Marbled Hatchetfish - Carnegiella strigata fasciatus : Complete Fish Profile & Care Guide
Table of contents
Introduction
Marbled Hatchetfish (Carnegiella strigata fasciatus) are truly fascinating creatures that are sure to catch your eye in any aquarium. Their unique shape and behaviour make them stand out among other fish. These hatchetfish are known for their ability to jump high distances above the water's surface, thanks to a large muscle that propels them away from potential predators. They also swim in a peculiar, sideways manner that resembles a dead leaf floating on the water's surface, adding to their impressive repertoire of survival tactics.
While Marbled Hatchetfish are not the hardiest of species, they can thrive in a home aquarium with proper care. However, they are not recommended for beginner aquarists, as they are shy feeders and susceptible to Ich. These hatchetfish exemplify a reticent shoaling nature, forming substantial aggregations in their natural habitat. Consequently, it is imperative to maintain them in groups comprising a minimum of 6 individuals, preferably exceeding 10. This approach not only fosters a sense of security but also facilitates the manifestation of their intrinsic behavioural patterns.
It is best to keep them with other peaceful fish of similar sizes, as they are small and somewhat timid. When selecting suitable tank mates, it is essential to opt for diminutive and amicable species, as Marbled Hatchetfish are prone to be disconcerted by more assertive counterparts. Favourable companions may include small and peaceful Tetras, Pencilfish, Corydoras Catfish, as well as Dwarf Cichlids.
The domestic aquarium must attain a state of biological maturity and be subject to effective filtration while exercising discretion in maintaining water movement at a gentle pace. Fundamental to their well-being is the presence of soft, acidic water, a condition that can be facilitated by incorporating peat into the aquarium filter. Vigilant consideration should be directed towards water quality management, given the susceptibility of Marbled Hatchetfish to elevated nitrate levels and fluctuations in water chemistry.
Creating a conducive environment for these fish encompasses the integration of dark-themed décor, coupled with ample use of bogwood, caves, and vegetation, inclusive of floating varieties, to instil a sense of security. A crucial safety measure entails securing the tank with a tight-fitting lid, as these fish exhibit adept jumping behaviour. Additionally, vigilance in eliminating any escape points stemming from equipment feed-ins is imperative.
These fascinating fish have an attractive marbled cream and brown pattern on their deep, hatchet-shaped body. A striking golden line extends from their eye to their caudal fin, adding to their aesthetic appeal. Their mouths are located close to the top of their heads, making them well-suited for feeding at the water's surface.
Marbled Hatchetfish (Carnegiella strigata fasciatus) are often confused with their close relatives, the Marble Hatchetfish (Carnegiella strigata strigata), due to their similar names and appearances. However, the distinction lies in their specific marbling patterns and sometimes geographical distribution. While both subspecies share the characteristic hatchet shape, C. s. fasciatus tends to have a more pronounced marbled pattern, which helps enthusiasts and experts differentiate between them. Understanding these subtle differences is crucial for accurate species identification and providing the appropriate care.
Marbled Hatchetfish Photos
Sexual Dimorphism
Differentiating between male and female Marbled Hatchetfish is a relatively challenging task. However, when viewed from above, the female appears plumper and larger than her male counterpart. In some instances, you may also notice the presence of eggs inside the female, indicating that she is preparing to spawn.
Observing these subtle differences requires a keen eye and may not always be definitive without clear signs of spawning. For aquarists interested in breeding or accurately sexing their hatchetfish, paying close attention to the physical characteristics and behaviours during the pre-spawning period can provide valuable clues.
Quick Facts
| Scientific Name | Carnegiella strigata fasciatus |
|---|---|
| Year Described | 1864 |
| Kingdom | Animalia |
| Classification | Actinopterygii |
| Order | Characiformes |
| Family | Gasteropelecidae |
| Genus | Carnegiella |
| Origins | Venezuela , Brazil , Peru , Suriname , Guyana , Colombia , Bolivia |
| Max Size | 4.5 cm |
| Temperament | Peaceful |
| Aquarium Level | Top |
| Difficulty | Beginner - Intermediate |
| Shoaling | Yes |
| Best kept as | Groups 6+ |
| Diet & Feeding | Omnivore |
| Reproduction | Egg-Scatterer |
| Average Lifespan | Up to 5 Years |
Water Parameters
| Water Type | Freshwater |
|---|---|
| pH | 6 - 7 |
| GH | 4 - 8 |
| TDS | 18 - 179 |
| ℉ | 75 - 82 |
|---|---|
| ℃ | 24 - 28 |
Natural Habitat
In the lush waters of South America, the Marbled Hatchetfish can be found darting through the tributaries and streams of Bolivia, Colombia, Guyana, Suriname, Peru, and Brazil, as well as in the Rio Orinoco and Amazon River basins, including parts of Venezuela. These mesmerising Hatchetfish are true surface dwellers and spend virtually all of their time at the water's surface, often in groups. They are adept at feeding on insects and crustaceans, gracefully jumping out of the water to catch their prey. These fish are especially fond of dense surface vegetation, which offers them protection from predators and serves as a source of food.
Thriving in both blackwater and clearwater systems, Marbled Hatchetfish prefer environments with acidic pH levels, abundant in dense floating plants or overhanging vegetation. Such habitats not only provide safety from potential threats but also support their spawning activities and offer additional food sources when insects become entangled in the aquatic vegetation. Their shoaling nature, a key defensive strategy against predators, highlights the importance of social interaction within their species, making them a fascinating study of communal survival in the wild.
Breeding
Breeding the Marbled Hatchetfish (Carnegiella strigata fasciatus) in an aquarium can be a bit of a challenge, but with the right conditions, spawning can be encouraged. As these fish thrive in blackwater environments, the addition of peat to darken and soften the water provides an ideal breeding setting. A separate breeding tank with a thin layer of gravel substrate is necessary.
The water should be slightly acidic and soft, with the temperature slightly raised to around 28°C (82°F). Aim for a pH between 6.0 and 6.5. The tank should be dimly lit, and floating plants are a must, as they provide shade and act as a spawning medium. Additional spawning sites can include roots or fine-leaved plants, either real or artificial. A small, air-powered sponge filter will ensure filtration and mild water circulation, suitable for the eggs and fry.
The Marbled Hatchetfish undergo a lengthy courting process. It is recommended to breed them in small groups of 4 to 6 specimens, with a balanced sex ratio to reduce stress and ensure effective pairing. Condition them with a diet rich in small flying insects, crustaceans, and bloodworms to encourage spawning. After spawning, removing the parents is crucial as they may consume both eggs and fry.
The eggs will hatch within about 30 to 36 hours, and the fry will become free-swimming one to two days later. Initially, infusoria serve as an ideal food source for the first week; subsequently, they can be transitioned to brine shrimp or microworms. Around 20 days after hatching, the fry will start to develop the distinctive body shape of the adults and will swim in all areas of the aquarium.
Maintaining consistent water quality is paramount for the fry's development, necessitating regular, small water changes. This careful management ensures optimal growth and health as the young fish mature.
Diet & Feeding
In the domestic aquarium, providing a varied diet is crucial for the health and wellbeing of the Marbled Hatchetfish. Although they are not fussy eaters, a diet solely consisting of flake food will not suffice. To ensure adequate nutrition, these fish require regular protein-based meals such as mosquito larvae, bloodworms, fruit flies, or brine shrimp. These can be supplied live or frozen, and it is advisable to provide them daily. The food should be given at the water surface, as the Hatchetfish tend to feed exclusively in this area and need the food to stay afloat for a longer period.
