Giant Hatchetfish (Thoracocharax securis)
| Giant Hatchetfish Thoracocharax securis | |
|---|---|
 | |
| Name | Giant Hatchetfish |
| Name Lat. | Thoracocharax securis |
| Family | Freshwater Hatchetfishes |
| Family lat. | Gasteropelecidae |
| Order | Characins |
| Order lat. | Characiformes |
| Origin | South America |
| Habitat | Streams, rivers, lakes |
| Diet | Carnivore |
| pH | 6.0-7.5 |
| Behavior | Peaceful |
| Keeping | Group |
| Care Level | Moderate |
| Reproduction | Egg scatterer |
| Breeding | None reported |
| Life Span | 5-7 years |
| Protection | No |
| Metric Units | |
| Size | 7-9 cm |
| Temperature | 23-30 °C |
| Hardness | 4-15 °dH |
| Aquarium | 200 l |
| US Units | |
| Size | 2.8"-3.5" |
| Temperature | 73-86 °F |
| Hardness | 71-267 ppm |
| Aquarium | 50 gal |
Distribution and habitat
The range of the Giant Hatchetfish are widespread in the Amazon River system from Peru to Brazil to Argentinenin. They live in loose schools in slow-flowing streams, rivers and lakes, preferably in places with rich vegetation on the water surface.
Maintenance
The aquarium should have plants flooding to the water surface, stones and roots, as well as floating plants that serve as hiding places and dim the light. The soft, slightly acidic water should have a weak current. A gapless cover is necessary, because the jumpy animals can jump.
No ammonia, ammonium and nitrite should be detectable, the nitrate value should not exceed 100 mg/l. To ensure the water quality and oxygen content, a filter and heater adapted to the aquarium size is required, as well as lighting for the species-appropriate day-night rhythm of the animals.
Diet
They prefer to eat food from the water surface. The food supply consists of small insects such as mosquitoes, aphids, fruit and fruit flies, plus cyclops, daphnia and mosquito larvae, which are also well accepted freeze-dried or frozen. After habituation, high-quality dry food (flakes, granules) is also accepted.
Regular and varied feeding avoids deficiency symptoms. Only as much should be fed as is eaten within a few minutes.
Behaviour and compatibility
They are peaceful, somewhat shy fish and can be kept very well in a community tank with other peaceful and calm fish. At least 5, but better more Giant Hatchetfish must be kept together.
Basically, only mutually compatible fish species with similar demands on water conditions and water temperature may be socialized.
Sex dimorphism
The sexes can only be identified by the spawning of the female.
Reproduction and breeding
There are no known reports of successful breeding in the aquarium.
Important
Thoracocharax securis is very similar to Thoracocharax stellatus, which has a small dark spot on the dorsal fin.
Hatchetfishes have powerful pectoral fin muscles that allow them to take off quickly from the water when fleeing and, propelled by rapid strokes of the caudal fin, can fly up to 3 meters
The well-being of the fish should be monitored regularly. Temperature should be checked daily, pH, hardness and nitrate levels should be checked at least every 14 days. Regular partial water changes are recommended, even if the contaminant level has not yet reached the upper limit. Sudden changes in water quality should be avoided. Newly introduced fish must be accustomed slowly to the water in the aquarium.
Further literature can be found in your pet store.
References
Text: petdata; Image: petdata
Source: BMELV (1998): Tierschutzgutachten - Haltung von Zierfischen (Süßwasser); RIEHL & BAENSCH (2006): Aquarien Atlas Bd. 1, Mergus Verlag; ENGELMANN (2005): Zootierhaltung - Tiere in menschlicher Obhut: Fische, Verlag Harri Deutsch
- Gemäß § 21 Abs. 5 Tierschutzgesetz idgF