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Characiformes (Characins) >
Distichodontidae (Distichodus)
Etymology: Nannocharax: Latin, nannus = small + Greek, charax = a marine fish without identification (Ref. 45335).
Environment: milieu / climate zone / depth range / distribution range
Sinh thái học
; Nước ngọt Tầng nổi; pH range: 7.0 - 8.4; Mức độ sâu 1 - 2 m (Ref. 129519). Tropical; 18°C - 29°C (Ref. 129519)
Africa: Lower Lufira, Fungwe and Mwanza River (both smaller right bank affluents of the Upper Lualaba), Luvua basin and Lukuga basin in Democratic Republic of the Congo (Ref. 129519).
Bộ gần gũi / Khối lượng (Trọng lượng) / Age
Maturity: Lm ? range ? - ? cm
Max length : 3.8 cm SL con đực/không giới tính; (Ref. 129519)
Short description
Khóa để định loại | Hình thái học | Sinh trắc học
Các tia vây lưng cứng (tổng cộng) : 0; Các vây lưng mềm (tổng cộng) : 14 - 15; Tia cứng vây hậu môn: 0; Tia mềm vây hậu môn: 11 - 12; Động vật có xương sống: 37 - 38. Diagnosis: Nannocharax chochamandai can be distinguished from all its congeners by the following unique combination of characters: its body colouration, which consists of eight to 10 ovoid black blotches that overlie a longitudinal mid-lateral black stripes vs. largely unpigmented body with a black spot on the posterior portion of the caudal peduncle in N. hastatus, N. maculicauda and N. ocellicauda, six or seven rounded, well-spaced, mid-lateral black spots in N. gracilis, 17 black bars in N. fasciolaris, a broad black longitudinal band running on flanks along two rows of scales in N. latifasciatus, a thin black lateral band covering only the lateral line scales, extending from snout to median rays of caudal fin in N. taenia; a completely pored lateral line vs. incompletely pored in N. angolensis, N. dageti, N. lineostriatus, N. machadoi, N. minutus, N. monardi, N. multifasciatus, N. rubensteini, N. uniocellatus and N. wittei; 41-46 lateral line scales vs. 38-40 scales in N. altus, 37-40 scales in N. brevis, 36-37 scales in N. micros, 36 scales in N. ogoensis, 38 scales in N. pteron, 38-39 scales in N. schoutedeni, 52-57 scales in N. elongatus, 47-53 scales in N. lineomaculatus, 50-55 scales in N. niloticus and 50-56 scales in N. occidentalis; and a dorsal-fin origin that is situated before the pelvic-fin origin vs. origin situated behind the pelvic-fin origin in N. fasciatus, N. hadros, N. procatopus, N. reidi, N. rubrolabiatus, N. seyboldi and N. signifer or situated at the level of pelvic-fin origin in N. intermedius and N. parvus (Ref. 129519). Nannocharax chochamandai has a long distance between the anus and the articulation of the first anal-fin ray, 10.1-14.9% of standard length, vs. 0.9-1.9% in N. usongo and 2.2-3.8% in N. zebra; a high number of unbranched dorsal-fin rays, 11-12 vs. 9-10 in N. hollyi and N. ansorgii; a short pectoral fin, 21.6-28.4% of standard length and the dorsal fin translucent without band vs. 28.6-31.6% of standard length and dorsal fin with two brown bands in N. macropterus (Ref. 129519). Nannocharax chochamandai is most similar to N. luapulae and can be distinguished from it by a high number of branched soft rays in dorsal and anal fin, 11-12 and 8-9 vs. 9-10 and 5; a low number of lateral line scales, 41-46 vs. 49-55; a long pectoral fin, 21.6-28.4% of standard length, reaching the pelvic-fin insertion and being situated about mid-level of the dorsal-fin base, vs. 18.3-20.6% of standard length, not reaching the pelvic-fin insertion and being situated at the level of the anterior origin of the dorsal-fin base; a long pelvic fin, 24.3-30.6% of standard length, reaching the anal-fin insertion and being situated at the level of the last quarter of the dorsal-adipose fin distance, vs. 20.0-22.9% of standard length, not reaching the anal-fin insertion and being situated about mid-level the dorsal-adipose distance; and a long anal fin, 15.6-19.0% of standard length vs. 13.6-15.1% (Ref. 129519).
Life cycle and mating behavior
Chín muồi sinh dục | Sự tái sinh sản | Đẻ trứng | Các trứng | Sự sinh sản | Ấu trùng
Katemo Manda, B., J. Snoeks, E. Decru, J. Brecko and E.J.W.M.N. Vreven, 2023. Revision of Nannocharax luapulae Boulenger, 1915 (Characiformes: Distichodontidae) from the Upper Congo basin: evidence for a species pair. J. Fish Biol. 103(3):557-573. (Ref. 129519)
IUCN Red List Status (Ref. 130435: Version 2024-1)
Threat to humans
Harmless
Human uses
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = No PD50 data [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00447 (0.00189 - 0.01058), b=3.17 (2.96 - 3.38), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Mức dinh dưỡng (Ref.
69278): 3.1 ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
