fish medium level

Thoracocharax stellatus (Kner 1858)

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Silver hatchetfish, Spotfin hatchetfish

Thoracocharax stellatus is commonly called ‘freshwater hatchet fish’ due to the shape of its body, with an impressive keel, which resembles the shape of a hatchet head. Their body has evolved in such a way thanks to the possession of an enlarged and strongly muscled chest belt, which resembles the shape of an war ax. This species is superficially similar to its only congener Thoracocharax securis, but can immediately be identified by the presence of a prominent dark spot in the dorsal-fin.

Distribution: Paraná, Amazon, and Orinoco River basins; widespread and in most South American countries: Argentina, Bolivia, Brazil, Colombia, Uruguay, Ecuador, Paraguay, Peru and Venezuela.

Submitted by
BAP

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Water Chemistry

Water information

Water type
Fresh water
Water color
Clear water
Water transparency
High
Concentration of sediments
Low
Water temperature
20-28 °C
Water flow/curent
Slow

Chemical parameters

pH
5.0 – 7.5
Conductivity
GH
KH
Dissolved Oxygen

Biology

Standard length
6.7 cm
Water volume (min. aquarium)
100 l
Social behaviour
Group fish
Behaviour description

Very peaceful but it can be nervous and jump out of the tank, so it is suggested to cover the water surface with floating plants. Thoracocharax stellatus will not compete well with boisterous species for food. Good tankmates include other fish that inhabit different parts of the tank.

Aggression grade
Peacefull
Activity
Day active
Sexual dimorphism

Females are noticeably rounder-bodied than males when full of eggs.

Nutrition in Nature

Remaining close to the shore, it feeds primarily on terrestrial insects.

Reproduction

Breeding tank set-up

No breeding records of the Thoracocharax stellatus are known.

Nutrition parents
Mating type
Spawning behaviour
Breeding habits
Substrate-spawning
Hatching period
Number of eggs in average
Parental care
Fry number
Nutrition fry
Notes on reproduction

Bibliography