Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Perciformes
(Perch-likes) > Cichlidae
(Cichlids) > Pseudocrenilabrinae
Etymology: Sarotherodon: Greek, saros, -ou = sawdust + Greek, ther = animal * Greek, odous = teeth (Ref. 45335); knauerae: Named for Mrs. Barbara Knauer, former technician at the Max-Planck-Institut (Seewiesen), who substantially supported UKS as a technician and friend during his PhD studies.
Environment / Climate / Range
Freshwater; pelagic. Tropical, preferred ?; 6°N - 5°N, 8°E - 9°E
Africa: endemic to Lake Ejagham, Cross River basin, Cameroon (Ref. 86429).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 7.5 cm SL male/unsexed; (Ref. 86429)
Morphology | Morphometrics
Sarotherodon knauerae sp. nov. is distinguished from all congeners by the possession of an inflated second pharyngobranchial element in the upper pharyngeal jaw, and is one of the smallest known Sarotherodon, reaching a maximum observed size of only 75.2 mm SL. It further differs from sympatric S. lamprechti sp. nov. in possessing a terminal (vs. prognathous) mouth, scaled pectoral fin base, short pectoral fins ending at or in front of anus (vs. reaching first anal fin-spine or beyond) and short pelvic fins ending well in front of anus (vs. reaching anus). Additionally, S. knauerae possesses a shorter upper lip (19.1–25.4 vs. 22.5–28.4 % HL), a higher total gill raker count (24–30, mode 28 vs. 20–25, mode 22), and larger eyes (24.0–31.2 % HL, mode 27.3 vs. 20.4–29.2 % HL, mode 22.8). Distinguished from neighbouring riverine S. galilaeus populations (Cross, Wouri & Lower Niger), S. g. multifasciatus and S. g. borkuanus by a shorter anal fin (12.0–14.6 % SL vs. 15.3–19.3 % SL / 15.1–25.7 % SL and 13.4–17.9 % SL) and narrower caudal peduncle (12.8–14.5 % SL vs. 16.0–18.7 % SL / 13.9–18.3 % SL and 13.6–17.4 % SL). It differs from S. caroli and S. linnellii in higher gill raker counts (24–30 mode 28 vs. 18–20 mode 19 / 15–18 mode 18), from S. g. sanagaensis in a lower preorbital depth (17.8–23.0 vs. 25.0–27.8 % HL) and from S. g. boulengeri and riverine Sarotherodon galilaeus in a lower body depth (36.5–43.9 vs. 44.5–50.0 % SL and 43.5–44.6 % SL). Finally it differs from all other Lake Barombi Mbo Sarotherodon in a higher number of dorsal fin-rays (13 or 14, mode 13 vs. 10–12, mode 11) (Ref. 86429).
Gregarious, predominantly benthic species; more common inshore (to 3 m) than in deeper zones; detritivore, taking detritus from soft and hard substrates and from water surface; males do not defend courtship territories with bower; reproduction probably takes place in rainy season (August/September); maternal mouth brooder in aquarium (Ref. 86429).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Neumann, D., M.L.J. Stiassny and U.K. Schliewen, 2011. Two new sympatric Sarotherodon species (Pisces: Cichlidae) endemic to Lake Ejagham, Cameroon, west-central Africa, with comments on the Sarotherodon galilaeus species complex. Zootaxa 2765:1-20 (Ref. 86429)
IUCN Red List Status (Ref. 109396)
CITES (Ref. 94142)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5001 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01585 (0.00703 - 0.03571), b=3.01 (2.81 - 3.21), based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 2.6 ±0.2 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278
): High, minimum population doubling time less than 15 months ().
Vulnerability (Ref. 59153
): Low vulnerability (11 of 100) .