Spotfin Hatchetfish Care Guide
Thoracocharax stellatus is the largest common freshwater hatchetfish, a wide-ranging South American surface insectivore marked by a dark spot on its dorsal fin.
Overview
Thoracocharax stellatus is a freshwater hatchetfish of the family Gasteropelecidae and one of the largest commonly seen hatchetfishes. A prominent dark spot on the dorsal fin distinguishes it from the related Thoracocharax securis. It is a pelagic surface fish found in open water of larger rivers, usually where riparian vegetation is abundant.
Taxonomy
- Family: Gasteropelecidae
- Genus: Thoracocharax
- Scientific name: Thoracocharax stellatus (Kner, 1858)
Habitat
The species is widely distributed across tropical and subtropical South America, including the Amazon, Orinoco, Paraná, Paraguay and Tocantins-Araguaia river basins. It occurs in open surface waters of larger rivers, typically near overhanging bankside vegetation from which it gleans insects.
Tank requirements
- Minimum tank volume: 150 L
- Temperature: 22-28 °C (72-82 °F)
- pH: 6.0-7.5
- GH: 4-15 °dGH
- School size: 6 or more individuals
- Lifespan: 4-6 years
- A secure, tightly fitting lid is essential — it is a powerful jumper
Diet
Wikipedia reports the species as almost entirely insectivorous, with terrestrial insects such as ants, beetles and mayflies making up the great majority of stomach contents; it feeds by leaping from the water to take insects from riparian vegetation, mainly at sunrise and sunset. In the aquarium it should be offered floating and surface foods, including small live and frozen insects such as fruit flies, alongside dried preparations.
Compatibility
Thoracocharax stellatus is a peaceful, top-dwelling schooling fish that should be kept in groups of at least six. It mixes well with calm mid- and lower-water species such as larger tetras and discus. Aggressive or fin-nipping tankmates should be avoided.
Conservation status
IUCN Red List: Least Concern (assessed 2020). The species supports minor commercial fisheries and is traded as an aquarium fish.