Thayeria boehlkei

Angular float ( Thayeria boehlkei )

The helical swimmer ( Thayeria boehlkei ) belongs to the family of the Real tetras ( Characidae ) and comes in the stream area from the Araguaia River in Brazil and in the Peruvian part of the upper Amazon. The species was named after J. Boehlke, an American ichthyologist.

Features

The helical swimmer has an elongated, laterally strongly flattened body and seven inches long. It is characterized by its oblique, about 30 ° to the longitudinal axis inclined swimming behavior, and the wide black top and bottom limited by golden lines longitudinal ligament that runs from the rear edge of the gill cover to the end of the enlarged, lower caudal fin lobe. Of the three types of Thayeria Thayeria has boehlkei the longest longitudinal ligament. The back of the fish is greenish or bronze color, the lower body silvery to gelblicholiv. Males are slimmer, females, especially with spawning, plumper.

• Fins formula: Dorsal 2/9, Anal 3/13-16, 1/12-14 pectoral, ventral 1/7.
• Dandruff formula: MLR 28-30, SL 6

Way of life

The helical swimmer is a lively schooling fish, who is especially close to the water surface. It feeds on small free-swimming crustaceans, insects and floating worms. Food on the riverbed will be ignored. Angular float are oviparous and lay lots of eggs (up to 1000, according to the ornamental fish breeder Pinter even up to 3000). The fry hatch after 20 to 24 hours.

System

The helical 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 with some other closely related genera of the Hemigrammus clade.

Hunting and

The helical swimmers were imported in the 1930s for the first time to Germany as aquarium fish and is quite often offered in Aquaristfachhandel.