Spotfin hatchetfish
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Characiformes
Family: Gasteropelecidae
Genus: Thoracocharax
Species:
T. stellatus
Binomial name
Thoracocharax stellatus
(Kner, 1858)
Synonyms

Gastropelecus stellatus Kner, 1858

Thoracocharax stellatus, the silver hatchetfish, spotfin hatchetfish, spotted hatchetfish or platinum hatchetfish, is a widespread hatchetfish found throughout South America including Venezuela, Colombia, Ecuador, Brazil, Peru, Bolivia, Paraguay, and Argentina[1] in the Amazon, Orinoco, Paraguay and Tocantins-Araguaia basins.[2] This species is one of the largest of the hatchetfishes. It is usually found in areas with abundant riparian vegetation.[1]

Description

A typical hatchetfish, Thoracocharax stellatus is superficially similar to Thoracocharax securis, but has a prominent dark spot in the dorsal-fin. In the wild, adults vary in length between 21–55mm,[3] but in captivity, can grow up to between 60–70mm[1],maximum length is 80mm.

Taxonomy

The genus Thoracocharax is monophyletic and is sister to Carnegiella and Gasteropelecus. Thoracocharax stellatus has four distinct lineages suggesting this species may represent a species complex.[4] The four lineages are found in the following rivers:

The genus name, Thoracocharax, is derived from the Greek θώραξ (thṓraks), meaning breastplate or cuirass coupled with the word Charax, type genus of the Order Characiformes, which comes from the Ancient Greek χάραξ (chárax), meaning a palisade of pointed sticks, in reference to the densely packed sharp teeth of the fish. The species epithet, stellatus, is Latin for starry or studded with stars, a reference to the fish's platinum-coloured shiny appearance.[1]

Diet

In the wild, feeding occurs at sunrise and sunset, and analysis of the stomach contents of 88 specimens indicates that this species is mostly insectivorous (99.6% of stomach contents were insects) and consisted mostly of ants, beetles, and mayflies.[5] Thoracocharax stellatus appears to be a specialist on terrestrial insects and feeds by leaping out of the water and taking insects from riparian vegetation.[5]

Aquarium care

Because of this fish's propensity to jump several meters out of water for feeding, a cover or lid may be necessary or floating plants over the water's surface.[1] An Amazon biotope-style tank is preferred (e.g. driftwood branches, sand substrate, leaf litter).[1] Breeding is difficult, but possible in single-species tanks.[6]

References

  1. 1 2 3 4 5 6 "Thoracocharax stellatus – Spotfin Hatchetfish (Gastropelecus stellatus) — Seriously Fish". Retrieved 2021-10-06.
  2. ↑ Weitzman, S.H. "Further notes on the relationships and classification of the South American Characid fishes of the subfamily Gasteropelecinae". Standford Ichthyological Bulletin. 7: 217–239.
  3. ↑ Silva, Edson Lourenço da; Centofante, Liano; Miyazawa, Carlos Suetoshi (2009). "Análise morfométrica em Thoracocharax stellatus (Kner, 1858) (Characiformes, Gasteropelecidae) proveniente de diferentes bacias hidrográficas Sul-americanas". Biota Neotropica (in Portuguese). 9 (2): 71–76. doi:10.1590/S1676-06032009000200006. ISSN 1676-0611.
  4. ↑ Abe, Kelly T.; Mariguela, Tatiane C.; Avelino, Gleisy S.; Castro, Ricardo M. C.; Oliveira, Claudio (2013-12-01). "Multilocus molecular phylogeny of Gasteropelecidae (Ostariophysi: Characiformes) reveals the existence of an unsuspected diversity". Molecular Phylogenetics and Evolution. 69 (3): 1209–1214. doi:10.1016/j.ympev.2013.07.005. ISSN 1055-7903. PMID 23871917.
  5. 1 2 Netto-Ferreira, André L.; Albrecht, Míriam P.; Nessimian, Jorge L.; Caramaschi, Érica P. (2007). "Feeding habits of Thoracocharax stellatus (Characiformes: Gasteropelecidae) in the upper rio Tocantins, Brazil". Neotropical Ichthyology. 5: 69–74. doi:10.1590/S1679-62252007000100009.
  6. ↑ Rejlková, Markéta (2020). "First Spotfin Hatchetfish aquarium breeding on record". Tropic Fish Hobbyist Magazine. October: 65.

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