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Betta macrostoma Regan, 1910 Spotfin betta |
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photo by
Hasselgreen Jr., P.C. |
| Family: | Osphronemidae (Gouramies), subfamily: Macropodusinae | |||
| Max. size: | 6.7 cm SL (male/unsexed) | |||
| Environment: | benthopelagic; freshwater; pH range: 4.4 - 5.7; dH range: 10 | |||
| Distribution: | Asia: Borneo. | |||
| Diagnosis: | Dorsal spines (total): 0-1; Dorsal soft rays (total): 9-11; Anal spines: 0-1; Anal soft rays: 24-27; Vertebrae: 31-32. Differs from other member of the Betta unimaculata group by possessing the following combination of characters: dorsal fin ocellus; body red in color; caudal fin with transverse black and red bands; opercle with large red blotch in mature male; vertebrae 31-32 (mode 32); dorsal-fin rays 9-11 (mode 10); anal-fin rays 25-28 (mode 27); pectoral-fin rays 13-14; lateral scales 32-33 (mode 33); subdorsal scales 6-8 (mode 7); predorsal scales 21-24 (mode 23); predorsal length 62.3-66.7% SL; head length 30.4-33.3% SL; anal-fin base length 43.2-49.2% SL; dorsal-fin base length 12.2-15.7% SL; lower jaw length 38.0-54.0% HL (Ref. 56613). | |||
| Biology: | Inhabits shallow (about 30 cm deep) near stagnant pools along stream bed with substrate consisting of clay (Ref. 56613). Occurs also in waterfalls with fast flowing clear water; occupies small pools in tributaries and quiet pools along the main confluence of the river (Ref. 56613). A mouth brooder (Ref. 56613). | |||
| IUCN Red List Status: | Vulnerable (VU); Date assessed: 28 December 2018 (B1ab(iii,v)) Ref. (130435) | |||
| Threat to humans: | harmless | |||
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