Sarotherodon knauerae : fisheries

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Sarotherodon knauerae Neumann, Stiassny & Schliewen, 2011

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Sarotherodon knauerae
Male picture by Loiselle, P.V.

分類 / Names 俗名 | 同種異名 | Catalog of Fishes(, ) | ITIS | CoL | WoRMS | Cloffa

Actinopteri > Cichliformes (Cichlids, convict blennies) 鱸形目 (Cichlids, convict blennies) > Cichlidae (Cichlids) 慈鯛科魚類 (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 (Ref. 86429).

Environment: milieu / climate zone / depth range / distribution range 生態學

; 淡水 底中水層性, usually 0 - 3 m (Ref. 86429). ; 6°N - 5°N, 8°E - 9°E

分布 國家 | FAO區域 | 生態系 | 發現紀錄 | Point map | 簡介 | Faunafri

Africa: Lake Ejagham in Cameroon (Ref. 86429).

大小 / 重量 / 年齡

Maturity: Lm ?  range ? - ? cm
Max length : 7.7 cm SL 雄魚/尚未辨別雌雄; (Ref. 86429)

簡短描述 型態特徵 | 形態測量圖

背棘 (總數): 15 - 16; 背的軟條 (總數): 13-14; 臀棘 3; 臀鰭軟條: 10 - 12. Diagnosis: Sarotherodon knauerae 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 standard length (Ref. 86429). It further differs from sympatric Sarotherodon lamprechti 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% of head length vs. 22.5–28.4%, a higher total gill raker count, 24–30 vs. 20–25, and larger eyes, 24.0–31.2% of head length vs. 20.4–29.2% (Ref. 86429). It is distinguished from neighbouring riverine S. galilaeus populations from Cross, Wouri and Lower Niger rivers, S. g. multifasciatus and S. g. borkuanus by a shorter anal fin, 12.0–14.6% of standard length vs. 15.3–19.3%, 15.1–25.7% and 13.4–17.9% respectively; and narrower caudal peduncle, 12.8–14.5% of standard length vs. 16.0–18.7%, 13.9–18.3% and 13.6–17.4% respectively (Ref. 86429). It differs from S. caroli and S. linnellii in higher gill raker counts, 24–30 vs. 18–20 and 15–18 respectively; from S. g. sanagaensis in a lower preorbital depth, 17.8–23.0% of head length vs. 25.0–27.8%; and from S. g. boulengeri and riverine Sarotherodon galilaeus in a lower body depth, 36.5–43.9% of standard length vs. 44.5–50.0% and 43.5–44.6% respectively (Ref. 86429). Finally it differs from all other Lake Barombi Mbo Sarotherodon in a higher number of dorsal fin-rays, 13-14 vs. 10–12 (Ref. 86429).

生物學特性     字彙 (例如 epibenthic)

A gregarious, predominantly benthic species found in Lake Ejagham; present in all habitats and at all depths, but most common inshore, to 3 m, than in deeper zones (Ref. 86429). The species is a detritivore, taking detritus from both soft and hard substrates as well as from the water surface (Ref. 86429). Presence of numerous juveniles in the dry season, January-February, suggests that reproduction takes place predominantly in the rainy season, August-September (Ref. 86429). Males do not vigorously defend courtship territories with a bower; in aquaria Sarotherodon knauerae are maternal mouth brooders (Ref. 86429).

Life cycle and mating behavior 成熟度 | 繁殖 | 產卵場 | | 孕卵數 | 仔魚

In aquaria Sarotherodon knauerae are maternal mouth brooders (Ref. 86429).

主要參考資料 Upload your references | 參考文獻 | 合作者 : Kullander, Sven O. | 合作者

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 瀕危狀態 (Ref. 125652)

  未評估 

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

對人類具威脅

 





人類使用

漁業:
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Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5001   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01905 (0.00846 - 0.04293), b=3.01 (2.82 - 3.20), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
營養階層 (Ref. 69278):  2.5   ±0.1 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref. 59153):  Low vulnerability (10 of 100).