Blackwing Hatchetfish (Carnegiella marthae)
| Blackwing Hatchetfish Carnegiella marthae | |
|---|---|
 | |
| Name | Blackwing Hatchetfish |
| Name Lat. | Carnegiella marthae |
| Family | Freshwater Hatchetfishes |
| Family lat. | Gasteropelecidae |
| Order | Characins |
| Order lat. | Characiformes |
| Origin | South America |
| Habitat | Tributaries, forest streams |
| Diet | Carnivore |
| pH | 4.0-7.0 |
| Behavior | Peaceful |
| Keeping | Group |
| Care Level | Moderate |
| Reproduction | Egg scatterer |
| Breeding | None reported |
| Life Span | 3-5 years |
| Protection | No |
| Metric Units | |
| Size | 3 cm |
| Temperature | 20-28 °C |
| Hardness | 1-10 °dH |
| Aquarium | 80 l |
| US Units | |
| Size | 1.2" |
| Temperature | 68-82 °F |
| Hardness | 18-178 ppm |
| Aquarium | 20 gal |
Distribution and habitat
The distribution area of the Blackwing Hatchetfish is the river system of the Rio Negro (Brazil) and indents in the upper Rio Orinoco (Colombia, Venezuela). They live in loose schools in weedy forest streams and small rivers, 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 feed as much as is eaten immediately (in a maximum of 10 minutes).
Behaviour and compatibility
They are peaceful, somewhat skittish fish and can be kept very well in a community tank with other peaceful and calm fish. At least 5, but preferably more Blackwing Hatchetfish should 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
They have powerful pectoral fin muscles which allow them to take off quickly from the water when fleeing and, propelled by quick strokes with their tail fin, they 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 at least fortnightly. Regular partial water changes are recommended, even if the pollutant 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: Werner Winter; 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