分類 / Names
共通名の | 類義語 | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
(Perch-likes) > Cichlidae
(Cichlids) > Pseudocrenilabrinae
Etymology: Oreochromis: Latin, aurum = gold + Greek, chromis = a fish, perhaps a perch (Ref. 45335). More on author: Günther.
Environment: milieu / climate zone / depth range / distribution range
; 新鮮な水 底生の漂泳性. Tropical; 9°S - 15°S
Africa: Lake Malawi and its catchment (Ref. 118630), including crater lakes Kingiri, Ilamba and Massoko (Ref. 118638) and Upper Shire River (Ref. 37112).
Length at first maturity / サイズ / 重さ / 年齢
Maturity: Lm 26.9, range 20 - 37 cm
Max length : 36.0 cm SL オス/雌雄の選別がない; (Ref. 4967)
背面の脊椎 (合計): 16 - 17; 背鰭 (合計): 10-11; 肛門の骨 3; 臀鰭: 8 - 10. Diagnosis: A heavily-built large tilapia species with a wide rounded head; dwarf populations exist in some crater lakes, showing bony 'hunger-form' body shape (Ref. 118638). Females and juveniles with grey bodies and 6 or more vertical bars; males have a bright blue, occasionally white or green, 'mask' across the head; when fully ripe, the underside of most of the body can be black, with the upper surface a conspicuous white to pale blue; genital tassel can be long and branched, pinkish to bright yellow; females and non-territorial males are indistinguishable from Oreochromis karongae (Ref. 118638).
A semi-pelagic species (Ref. 4967), found in all kinds of habitats but seen mostly in shallow water; it is abundant in the southeastern arm of Lake Malawi, where it occurs in shallow, vegetated bays (Ref. 5595). It feeds on phytoplankton and sometimes from the sediment on the sand; diatoms constitute the major part of its diet (Ref. 5595). Major component of the fisheries catch in Lake Malawi (Ref. 118638). IUCN conservation status is endangered, due to declining population trend (Ref. 118638).
Life cycle and mating behavior
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
Mating behavior includes the T-stand, both partners alternately forming the horizontal part of the T. Eggs are laid in batches and immediately picked up by the female. Fertilization takes place both on the ground and in the mouth. Females brood eggs/young, guarding their fry until about 15 mm (Ref. 2781).
Trewavas, E., 1983. Tilapiine fishes of the genera Sarotherodon, Oreochromis and Danakilia. British Mus. Nat. Hist., London, UK. 583 p. (Ref. 2)
CITES (Ref. 115941)
水産業: 商業; 水族館・水槽: 商業
協力者画像Stamps, Coins Misc.音シガテラ（食中毒の名前）速度泳ぐ 型式カマOtoliths脳視覚
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01660 (0.00851 - 0.03237), b=2.99 (2.83 - 3.15), in cm Total Length, based on LWR estimates for this species & Genus-body shape (Ref. 93245
栄養段階 (Ref. 69278
): 2.1 ±0.00 se; Based on food items.
回復力 (Ref. 69278
): 手段, １．４年～４．４年の倍増期間の最小個体群 (K=0.24-0.45; tm=3).
弱み (Ref. 59153
): Moderate vulnerability (38 of 100) .