Inclined swimmers
| Inclined swimmers | ||||||||||||
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Inclined swimmer ( Thayeria boehlkei ) |
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| Scientific name | ||||||||||||
| Thayeria boehlkei | ||||||||||||
| ( Weitzman , 1957) |
The oblique swimmer ( Thayeria boehlkei ) belongs to the family of the real tetras (Characidae) and occurs in the river basin of the Rio Araguaia in Brazil and in the Peruvian part of the upper Amazon . The species was named after J. Boehlke, an American ichthyologist .
features
The oblique swimmer has an elongated, laterally strongly flattened body and is seven centimeters long. Characteristic is its oblique swimming style, inclined about 30 ° to the longitudinal axis, and the wide black longitudinal band, delimited above and below by golden yellow lines, which extends from the rear edge of the gill cover to the end of the enlarged, lower caudal fin lobe . Of the three Thayeria species, Thayeria boehlkei has the longest longitudinal ligament. The back of the fish is greenish or bronze-colored, the lower half of the body is silvery to yellowish-olive. Males are slimmer, females, especially those with spawning roots , are fuller.
- Fin formula : dorsal 2/9, anal 3 / 13–16, pectoral 1 / 12–14, ventral 1/7.
- Dandruff formula : mLR 28–30, SL 6.
Way of life
The oblique swimmer is a lively and peaceful schooling fish that mainly lives near the surface of the water. It feeds on free-swimming small crustaceans, insects and swimming worms. Food on the bottom of the water is ignored. Oblique swimmers are oviparous and lay many eggs (up to 1000, according to the ornamental fish breeder Pinter even up to 3000). The fry hatch after 20 to 24 hours.
Systematics
The oblique swimmer belongs to the genus Thayeria and in the family of the real tetras (Characidae). The genus Thayeria is currently not assigned to any subfamily. It belongs to the Hemigrammus clade along with some other closely related genera .
Aquaristics
The oblique swimmers were first imported to Germany as an aquarium fish in the 1930s and are relatively often offered in specialist aquarists.
literature
- Hans A. Baensch & Rüdiger Riehl : Aquariums Atlas, Volume 1 . Mergus Verlag, 1997, ISBN 3-88244-101-1 .
- Günther Sterba : The world's freshwater fish. 2nd Edition. Urania, Leipzig / Jena / Berlin 1990, ISBN 3-332-00109-4 .
- Axel Zarske: Thayeria boehlkei. In: Claus Schaefer, Torsten Schröer (Hrsg.): The large lexicon of aquaristics. 2 volumes. Eugen Ulmer, Stuttgart 2004, ISBN 3-8001-7497-9 , p. 933 f.
Web links
- Inclined swimmers on Fishbase.org (English)
- Breeding Report on aquarium-online.info