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Siluriformes (Catfishes) >
Trichomycteridae (Pencil or parasitic catfishes) > Trichogeninae
Etymology: Trichogenes: Greek, thrix = hair + Greek, genes, genesis = birth, race (Ref. 45335).
Environment: milieu / climate zone / depth range / distribution range
Ecologie
; zoet water demersaal. Tropical; 20°C - 24°C (Ref. 13614)
South America: coastal streams between Rio de Janeiro and São Paulo States, Southeastern Brazil. Due to restricted distribution, specialized habitat, and differentiated populations, the vulnerable (VU B1+2bc) status in the IUCN List is proposed (Ref. 50917).
Grootte / Gewicht / Leeftijd
Maturity: Lm ? range ? - ? cm
Max length : 14.0 cm SL mannelijk / geslacht onbekend; (Ref. 50917); 10.6 cm SL (female)
Found in streams in the Atlantic forest; backwaters with no flow to 0.44 meter per second water flow. Dwells mostly in pools beneath small waterfalls in steep hill streams flowing over rocky and sandy substrates. Density varies from 3 to 25 individuals per square meter. At densities of 18 to 25 individuals per square meter, fish aggregates in loose groups of up to 30 individuals; largest ones tend to be solitary and territorial. Nektonic, active both during daytime and at night; juveniles and small adults of up to 9 cm TL are more active at daytime, whereas larger ones are active mostly at night. Uses visual, tactile, and chemo-sensory orientation to feed on bottom-dwelling aquatic and terrestrial arthropods in the water column or on the surface. Diet includes immature aquatic insects, crustaceans, adult terrestrial winged insects whole or fragmented, as well as carrion. Forages mostly by scanning the bottom, the barbels touching the substrate, but visual oriented drift feeding is also employed by individuals up to 5 cm TL. While foraging may bury into sand or plant debris and sifts through opercular openings and mouth. Reproduces at the onset of rainy season (austral summer). Mature oocytes about 0.2 cm diameter; pterigyolarvae range 1-1.5 cm TL. Spotted color pattern differs consistently between stream populations, an indication of genetic differentiation (Ref. 50917).
Levenscyclus en paargedrag
Maturiteit | Voortplanting | Paaien | Eieren | Fecunditeit | Larven
Burgess, W.E., 1989. An atlas of freshwater and marine catfishes. A preliminary survey of the Siluriformes. T.F.H. Publications, Inc., Neptune City, New Jersey (USA). 784 p. (Ref. 6868)
Status op de Rode Lijst van het IUCN (Ref. 130435: Version 2024-1)
Gevaar voor de mens
Harmless
Gebruik door de mens
Visserij: visserij voor eigen gebruik
Tools
Speciale rapporten
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Internetbronnen
Estimates based on models
Fylogenetische diversiteitsindex (Ref.
82804): PD
50 = 0.7500 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
Trofisch niveau (Ref.
69278): 3.4 ±0.46 se; based on food items.
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
