Tylochromis sudanensis Daget, 1954

Catalog of Fishes (gen., sp.) | ITIS | CoL

Classification	Actinopterygii \| Perciformes \| Cichlidae \| Pseudocrenilabrinae
Synonyms	Tylochromis jentinki sudanensis, ... more
Common names	Sudaninseuloja, ... more

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Main reference

Lamboj, A. 2004. (Ref. 52307)
Other references | Biblio | Coordinator : Kullander, Sven O. | Collaborators

Size / Weight / Age

Max length : 26.0 cm TL male/unsexed; (Ref. 42518)

Environment

Benthopelagic; freshwater

Climate / Range

Tropical; 18°N - 5°N

Africa: Upper and middle Niger, and the rivers Bénoué, Cross and Wouri in Nigeria and Cameroon.
Countries | FAO areas | Ecosystems | Occurrences | Introductions

Short description

Dorsal spines (total): 13 - 16; Dorsal soft rays (total): 13 - 15; Anal spines: 3; Anal soft rays: 7 - 8; Vertebrae: 28 - 29. Diagnosis: 13 or fewer (rarely 14) gill-rakers along the lower limb of the first arch; 37-43 lateral line scales; head length 28.0-34.1% of standard length; predorsal length 36.5-43.2% of standard length; more gradual rise in dorsal spine length from the first to the sixth or seventh; pectoral fin relatively short, rarely reaching the level of the spinous anal fin (Ref. 52346). Description: moderately deep bodied; predorsal profile rises over the snout at an angle of about 45° to the horizontal, decreases abruptly over the eyes and rises again slightly less steeply to the dorsal fin origin; the resultant concavity in the orbital region is frequently pronounced; deepest body depth along the back lies at or a little behind the dorsal fin origin; lower jaw slightly oblique, sloping at an angle of about 10° to the horizontal when the mouth is closed; lower pharyngeal jaw relatively robust, even in juveniles; lips moderately fleshy and well developed, but not markedly so; inferior vertebral apophysis borne only on the third vertebral centrum, which is a large, rather broad wedgeshaped process which extends caudally and slightly underlaps the fourth vertebral centrum (Ref. 52346). Outer and inner jaw teeth monocuspid; posterior pharyngeal jaw teeth molariform (Ref. 53405). Stout, crenate rakers along the lower limb of the first arch (Ref. 52346, 53784). Stout epibranchial rakers along upper limb of first arch; the raker at the angle of the first arch is often forked (Ref. 52346). Micro-gillrakers present (Ref. 53405). 2 series of scales between the upper lateral line and the anterior part of the lower (Ref. 2756, 31256). Scales cycloid (Ref. 53405). 37-43 lateral line scales (Ref. 7378, 52346, 53405). 5.5-6 scales between upper lateral line and dorsal fin origin; 12-14 scales between lower lateral line and anal fin (Ref. 2756). Upper branch of lateral line terminates well in advance of the end of the soft dorsal fin, usually below the sixth or seventh ray from the free end; terminal canal bearing scales never descend scale rows; dorsal and ventral lateral line branches on the caudal fin extend almost to the fin periphery; median branch less well developed (sometimes entirely lacking) and usually does not extend much beyond halfway to the fin periphery; dorsal fin spines increase gradually in length to the sixth or seventh and are then more or less equal in length; anal fin rounded; pectorals relatively short, barely reaching the level of the spinous anal fin, even in the largest specimens; first branched pelvic ray often produced and filamentous, often reaching to the level of the soft anal fin (Ref. 52346). Caudal fin emarginate and finely scaled (Ref. 52346, 53784). Caudal fin in juveniles only scaled to the fin periphery at its dorsal and ventral margins (Ref. 52346). Coloration: body yellow-brown; mouth, cheeks, opercles, breast and belly whitish-silvery; many bodyscales with iridescent center (Ref. 52307). In life: silvery with golden longitudinal lines between scale rows; more or less distinct dark cross bars on upper part of sides; pectoral fins, anal and caudal fin yellow; pelvic fins grey; dorsal fin membrane with dark lines forming a light-meshed network; upper margin of dorsal and caudal fins bright red (Ref. 7378, 52346, 53405). Preserved specimens: uniformly light brown, with 7-8 narrow cross bars on the flanks extending beyond the midline (Ref. 7378, 52346, 53405). Ethmoidal region dark; opercular blotch diffuse; nape band short; dorsal fin smoky grey with rows of pale maculae; larger males with traces of a few small pale maculae on the proximal region of the anal fin; caudal fin of male streaked with numerous thin, dark caudal stripes; in juveniles only the alternate vertical stripes extend below the midline, the remainder extend only a little onto the dorsum in typical juvenile barring (Ref. 52346).

Prefers algae and plant matter, as well as invertebrates (Ref. 52307).


IUCN Red List Status (Ref. 57073)	Threat to humans
Not Evaluated	Harmless

Human uses


More information
Countries FAO areas Ecosystems Occurrences Introductions Ecology Diet Food items Food consumption Ration	Common names Synonyms Metabolism Predators Ecotoxicology Reproduction Maturity Spawning Eggs Egg development	Age/Size Growth Length-weight Length-length Length-frequencies Morphometrics Morphology Larvae Larval dynamics Recruitment	Other references Biblio Aquaculture Aquaculture profile Strains Genetics Allele frequencies Heritability Diseases Processing	Collaborators Pictures Stamps Sounds Ciguatera Speed Swim. type Gill area Otoliths Brains Vision

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Internet sources

Estimation of some characteristics with mathematical models

Resilience (Ref. 69278)

High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.)


Vulnerability (Ref. 59153)	Price category (Ref. 80766)
Low to moderate vulnerability (26 of 100)	Not marketed/unknown

Entered by Sa-a, Pascualita

Modified by Musschoot, Tobias

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Page last modified by : elaxamana, 15 July 2009

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