| Family: |
Nandidae (Asian leaffishes) |
| Max. size: |
7 cm SL (male/unsexed) |
| Environment: |
pelagic; freshwater; pH range: 4.3 |
| Distribution: |
South East Asia: Indonesia, Sumatra. Currently only known from the Musi River in the vicinity of Sekayu (2°51'S 103°51'E) in southern Sumatra (Ref. 79863). |
| Diagnosis: |
Dorsal spines (total): 14; Dorsal soft rays (total): 10; Anal spines: 3; Anal soft rays: 5-6; Vertebrae: 22. No unique diagnostic character was found for this species, with a combination of the following
characters diagnosing it from all congeners: body depth 43.0–43.2% SL, 15 pectoral-fin rays, 29–32 lateral line scales, 11–12 scale rows below the lateral line, and slightly concave predorsal profile. Among Sundaic Southeast Asian congeners, Nandus mercatus is distinguished from N. nebulosus in having a slightly concave
(vs. even or slightly convex) predorsal profile, rostral fossa reaching to almost half (vs. more than half) predorsal distance and fewer pectoral fin rays (15 vs. 17–19), and from N. prolixus in having fewer lateral-line
scales (29–32 vs. 33–37) and deeper body (43.0–43.2% SL vs. 37.6–40.5). It differs from South Asian congeners N. andrewi and N. nandus in having fewer lateral line scales (29–32 vs. 42–55), fewer scale rows below the lateral line (11–12 vs. 14–18), and deeper body (43.0–43.2% SL vs. 24.3–37.1). Nandus mercatus is distinguished from N. oxyrhynchus in having fewer lateral-line scales (29–32 vs. 37–42) and a more gently-sloping
predorsal profile. |
| Biology: |
|
| IUCN Red List Status: |
Data deficient (DD); Date assessed: 01 September 2018 Ref. (130435)
|
| Threat to humans: |
harmless |
| Country info: |
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