Chinese sleeper
Amur Schläfergrundel ( Perccottus glenii )
The Amur Schläfergrundel ( Perccottus glenii ) (Russian Ротан, also known under the name Dewianka ) is a freshwater fish of the family of dental Schläfergrundeln.
Dissemination
The natural occurrence of the fish is in the Amurbecken the Russian Far East and northeastern China and northern Korea. Man the Amur Schläfergrundel but was also introduced in other regions of Russia and Poland and the Balkans and quickly spread as an invasive species. In 1997, the Amur Schläfergrundel reached for the first time the Danube. Since 2009, an occurrence in Charlotte Hofer pond area in Bavaria is confirmed, 500 km west of the previous limit of distribution.
Features
The Amur Schläfergrundel reaches a length of 14 to 25 cm and a maximum weight of 250 g you is without barbels and without lateral line canal. The pelvic fins are not grown together to form a suction disc. Male Amur Schläfergrundeln are blackish in the mating season with a green shimmer and show bright green spots on the trunk and on the unpaired fins, and a hump in the neck.
The dorsal fin is without spines.
Way of life
The Amur Schläfergrundel lives in stagnant water such as lakes, ponds, bayous and swamps with dense vegetation and even avoids slow flowing water. It tolerates low-oxygen water and is capable of drying out of the water body or a complete freezing in the winter buried in the ground to survive. Amur Schläfergrundeln live as predators of larvae ( tadpoles in particular ), small crustaceans, other invertebrates and fish, also may lead to cannibalism. In a small, enclosed pond the Amur Schläfergrundel is to wipe out the entire fish stock and all amphibian larvae in the situation.
Sexual maturity occurs at an age of one to three years with a body length of 6 cm. The mating season is in May and June. The elongated eggs (3.8 x 1.3 mm ) are placed at a water temperature of 15 to 20 ° C near the surface on roots, leaves or other substrates and adhere with sticky threads. The nest is guarded by the male until hatching of pelagic larvae.
Swell
- Amur Schläfergrundel on Fishbase.org (English)
- Perccottus dybowski, 1877 at A.N. Severtsov Institute of Ecology and Evolution (Russian)