INIBIOMA   20415
INSTITUTO DE INVESTIGACIONES EN BIODIVERSIDAD Y MEDIOAMBIENTE
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
The introduction of monogeneans with exotic freshwater fishes in Argentinean Patagonia
Autor/es:
G. VIOZZI; R. VEGA; A. WEICHEIN; C. RAUQUE; M. GONZALEZ
Lugar:
Río de Janeiro
Reunión:
Simposio; 7th International Symposium on Monogenea; 2013
Resumen:
The main motivations for introductions of fishes around the world have been esthetical, recreational, and to promote aquaculture. Also, accidental introductions due to the escape or release of aquarium fish are increasing. The Patagonic ictiogeographic region is characterized by a low species diversity, with 27 species of freshwater fish. Fourteen of these species are exotic and have been intentionally or accidentaly introduced into Patagonia, having established self-sustaining populations. Seven out of these 14, are salmonids. The non-salmonid species have restricted distributions, mainly in the northern limit of Patagonia. Evidences of monogenean transfer from African to American cichlids and vice versa have been reported in Mexico. Also, species of Dactylogyrus from the invasive common carp have been reported parasitizing native fishes in different places of the world. The aim of the present study was to detect introduction of monogenean species along with their exotic fishes in Northern Patagonia. Introduced fishes of the families Salmonidae (Salmo trutta, Oncorhynchus mykiss, Salvelinus fontinalis, Salmo salar), Cyprinidae (Cyprinus carpio), Characidae (Cheirodon interruptus), Anablepidae (Jenynsia multidentata), Poecilidae (Cnesterodon decemmaculatus), and Callichthyidae (Corydoras paleatus) were captured in the Negro, Neuquén and Limay rivers, transported alive (except for salmonids) to the laboratory, and examined for parasites. Eight non-native species of monogenean were registered: Dactylogyrus extensus and Dactylogyrus anchoratus from the gills and Pseudacolpenteron sp from pores of the scales of the the lateral line system of Cyprinus carpio; Philocorydoras paleatus from the gills of Corydoras paleatus; Ancyrocaphalinae sp. 1, Ancyrocephalinae sp. 2 from the gills, and Gyrodactylus sp1 from the skin of Cheirodon interruptus; and Gyrodactylus sp. 2 from the tegument of Jenynsia multidentata. The alien monogenean species outnumber the native one. Although Patagonian freshwater fishes have been extensively studied for parasites, only 7 native monogeneas have been reported: Philureter trigoniopsis, Gyrodactylus sp. from Galaxias maculatus, and Acolpenteron australe, Duplaccessorius andinus, Cryptocephalum petreum and Cryptocephalum spiralis from Percichthys trucha. Monogeneans has better opportunities to colonize new environments because they do not require an intermediate host, and despite of the high host-specificity of these parasites, the findings indicates the possibility of transmission to native Patagonian hosts.