Tilapia joka Thys van den Audenaerde, 1969

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

Classification	Actinopterygii \| Perciformes \| Cichlidae \| Pseudocrenilabrinae
Synonyms	... more
Common names	乔克非鲫, Valkoraitatilapia, 喬克非鯽, ... more

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Main reference

Teugels, G.G. and D.F.E. Thys van den Audenaerde. 1991. (Ref. 5163)
Other references | Biblio | Coordinator : Kullander, Sven O. | Collaborators

Size / Weight / Age

Max length : 9.6 cm TL male/unsexed; (Ref. 5163)

Environment

Benthopelagic; freshwater; pH range: 6.0 - 8.0; dH range: 5 - 12

Climate / Range

Tropical; 23°C - 25°C (Ref. 2060)

Africa: lower courses of rivers from Sierra Leone and western Liberia.
Countries | FAO areas | Ecosystems | Occurrences | Introductions

Short description

Dorsal spines (total): 15 - 17; Dorsal soft rays (total): 11 - 13; Anal spines: 3; Anal soft rays: 8 - 9. Diagnosis: micro-gillrakers absent; small-sized specimens; dorsal fin with 15-17 spines and 11-13 soft rays (mean 17.12); anal fin with 3 spines and 8-9 soft rays; narrow scaly sheet at the base of anal fin; 7-9 lower gill-rakers (Ref. 53405). Description: head rounded; mouth small, subterminal; inner jaw teeth tricuspid, outer jaw teeth bicuspid and spatulate, posterior pharyngeal teeth bicuspid but posterior and median teeth not broadened; lower pharyngeal bone as long as broad, toothed part longer than or as long as anterior part; scales cycloid (Ref. 53405). Coloration: in life: ground color dark brown to blackish, sometimes with some narrow, yellowish cross bars on sides and head, 1st just behind eye, 2nd from occiput through hind angle of gill cover to before pectoral-fin base, 3rd just behind pelvic-fin bases, 4th midway between 3rd bar and anus, 5th at level of anus, 6th at level of third anal-fin spine, 7th near hind part of anal fin, and 8th on caudal peduncle; head dark brown, with lighter or yellowish narrow band between eyes and horizontal band on snout, one from eye to upper lip, and broader one on anterior part of cheek below eye; yellowish bands may disappear suddenly, possibly controlled by nervous system; hind angle of gill cover blackish, with small yellow spot at centre; lower lip pale, unlike upper lip and chin which are darker; pectoral fins yellowish to transparent; pelvic fins brownish-black, lighter anteriorly, especially in juveniles; dorsal, anal and caudal fins brownish-black, darker at base; spinous part of dorsal fin with some lighter spots; upper margin of dorsal and caudal fins red in adults (Ref. 53405).


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 vulnerability (12 of 100)	Not marketed/unknown

Entered by Sa-a, Pascualita

Modified by Sa-a, Pascualita

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Page last modified by : elaxamana, 15 July 2009

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