15 July 2020

Szendőfi and colleagues, 2018

Pisces Hungarici XII cover
Szendőfi B, Bérces S, Csányi B, Gábris V, Gál B, Gönye Z, Répás E, Seprős R, B. T, Kouba A, Patoka J, Weiperth A. 2018. Egzotikus halfajok és decapodák a Barát‐ és Dera‐patakban, valamint a torkolatuk dunai élőhelyein. Pisces Hungarici 12: 47-51. http://www.haltanitarsasag.hu/ph12/Szendofi_et.al_Pisces.Hungarici_2018.pdf

(English title: Occurrence of exotic fish and crayfish species in Barát and Dera
creeks and their adjacent section of the River Danube)


Thermal and urban waters are frequently subjected to the releases of aquatic pets, which often occur in unexpected assemblages of native and non‐native species. To document this, we conducted a half‐year‐long (January – July 2018) field survey the crayfish and fish species present in Barát and Dera creeks (two sampling sites per each) and sections adjacent to their mouth in the River Danube. Sampling sites were inspected monthly using a combination of catching methods. Altogether, four non‐native crayfish, ten nonnative and twelve native fish were recoded. Several individuals of spiny‐cheek crayfish (Faxonius limosus), marbled crayfish (Procambarus virginalis), red swamp crayfish (Procambarus clarkii) and Australian redclaw (Cherax quadricarinatus) were sampled in the thermal water tributary of Barát creek. The Dera creek was not influenced with the thermal or industrial warm water, but the urbanised area affected the water quality, which was still acceptable for occurrence of spiny‐cheek crayfish, marbled crayfish and red swamp crayfish. Besides already well established population of spiny‐cheek crayfish, also marbled crayfish and red swamp crayfish inhabited the River Danube itself. Seven non‐native decapods have been reported in the Hungarian wild so far. However, this is to our knowledge the first published report on co‐occurrence of three North‐American crayfish as well as a combination of North‐American and Australasian crayfish species in Europe. The new faunistic records of exotic live‐bearing fish species from the family Poeciliidae and their hybrids from Barát creek were also obtained. These findings highlight the significance of pet trade as an introduction pathway and thermal as well as urban waters as target sites for new introductions. Roles of established nonnative species and their possible spread are issues requiring further targeted research.

Keywords: biological invasion • thermal water • tributary • Danube

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