromyzon aeroides Tan & Zohrah, 2006
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Gastromyzon aeroides Tan & Zohrah, 2006
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original designation
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Dusun (local lang.)
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Rokot, Rogot, Kirokot
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‘Gastromyzon’ is derived from Greek and means bellysucker; ‘gaster’ means belly, ‘myzo’ means to suck; gender: masculine.
The specific epithet ‘aeroides’ derived from Latin and means skyblue; a noun; an allusion to its skyblue colored unpaired fins.
Figure 1. Gastromyzon aeroides; mature fish, dorsolateral view, caught 2009-06-07, not preserved, EW-MAL 17-09, Kimanis River, W Sabah, Borneo, Malaysia.
Holotype has 38.8 mm SL; largest reported specimen 45.9 mm SL (lot ZRC 47022; 7 ex.); paratype (Tan, 2006).
Subopercular groove present but shallow; body and dorsum uniform brown, head with cream reticulate pattern; unpaired fins light blue when alive; head rounded when viewed from above; 47-65 lateral line scales (Sabah population: 56-65, Brunei population: 47-49), caudal peduncle deep (9.5-11.2% SL) and short (6.8-9.6% SL) (Tan, 2006).
Easily distinguished from G. punctulatus Inger & Chin, 1961 by its blue unpaired fins and deeper caudal peduncle.
G. aeroides, G. punctulatus and G. katibasensis Leh & Chai, 2003 are comprised in the G. punctulatus group.
Type locality is the Sungai Malamum, 50 m asl, N 04º 59.120', E115º 37.581', Mengalong River basin, Sipitang county, SW Sabah, Borneo, Malaysia.
Inhabiting clear, well oxygenated, moderate to fast running streams over rock and boulder substratum; Padas River, Kimanis River and Petagas River basins; along the west and east face of the Crocker Range, Sabah, Borneo, Malaysia; Temburong River basin, Brunei (Tan, 2006; ME, pers. obs., June 2009).
Singly; immobile; territorial; hierarchical fights for best feeding places; benthic; lithophilic; in EW-MAL 17-09 Kimanis River, Sabah, Borneo, Malaysia, syntopic with two balitorids, viz. G. extrorsus Tan, 2006 and Glaniopsis sp.
Clinging to the rock substratum grazing algae and oportunistically aquatic insect larvae; grazing preferably on vertical smooth rock surfaces. Grazing area had an radius of min. 30 cm.
A biotope is the Kimanis River (EW-MAL 01-09, 17-09); a high gradient stream running over boulder and rock substratum, ca. 15 m broad and 1.5 m deep, riffle section 0.3 m deep; 90 m asl, N 05º 32.223', E115º 59.572'; 26.5 ºC, 7.6 pH, 140 µS/cm, 70 mg/l (ppm; TDS) on 2009-06-02, 10:30; 28 ºC, 8.1 pH, 60 µS/cm, 30 mg/l (ppm; TDS) on 2009-06-07, 15:00 (ME, pers. obs., June 2009).
IUCN Red List not evaluated.
no reports on aquarium maintenance available.
G. aeroides is eyecatching for its coloration of the unpaired fins.
Figure 2. Gastromyzon aeroides; mature fish, head, ventral view, caught 2009-06-07, not preserved, EW-MAL 17-09, Kimanis River, W Sabah, Borneo, Malaysia.
Figure 3. Gastromyzon aeroides; mature fish, dorsal, lateral view, caught 2009-06-07, not preserved, EW-MAL 17-09, Kimanis River, W Sabah, Borneo, Malaysia.
Figure 5. Gastromyzon aeroides; mature fish, ventral view, caught 2009-06-07, not preserved, EW-MAL 17-09, Kimanis River, W Sabah, Borneo, Malaysia.
Figure 4. Biotope of Gastromyzon aeroides; 2009-06-02; EW-MAL 01-09, Kimanis River, W Sabah, Borneo, Malaysia.
You can see more related photographs at the photo section
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