Occurs in rivers and streams . The type locality, Kalu Ganga, has a gravel-pebble bed with fast-flowing water strewn with boulders . Sympatric with other cyprinids such as Puntius srilankensis, Puntius martenstyni and Labeo fisheri .
Dorsal soft rays (total): 10 - 11; Anal soft rays: 19 - 23; Vertebrae: 35. This species is distinguished from its congeners by the following set of characters: lateral line complete with 33-36 + 1-2 pored scales; scales on transverse line ½ 6/1/2-2 ½ and on caudal peduncle ½ 4/1/1 ½ scales; body depth 27.2-29.8% SL; pelvic-fin length 20.5-25.2 %SL in adults, and longer in juveniles, but not extending beyond origin of anal fin; tuberculation on lower jaw dense, reaching backwards beyond level of anterior orbit . It is distinguished from its Sri Lankan congeners by having a rounded cleithral spot whose greatest dimension is less than the eye diameter; distinct neuromast fields on the lower jaw; unbranched pelvic-fin ray when adpressed usually reaching beyond the anal-fin origin; usually circumpeduncular scales 12-14 and lateral-line scales 33-36; differs from L. varuna in having the round (vs. vertically elongate) cleithral spot . : fusiform / normal; Cross section: compressed.
Behavioural data for Lanka blue laubuka is currently being reviewed.
Diet information for Lanka blue laubuka is currently being compiled.
Reproduction data for Lanka blue laubuka is currently being compiled.
Freshwater; benthopelagic. Tropical
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