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Pygocentrus nattereri, Red piranha : fisheries, gamefish, aquarium
> Characiformes (Characins) > Serrasalmidae (Piranhas and pacus) > Serrasalminae
Etymology: Pygocentrus:Greek, pyge = rump + Greek, kentron = sting (Ref. 45335). Eponymy: Dr Johann Natterer (1787–1843) was an Austrian naturalist and collector. [...] (Ref. 128868), visit book page. More on author: Kner.
Taxonomic Remarks Recent observation reveal NMW 16167 dry specimen as possible syntype. See Fink & Zelditch (1997:179) for taxonomic status. See Zbinden (1973) and Sazima and Machado (1990) for details on behaviour.
محیط زیست: محیط زیست / منطقه آب و هوایی / تغييرات عمق / محدوده توزیع بوم شناسي
; آب شيرين سطح زی; pH range: 5.5 - 7.5; dH range: ? - 20; رود رو (Ref. 126106). Subtropical; 23°C - 27°C (Ref. 13371); 9°N - 34°S
South America: Amazon River basin, Paraguay-Paraná River basin, northeastern Brazilian coastal rivers and Essequibo River basin (Ref. 39031). Reported from the Uruguay River, Brazil (Ref. 79585).
طول در اولین بلوغ / اندازه / وزن / سن
بلوغ: Lm? range ? - 15 cm Max length : 50.0 cm SL جنس نر / بدون خواص جنسي; (Ref. 81048); بيشينه وزن گزارش شده: 3.9 kg (Ref. 40637)
خارهاي باله پشتي (کل) : 0; شعاع نرم باله پشتي (کل) : 16 - 18; خارهاي باله مخرجي: 0; شعاع نرم باله مخرجي: 27 - 30. Body shape (shape guide): short and / or deep; Cross section: compressed.
Common in creeks and interconnected ponds in Matto Grosso, Brazil, where it influences distribution and feeding of other fish (Ref. 9080) and in areas of high primary production in Rio Machado and Rio Negro (Ref.9096). Adults feed mainly at dusk and dawn on insects, worms and fish (Ref. 7020). Medium-sized to large individuals (15-24 cm length) forage mainly at dawn, late afternoon and night up to about 2200H, whereas smaller fish (8-11 cm) are active mainly during the day (Ref. 9080). Teeth replacement on alternating sides of jaw allows continuous feeding. Its powerful dentition can inflict serious bites. Has a highly evolved auditory capacity and a 'lurking', then 'dashing' behavior during daytime. Shows hierarchies within small schools (Ref. 9077). Available information on body composition of 'piranha caju' flesh is 8.2% fat, 15.0% protein and 4.4% ash (Ref. 9251).
Males and females appear externally alike (Refs. 2279 & 9245). In 'Serrasalmus sp. aff. nattereri', reported to occur in the Orinoco basin (Venezuela, Guyana), the males have more 'bull-like' heads, but are more slender than females (Ref. 1672). Eggs are laid on tree roots trailing in the water and are guarded; the reproductive success may vary strongly from year to year depending on how the savanna was flooded (Ref. 9078). The eggs are large, adhere to plants and are not attacked by the parents. They hatch in 9 to10 days (Ref. 7020).
شاخص تنوع فیلوژنتیکی (مرجع 82804): PD50 = 0.5625 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.02089 (0.01377 - 0.03170), b=3.16 (3.04 - 3.28), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245).
سطح تروفیک (مرجع 69278): 3.7 ±0.61 se; based on food items.
Generation time: 1.7 ( na - na) years. Estimated as median ln(3)/K based on 1 growth studies.
جهندگی (مرجع 120179): متوسط, كمينه زمان لازم براي دو برابر شدن جمعيت 4/1 – 4/4 سال (K=0.89; tm=1; Fec=4,000-5,000).
آسیبپذیری ماهیگیری (Ref. 59153): Moderate vulnerability (44 of 100). 🛈
