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Characiformes (Characins) >
Distichodontidae (Distichodus)
Etymology: Nannocharax: Latin, nannus = small + Greek, charax = a marine fish without identification (Ref. 45335); hadros: The specific name is derived from the Greek adjective 'hadros', meaning well-developed, strong, great, bulky and refers to its large maximum size, exceeding that of its currently known congeners (Ref. 127100).
Environment: milieu / climate zone / depth range / distribution range
Ecologie
; zoet water benthopelagisch; pH range: 7.0 - 8.4; diepte 1 - 1 m (Ref. 127100). Tropical; 18°C - 28°C (Ref. 127100)
Africa: Kalule Nord River, Upper Lualaba, Congo River basin in Democratic Republic of the Congo (Ref. 127100).
Grootte / Gewicht / Leeftijd
Maturity: Lm ? range ? - ? cm
Max length : 7.8 cm SL mannelijk / geslacht onbekend; (Ref. 127100)
Korte beschrijving
Morfologie | Morfometrie
Dorsale stekels (totaal): 0; Dorsale zachte stralen (totaal): 13-14; Anale stekels 0; Anale zachte stralen: 8 - 9; Wervels: 32 - 33. Diagnosis: Nannocharax hadros is distinguished from all its congeners by the possession of a completely pored lateral line vs. incompletely in N. angolensis, N. dageti, N. hastatus, N. lineostriatus, N. machadoi, N. minutus, N. monardi, N. multifasciatus, N. ocellicauda, N. rubensteini, N. uniocellatus and N. wittei; 37-43 lateral line scales vs. fewer scales in N. ogoensis (36) and N. pteron (35), and more scales in N. elongatus (52-57), N. intermedius (46-55), N. lineomaculatus (47-53), N. luapulae (49-55), N. macropterus (45-47), N. maculicauda (55-61), N. niloticus (50-55), N. occidentalis (50-56), N. reidi (46-48), N. rubrolabiatus (45-50), and N. signifer (46-48); 14-16 circumpeduncular scales, vs. 12 in N. altus and N. schoutedeni; 11-12 scales between the dorsal and adipose fins, vs. 9-10 in N. brevis, and 8-9 in N. seyboldi (Ref. 127100). In N. hadros, the dorsal-fin origin is situated well behind the pelvic-fin origin, vs. origin situated anterior to pelvic-fin origin in N. ansorgii, N. fasciolaris, N. gracilis, N. hollyi, N. latifasciatus, N. micros, and N. taenia or at the same level as the pelvic-fin origin in N. fasciatus; Nannocharax hadros has the tip of the longest pectoral-fin ray extending beyond the vertical through the insertion of the pelvic fin, vs. not reaching the pelvic-fin insertion in N. parvus, and a large distance between the posterior margin of the anus and the insertion of first anal-fin ray, 5.5-8.4% of standard length vs. 0.9-1.9% in N. usongo and 2.2-3.8% in N. zebra; it is most similar to N. procatopus and can be distinguished from it by a higher number of pectoral-fin rays, 16-17 vs. 12-15, respectively, a deeper body at the anal-fin origin, 15.5-19.3% of standard length vs. 10.9-15.0%, respectively, and a smaller internostril distance, 11-16% of head length vs. 17-23%, respectively (Ref. 127100).
Found in a shallow water zone with a high current over the rocky substrate (Ref. 127100)
Levenscyclus en paargedrag
Maturiteit | Voortplanting | Paaien | Eieren | Fecunditeit | Larven
Katemo Manda, B., J. Snoeks, A. Chocha Manda and E. Vreven, 2021. Nannocharax hadros (Teleostei: Distichodontidae), a new species from the Kalule Nord River in the Upemba National Park, Upper Congo basin. Ichthyol. Explor. Freshwaters 30(4):317-330. (Ref. 127100)
Status op de Rode Lijst van het IUCN (Ref. 130435)
Gevaar voor de mens
Harmless
Gebruik door de mens
Meer informatie
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Estimates based on models
Fylogenetische diversiteitsindex (Ref.
82804): PD
50 = No PD50 data [Uniqueness, from 0.5 = low to 2.0 = high].
Trofisch niveau (Ref.
69278): 3.2 ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
