Blue Perusal Mler
| Blue Perusal Mler | ||||||||||||
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Blue Perusal Mler ( Knodus borki ) |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Knodus borki | ||||||||||||
| Zarske , 2008 |
The blue Peruvian tetra ( Knodus borki ), English Cochu's Blue Tetra, is a freshwater fish from the family of the real tetra . The species has been sold under the scientific name Boehlkea fredcochui , Géry 1960 in specialist aquarium stores for years , but this was based on a wrong determination. In 2008 the species was re-described.
Occurrence
It is a shoal-forming tetras native to eastern Peru that reaches a length of about 5 cm. It occurs in the clay-colored and mineral-rich white water of the Rio Maranon , from Ecuador to Peru via Iquitos to the area around Leticia , Colombia .
features
The blue Perusalmler has a moderately elongated, laterally flattened body, which is covered by cycloid scales and of an olive base color. The greatest body height lies in front of the pelvic fins and is 2.7 to 3.3 times in body length. A broad longitudinal band extends from the rear edge of the gill cover to the base of the caudal fin, which is light blue in the female, purple in the male and sometimes outlined in black in the male. The tips of the dorsal and caudal fin are sometimes whitish. The maxillary has three to four three-pointed or conical teeth; Boehlkea fredcochui has 11 to 21 teeth. The premaxillary has two to five three-pointed teeth on the outer row and four teeth on the inner row. The number of gill fangs is 15 to 18. The lateral line of the Blue Perusalmlers is incomplete. The caudal fin base is scaled.
- Fin formula : dorsal ii, 7, (i); Anal iv-v, 21-23; Pectorals i, 11-12; Ventral i, 6; Caudal 1 / 9-8 / 1.
- Scale formula 6-14 (SL), 34-37 (mLR), 5/1/4 (QR)
Way of life
The Blauer Perusalmler reaches an age of 3 years with a maximum size of 5 cm. The pH value is acidic values from 5.8 to neutral 7.0 and a total hardness of 5 to 12 ° dGH and temperatures of 22 to 26 ° C. The females of the blue Peruvian mackerel look a bit more plump than the males.
swell
- Axel Zarske, 2008: Knodus borki sp. n.- a new tetra from Peru with a supplementary description by Boehlkea fredcohui Géry, 1966 (Teleostei: Characiformes; Characidae). Vertebrate Zoology 58 (2): 159-171. PDF
- Axel Zarske, 2008: Outwardly confusingly similar: Boehlkea fredcochui Géry, 1966 and Knodus borki Zarske, 2008
Web links
- Blauer Perusalmler on Fishbase.org (English)