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Centrarchiformes (Basses) >
Percichthyidae (Temperate perches) > Percichthyinae
Etymology: Nannoperca: Latin, nannus = small + Greek, perke = perch (Ref. 45335); pygmaea: The specific epithet is the feminised form of the Latin noun 'pygmaeus' meaning 'dwarf', referring to it being the smallest of the pygmy perches; noun in apposition.
applied as a noun in apposition, and in Common name
Little Pygmy Perch applied in recognition of the relative small size.
البيئة: الوسط / المنطقة المناخية / نطاق العمق / نطاق التوزيع
البيئة
; المياه العذبة; مياه مخلوطة قاعية التغذية و المعيشة. Subtropical; 34°S - 35°S, 117°E - 118°E (Ref. 93277)
Oceania: Western Australia. The rarity of the species and restricted range requires urgent protection at the state and federal level.
الحجم / وزن / العمر
النضج: Lm ?  range ? - ? cm
Max length : 3.9 cm SL ذكر/ مختلط الجنس; (Ref. 93277)
وصف مختصر
مفاتيح التعريف | الوصف الخارجي | قياسات المظهر الخارجي
الأشواك الظهرية (المجموع) : 7 - 9; الأشعة الظهرية الناعمة (المجموع) : 8; شوكة شرجية: 3; أشعه شرجية لينه: 6 - 7. This species is distinguished by the following characters: small mouth; deeply notched dorsal fin; poorly developed two-part and interrupted lateral line; differs from N. australis, N. oxleyana and N. variegata in having an exposed and serrated preorbital bone and jaws just reaching to below the anterior margin of the eye (vs. a smooth and hidden preorbital and the jaws reaching to at least the pupil); from N. vittata by having 5-10 thin lateral stripes most obvious below lateral line and poorly developed tube scales (vs. well developed), a more distinct haloed blackish spot resembling an ocellus at the base of the caudal fin, the hind margin of the scales on the caudal peduncle are without distinct pigment, and the belly is without a colour pattern; from N. obscura in having a distinct ocellus at the base of caudal fin (vs. an indistinct barring), as well as a dark spot behind operculum and lack of dusky scale margins; from N. balstoni, in having an exposed rear edge of the preorbital (vs. hidden under the skin), fewer transverse scale rows (13 vs. 15-16), a smaller mouth (rarely reaching eye vs. reaching well beyond the eye), ctenoid body scales (vs. cycloid), generally fewer pectoral rays and a smaller maximum size (Ref. 93277).
Body shape (shape guide): fusiform / normal; Cross section: compressed.
The species is rare and restricted in its range. Inhabits tannin stained, acidic and shallow Melaleuca rhaphiophylla streams (Ref. 93277).
دورة الحياة وسلوك التزاوج
النضج | التكاثر | وضع البيض | بيض | الخصوبة | اليرقات
Morgan, D.L., S.J. Beatty and M. Adams, 2013. Nannoperca pygmaea, a new species of pygmy perch (Teleostei: Percichthyidae). Zootaxa 3637(4):401-411. (Ref. 93277)
حالة القائمة الحمراء للاتحاد الدولي لحفظ الطبيعة والموارد الطبيعية (Ref. 130435: Version 2025-2 (Global))
في خطر (EN) (B1ab(i,ii,iii,v)+2ab(i,ii,iii,v)); Date assessed: 09 January 2019
استخدامات بشرية
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مصادر علي الأنترنت
تقديرات تستند إلى النماذج
مؤشر التنوع الشُعبي الوراثي (مرجع 82804) |
PD50 = 0.5156 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.01047 (0.00402 - 0.02726), b=3.01 (2.79 - 3.23), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245). |
مستوى غذائي (مرجع 69278) |
3.1 ±0.4 se; based on size and trophs of closest relatives |
المرونه (مرجع 120179) |
عالي, الحد الزمني الأدني لتضاعف عدد أفراد المجتمع أقل من 15 شهر (Preliminary K or Fecundity.). |
ضعف الصيد (Ref. 59153) |
Low vulnerability (10 of 100). 🛈 |