Infections by helminth parasites in "Puyenes", Galaxias maculatus (Galaxiidae, Salmoniformes), from Southern Argentina with special reference to Tylodelphys barilochensis (Digenea, Platyhelminthes)

The occurrence of Tylodelphys barilochensis, Acanthostomoides apophalliformis, Contracaecum sp. and Camallanus corderoi infecting Galaxias maculatus ("puyenes") was quantified for the first time in Lake Nahuel Huapi, southern Argentina. T. barilochensis was recorded in this lake for the first time. The role of G. maculatus population in transmission of parasites to the salmonids is more important for Contracaecum sp. (prevalence 14-34 per cent) and A. apophalliformis (prevalence 30-54 per cent) than for C. corderoi (prevalence 6-8 per cent). The absence of Diphyllobothrium spp. in samples shows that the G. maculatus population does not play any role in the life cycles of these important zoonotic parasites. The sex of the host had no effect on T. barilochensis abundance. Statistical differences in T. barilochensis abundance between "puyenes" of the same size class between sampling stations and positive correlation between prevalence of infected snails and T. barilochensis abundance in fish suggest that different stocks have been sampled. Factors influencing T. barilochensis abundance are discussed.

Infections by helminth parasites in "puyenes", Galaxias maculatus (Galaxiidae, Salmoniformes), from Southern Argentina with special reference to Tylodelphys barilochensis (Digenea, Platyhelminthes).

The occurrence of Tylodelphys barilochensis, Acanthostomoides apophalliformis, Contracaecum sp. and Camallanus corderoi infecting Galaxias maculatus ("puyenes") was quantified for the first time in Lake Nahuel Huapi, southern Argentina. T. barilochensis was recorded in this lake for the first time. The role of G. maculatus population in transmission of parasites to the salmonids is more important for Contracaecum sp. (prevalence 14-34%) and A. apophalliformis (prevalence 30-54%) than for C. corderoi (prevalence 6-8%). The absence of Diphyllobothrium spp. in samples shows that the G. maculatus population does not play any role in the life cycles of these important zoonotic parasites. The sex of the host had no effect on T. barilochensis abundance. Statistical differences in T. barilochensis abundance between "puyenes" of the same size class between sampling stations and positive correlation between prevalence of infected snails and T. barilochensis abundance in fish suggest that different stocks have been sampled. Factors influencing T. barilochensis abundance are discussed.

Water quality and fish surveys of Piedra del Aguila Reservoir 1993-1997

En este trabajo se presentan resultados del monitoreo bimestral que se realizó sobre la calidad del agua y los peces en el reservorio del Embalse Piedra del Aguila

La parasitofauna como indicador de cambios ecológicos: situación actual en el Embalse de Piedra del Aguila

Peces de diferentes especies provenientes del embalse de Piedra del Aguila fueron analizados a lo largo de 3 años. Su estado sanitario fue evaluado y la condición parasitológica analizada en profundidad, relacionando la misma con el desarrollo de este lago artificial como nuevo ambiente ecológico. Se registraron cambios en la parasitofauna de algunas especies y se discuten las tendencias observadas

[Reptiles as patients in veterinary practice]. / Reptilien als Patienten in der tierärztlichen Praxis.

Important diseases of reptiles are described with references to the diagnostic material and patients of the Institute of Zoology and Hydrobiology between 1984 and 1990. The commonest causes of mortality were pneumonia, parasites and poor husbandry. Problems associated with the increasing popularity of reptiles as pets, and appropriate treatments are discussed.

Histological studies on the effects of Apatemon cobitidis in its second intermediate host, the bullhead (Cottus gobio).

Pathological effects of Apatemon cobitidis (Trematoda) in its second intermediate host, the bullhead (Cuttus gobio) are described. Macroscopically pathology in bullheads is characterized by migrating and encysted metacercariae in body cavity, eyes, retrobulbous space, brain and rarely in muscles and subcutis. Histologically lymphohistiocytic reactions and hemorrhages could be observed. Migration of metacercariae in eyes and invasion of brain causes blindness and inability to adapt to the background. Other main life functions remain intact.

[Enrofloxacin, a new drug for ornamental fish]. / Enrofloxacin, ein neues Therapeutikum für Zierfische.

The compatibility and efficacy of enrofloxacin (Baytril) a newly developed antibiotic belonging to the quinolones, were tested for five ornamental fish species (Herotilapia multispinosa, Pterophyllum scalare, Symphysodon discus, Brachydanio rerio and Melanochromis johanni). The results prove that enrofloxacin has a high tolerance level for ornamental fishes and high efficacy against important bacterial diseases. 30 micrograms/l water over 5 hours are recommended for the treatment of ornamental fishes.

Reptilian viruses: isolation of parvovirus-like particles from corn snake Elapha guttata (Colubridae).

Parvovirus-like particles of about 30 nm in diameter were isolated from the corn snake (Elapha guttata) showing pneumonia. The DNA containing virus replicated in IgH2 cells at 30 degrees C inducing nuclear inclusion bodies.

[Diseases of ornamental fishes--significance for veterinary practice]. / Zierfischkrankheiten--Bedeutung für die tierärztliche Praxis.

Important diseases of ornamental fish are described at the background of the diagnostic material of the Institute for Zoology and Hydrobiology between 1981 and 1984. Invasions by ectoparasites and environmental factors are thought to be the most important causes of the disease. Regarding the possibilities in aquarias the most common methods of treatment are discussed.