Clarias pachynema

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Clarias pachynema Boulenger, 1903

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

Teleostei > Siluriformes (Catfishes) 鯰形目 (Catfishes) > Clariidae (Airbreathing catfishes) 塘蝨魚科 (Airbreathing catfishes)
Etymology: Clarias: Greek, chlaros = lively, in reference to the ability of the fish to live for a long time out of water.
More on author: Boulenger.

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

; 淡水 居於水底的. 熱帶; 6°N - 7°S

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

Africa: from the coastal rivers of south Cameroon (up to the Sanaga river) southwards to the Ogooué system in Gabon and the middle Congo basin in the Democratic Republic of the Congo (Ref. 78218). Outside this area also reported from the Lualaba/upper Congo (Ref. 106245), the Kouilou-Niari in Republic of Congo (Ref. 92841), the Niger Delta (Ref. 57129) and Cross River in Nigeria (Ref. 31256, 57129), and from the Chad (Ref. 13331). A report from the Oueme River in Benin needs confirmation (Ref. 57129, 81644).
非洲: 喀麥隆南方部的沿海河川;(向上到沙那加河) 在加彭與剛果河中游系統的奧克維河系統。

大小 / 重量 / 年齡

Maturity: Lm ?  range ? - ? cm
Max length : 35.6 cm TL 雄魚/尚未辨別雌雄; (Ref. 57129)

簡短描述 型態特徵 | 形態測量圖

背棘 (總數): 0; 背的軟條 (總數): 81-95; 臀棘 0; 臀鰭軟條: 63 - 76; 脊椎骨: 65 - 67. Diagnosis: head length 19.6-24.6% SL (Ref. 81644). Head pointed in dorsal outline; snout short; tooth plates small; eyes dorsally located; "dermosphenotic" and supraorbital bones joined in specimens over 80 mm SL (Ref. 248). Frontal fontanella long and narrow ("knife-shaped")(Ref. 248, 57129, 81644). Occipital process long and oval-shaped (Ref. 248). Distance between occipital process and dorsal-fin base 4.3-10.5% SL (m = 8.1) (Ref. 81644). Gill rakers long, slender and distantly set (Ref. 248), 11-19 on 1st gill arch (Ref. 81644). Suprabranchial organ well developed (Ref. 248). Pectoral spine serrated on both sides (Ref. 57129), strongly on posterior face, weakly on anterior face (Ref. 81644). 65-67 vertebrae (Ref. 57129). Coloration: no information on colour in life (Ref. 57129). Preserved specimens uniformly dark brown on back and sides, and yellowish-brown on belly (Ref. 57129, 81644). Vertical series of small white spots on flanks (Ref. 57129).
頭部尖的在背部的輪廓中; 吻短; 眼位於背面。 額骨囪門長而狹窄的;(刀狀的') 後頭骨突起長而橢圓形的。 那皮蝶骨的' 與上眼窩骨結合在超過 80 mm SL 的標本中。 齒板小的。 鰓耙長的, 細長的而且遠遠地豎立。 鰓前的器官發展良好的。 第二感覺管的開口在側面上規則排列的。

生物學特性     字彙 (例如 epibenthic)

Facultative air-breathing (Ref. 126274); Nothing is known on the biology and reproduction of this species (Ref. 78218).

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

非洲: 喀麥隆南方部的沿海河川;(向上到沙那加河) 在加彭與剛果河中游系統的奧克維河系統。

主要參考資料 Upload your references | 參考文獻 | 合作者 | 合作者

Teugels, G.G., 1986. A systematic revision of the African species of the genus Clarias (Pisces; Clariidae). Ann. Mus. R. Afr. Centr., Sci. Zool., 247:199 p. (Ref. 248)

IUCN 瀕危狀態 (Ref. 130435)

  無危 (LC) ; Date assessed: 29 April 2019

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

對人類具威脅

  無害處的





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Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00776 (0.00343 - 0.01757), b=2.97 (2.79 - 3.15), in cm total length, based on LWR estimates for this Genus-body shape (Ref. 93245).
營養階層 (Ref. 69278):  3.4   ±0.5 se; based on size and trophs of closest relatives
回復力 (Ref. 120179):  中等的, 族群倍增時間最少 1.4 - 4.4年 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref. 59153):  Low to moderate vulnerability (26 of 100).