Stygichthys typhlops Brittan & Böhlke, 1965
Blind tetra
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Klassifizierung / Names Namen | Synonyme | Catalog of Fishes(Gattung, Arten) | ITIS | CoL | WoRMS | Cloffa
> Characiformes (Characins) > Acestrorhamphidae (American tetras) > Stygichthyinae
Etymology: Stygichthys: Greek, stygos = the underworld of ancient Greece mithology + Greek, ichthys = fish (Ref. 45335).
Etymology: Stygichthys: Greek, stygos = the underworld of ancient Greece mithology + Greek, ichthys = fish (Ref. 45335).
Umwelt: Milieu / Klimazone / Tiefenbereich / Verbreitungsgebiet Ökologie
; süßwasser pelagisch. Tropical; 16°S - 20°S
Verbreitung Territorien | FAO Gebiete | Ökosysteme | Vorkommen | Punkt Karte | Einführungen | Faunafri
South America: upper São Francisco River basin in Minas Gerais, Brazil.
Größe / Gewicht / Alter
The specimens were collected from two shallow wells, at Fazenda do Seu Roque which is still occasionally used as a source of water for cattle, and the shallow, abandoned well at Fazenda do Lajeado. Both have similar physico-chemical characteristics, with the pH and conductivity typical of limestone drainages (Fazenda do Seu Roque: pH 6.98, conductivity 0.683 μsm cm−1, 25·3°C and salinity 0·02; Fazenda do Lajeado: pH 7·0, conductivity 0·647 μsm cm−1, 25·8◦ C and salinity 0·02%). Laboratory and field observations demonstrate that this species is predominantly a midwater swimmer; when undisturbed, it remains almost stationary in midwater, with the body inclined at a 10-40° angle, head facing either up or down, or moving slowly, with the mouth slightly open. It is apparently solitary and when in groups (in laboratory), they remain indifferent to each other, not schooling and if there is contact by chance, it is followed by mutual avoidance movements, usually (but not always) with the smaller individual withdrawing for a short distance, some intraspecific agonistic biting attempts during feeding were also observed. The surface feeding behaviour in the laboratory of recently captured individuals, associated with the fact that phreatic waters are generally food-poor, suggests that in nature, these fish concentrate at the upper part of the aquifer where food input is higher in these sectors, as organic matter washes down from the surface. Ostracods were also observed in radiographs of the stomachs of five of the 16 specimens preserved in the field. Specimens were collected with hand nets and minnow-traps baited with commercial fish pellets and dry cat food. During collection with hand-nets in wells, the fish reacted with a quick fleeing movement only when the net was at close range. This reaction plus the limited responsiveness to live prey as initially observed in the laboratory, indicates a low dependence on mechanosensory systems, probably associated with the loss of the lateral line on the body. There is no clear reaction to light, because they are either insensitive to it or behaviourally unresponsive to light conditions (Ref. 84216).
Lebenszyklus und Paarungsverhalten Geschlechtsreife | Fortpflanzung | Ablaichen | Eier | Fruchtbarkeit | Larven
Hauptreferenz
Laden Sie Ihre Referenzen hoch | Referenzen | Koordinator | Partner
Proudlove, G.S., 1997. A synopsis of the hypogean fishes of the world. p. 351-354. In Proceedings of the 12th International Congress of Speleology, La Chaux de Fonds, Switzerland. vol. 3. (Ref. 27297)
IUCN Rote Liste Status (Ref. 130435: Version 2025-2 (Global))
stark gefährdet (EN) (B2ab(ii,iii)); Date assessed: 07 November 2018
CITES
Not Evaluated
Bedrohung für Menschen
Harmless
Nutzung durch Menschen
FAO - Publication: search | FishSource |
Mehr Information
Trophische Ökologie
Lebensmittel (Beutetiere)
Nahrungszusammensetzung
Nahrungsaufnahme
Lebensmittelrationen
Räuber
Lebensmittel (Beutetiere)
Nahrungszusammensetzung
Nahrungsaufnahme
Lebensmittelrationen
Räuber
Populationsdynamik
Wachstumsparameter
Max. Alter/Größen
Länge-Gewicht-Rel.
Länge-Länge-Verhältnis.
Längenhäufigkeiten
Massenkonvertierung
Rekrutierung
Dichte
Wachstumsparameter
Max. Alter/Größen
Länge-Gewicht-Rel.
Länge-Länge-Verhältnis.
Längenhäufigkeiten
Massenkonvertierung
Rekrutierung
Dichte
Lebenszyklus
Fortpflanzung
Geschlechtsreife
Reifung/Kiemen rel.
Fruchtbarkeit
Ablaichen
Laichaggregationen
Eier
Eientwicklung
Larven
Larven Pop.Dyn.
Fortpflanzung
Geschlechtsreife
Reifung/Kiemen rel.
Fruchtbarkeit
Ablaichen
Laichaggregationen
Eier
Eientwicklung
Larven
Larven Pop.Dyn.
Anatomie
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Gehirn
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Kiemenoberfläche
Gehirn
Otolith
Physiologie
Körperliche Zusammensetzung
Nährstoffe
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Schwimmart
Schwimmgeschwindigkeit
Visuelle Pigmente
Fischgeräusche
Krankheiten und Parasiten
Toxizität (LC50s)
Körperliche Zusammensetzung
Nährstoffe
Sauerstoffverbrauch
Schwimmart
Schwimmgeschwindigkeit
Visuelle Pigmente
Fischgeräusche
Krankheiten und Parasiten
Toxizität (LC50s)
Genetik
Genom
Genetik
Heterozygotie
Vererbbarkeit
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Genom
Genetik
Heterozygotie
Vererbbarkeit
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Menschenbezogen
Aquakultur-Systeme
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Zuchtlinien
Ciguatera-Fälle
Briefmarken, Münzen, Verschiedenes.
Aquakultur-Systeme
Aquakultur Profile
Zuchtlinien
Ciguatera-Fälle
Briefmarken, Münzen, Verschiedenes.
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Internet Quellen
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Schätzungen auf der Grundlage von Modellen
|
Phylogenetischer Diversitätsindex (Ref. 82804) |
PD50 = 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high]. |
| Bayesian length-weight | a=0.01995 (0.00906 - 0.04395), b=3.01 (2.83 - 3.19), in cm total length, based on all LWR estimates for this body shape (Ref. 93245). |
|
Trophische Ebene (Ref. 69278) |
3.0 ±0.4 se; based on size and trophs of closest relatives |
|
Widerstandsfähigkeit (Ref. 120179) |
hoch, Verdopplung der Population dauert weniger als 15 Monate. (Preliminary K or Fecundity.). |
|
Anfälligkeit der Fischerei (Ref. 59153) |
Low vulnerability (10 of 100). 🛈 |