Black tetras
Black tetras | ||||||||||||
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Black tetra ( Gymnocorymbus ternetzi ) |
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Systematics | ||||||||||||
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Scientific name | ||||||||||||
Gymnocorymbus ternetzi | ||||||||||||
( Boulenger , 1895) |
The black tetra ( Gymnocorymbus ternetzi ) is a freshwater fish from the middle South America and comes into the flow systems of the Rio Paraguay and Rio Guaporé in Bolivia and in the central Rio Parana in Argentina before. The species was described in 1895 by the British ichthyologist George Albert Boulenger and named after C. Ternetz, who first caught the fish.
features
Black charcoal tetra are high-backed, strongly flattened on the sides and up to 5.5 cm long, they are peaceful schooling fish. Males stay smaller. The fish are silvery and show two deep black, broad transverse bands in the front half of the body, the first directly behind the gill cover, the second at the level of the attachment of the dorsal fin. Another vertical band runs through the eye. The rear half of the body, dorsal, anal and adipose fin are deep black in younger fish. The ventral and caudal fins are light-colored. The black color fades with age and turns gray, usually faster in females than in males.
- Fin formula : dorsal 11-12, anal 40-42.
- Scale formula : mLR 32-36, QR 7-8 / 8-9.
Aquaristics
The black charcoal tetra was introduced to Europe as an aquarium fish in 1935 and is now part of the standard range of pet supplies. Breeding is not very difficult, but it does require some preparation. There is also a cultivated form with elongated fins. A golden cultivated form can also be found. The fish are quite good eaters and can even swallow small flies.
Legal regulation in Austria
In Austria, the minimum requirements for keeping fish are defined in Regulation 486 in Section 7 and its Annex 5. See also the Wikipedia entry ornamental fish .
In addition, the following applies especially to black tetra: At least 5 animals of this species must be kept and the following limit values must be observed:
value | annotation | |
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Minimum size of the aquarium | 60 × 30 × 30 | Length × width × height in [cm] |
Area for the water temperature | 18-28 | Degrees Celsius [° C] |
Area for the water hardness | 0 - 30 | Degree of German total hardness [⁰dGH] |
PH range | 6.0-8.0 | Acidity |
Maximum value of nitrate | 50 | [mg / l] |
literature
- Günther Sterba : The world's freshwater fish. 2nd Edition. Urania, Leipzig / Jena / Berlin 1990, ISBN 3-332-00109-4 .
- Axel Zarske: Gymnocorymbus ternetzi. In: Claus Schaefer, Torsten Schröer (Hrsg.): The large lexicon of aquaristics. 2 volumes. Eugen Ulmer, Stuttgart 2004, ISBN 3-8001-7497-9 , Volume 1, p. 431 f.
Web links
- Blackjack tetra on Fishbase.org (English)
Individual evidence
- ↑ a b Rüdiger Riehl, Hans A. Baensch: Aquariums Atlas . Ed .: Hans A. Baensch. 15th edition. Mergus, Melle, Germany 2006, ISBN 3-88244-227-1 , pp. 262 .
- ↑ BGBl 486., 2nd Animal Husbandry Ordinance. Retrieved February 16, 2019 .
- ↑ BGBL II No. 486 Appendix 5, Minimum Requirements for Keeping Fish. Retrieved February 16, 2019 .