Classificatie / Names
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Anabantiformes (Gouramies, snakeheads) >
Nandidae (Asian leaffishes)
Etymology: Nandus: 'Nandus' is a Bengali local name, but it lacks a proper reference; ‘nanda’ is a Bengali fish name but probably for a different species (J. Müller, pers. comm., April 2021, after information from native speakers); mercatus: The specific epithet comes from the Latin noun mercatus, meaning a trading place or market. The name is used in reference to the method with which the holotype was obtained (purchased from a market), and honors the fish market, a valuable tool to i.
Environment: milieu / climate zone / depth range / distribution range
Ecologie
; zoet water pelagisch; pH range: 4.3 - ?. Tropical; 3°N - 2°N, 103°E - 104°E
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).
Grootte / Gewicht / Leeftijd
Maturity: Lm ? range ? - ? cm
Max length : 7.0 cm SL mannelijk / geslacht onbekend; (Ref. 79863)
Korte beschrijving
Determinatiesleutels | Morfologie | Morfometrie
Dorsale stekels (totaal) : 14; Dorsale zachte stralen (totaal) : 10; Anale stekels: 3; Anale zachte stralen: 5 - 6; Wervels: 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.
Levenscyclus en paargedrag
Maturities | Voortplanting | Spawnings | Egg(s) | Fecundities | Larven
Ng, H.H., 2008. Nandus mercatus (Teleostei: Perciformes: Nandidae), a new leaf fish from Sumatra. Zootaxa 1963:43-53. (Ref. 79863)
Status op de Rode Lijst van het IUCN (Ref. 130435)
Gevaar voor de mens
Harmless
Gebruik door de mens
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Estimates based on models
Fylogenetische diversiteitsindex (Ref.
82804): PD
50 = 0.5098 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01148 (0.00489 - 0.02694), b=3.06 (2.85 - 3.27), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Trofisch niveau (Ref.
69278): 3.3 ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
