分類 / Names
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Teleostei >
Clupeiformes (Herrings) >
Dorosomatidae (Gizzard shads and sardinellas)
Etymology: Microthrissa: Grek, mikros = small + Greek, thrissa, -es = shad (Ref. 45335).
More on author: Poll.
Environment: milieu / climate zone / depth range / distribution range
生態學
; 淡水 大洋性. 熱帶; 3°N - 7°S
Africa: Congo River system in Dungu River and its tributary Garamba River (Ref. 188), and Lower Congo River (Ref. 188) in Democratic Republic of the Congo (Ref. 47399). Also reported as Microthrissa cf. minuta from mouth of Niemba River, Lukuga River, an outflow of Lake Tanganyika, in Democratic Republic of the Congo (Ref. 93587).
非洲: 在棟占河與它的支流的剛果河上游流域, 加蘭巴河; 也剛果河下游。
大小 / 重量 / 年齡
Maturity: Lm ? range ? - ? cm
Max length : 4.3 cm SL 雄魚/尚未辨別雌雄; (Ref. 47399)
背棘 (總數) : 0; 背的軟條 (總數) : 12 - 15; 臀棘: 0; 臀鰭軟條: 18 - 21; 脊椎骨: 40 - 44. Diagnosis: Body moderately deep, its depth about 22-30% of standard length; scutes strongly keeled, 1 or 2 before base of first pectoral fin ray, 11-12 pre-pelvic and 6-8 post-pelvic scutes; snout pointed; lower jaw not or slightly projecting, included in upper when mouth closed, with small teeth limited to anterior part; pre-maxilla with 12-30 small conical teeth directed inwards; maxilla blade slender, more than 3 times as long as deep, upper edge with a ridge flared outward; posterior supra-maxilla small, spatulate, shaft as long as blade; lower gillrakers 18-22 (Ref. 188, 47399, 93833). Also characterized by 37-43 scales in a longitudinal series and anal fin with 18-21 rays (Ref. 47399). It resembles Microthrissa royauxi, which has fewer gillrakers but more anal fin rays, 14-17 and 23-27 respectively (Ref. 188). It is distinguished from Microthrissa whiteheadi by a lower number of teeth on the pre-maxilla, 12-30 vs. 32-40 in M. whiteheadi; and additionally by a higher number of lower gillrakers, 18-22 vs. 14-18, a lower number of anal fin rays, 18-21 vs. 20-25, and a lower number of pre-pelvic scutes, 11-12 vs. 13-16 (Ref. 46514, 47399).
身體中等縱深的; 鱗甲 (19 或 20 總數) 有明顯的龍骨, 第一個胸鰭鰭條的基底前的 1 或 2。 吻端尖的; 下頜不是突出, 包含在上面的內當嘴巴閉合時, 在瘉合處有小的齒; 顎骨細長的 (葉片超過 3 長度與深度比率), 上緣具有一個向外被搖曳的脊; 第二個上顎骨小的, 軸長達竹片狀的葉片。
A riverine species (Ref. 188).
出現於河。
Life cycle and mating behavior
Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 仔魚
非洲: 在棟占河與它的支流的剛果河上游流域, 加蘭巴河; 也剛果河下游。
Gourène, G. and G.G. Teugels, 1989. Révision systématique du genre Microthrissa Boulenger, 1902 des eaux douces africaines (Pisces, Clupeidae). Rev. Hydrobiol. Trop. 22(2):129-156. (Ref. 47399)
人類使用
漁業: 自給性漁業
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5312 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00912 (0.00433 - 0.01920), b=3.04 (2.87 - 3.21), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
營養階層 (Ref.
69278): 3.0 ±0.3 se; based on size and trophs of closest relatives
回復力 (Ref.
120179): 高度, 族群倍增時間少於 15個月 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
