Parasitological and histopathological diagnosis of a non-native fish ( sp.) with a noticeable presence in a natural Brazilian river environment.

Nile tilapia is an exotic species produced in Brazilian aquaculture. The aim of this study was to constitute a pathological diagnosis in sp. with a noticeable presence in a river in southern Brazil, and to verify the origin of these fish in this natural habitat, an environment with high sanitary precariousness due to discharges of industrial effluents.

Dermocystidium sp. in the gills of farmed Oreochromis niloticus in Brazil.

The genus Dermocystidium is very comprehensive in the host and site of infection, however this is the first report of the occurrence of Dermocystidium sp. in the gills of Nile tilapia. This study was carried out in a fish farming located in the state of Santa Catarina, Brazil.

Three previous recorded species of Diesing, 1850 (Monogenea: Dactylogyridae) infecting cultured in southern Brazil.

The present study aimed to contribute to the monogenean dactylogyrids that occur in from an ornamental fish farm in southern Brazil. Samples of goldfish were obtained from a fish farm and the gills were removed and analysed to identify the species of to determine the levels of infestation. Three species of were found in the gills: , and .

Toxicity of formalin for fingerlings of var. and in vitro efficacy against Kulwièc, 1927 (Monogenea: Dactylogyridae).

The toxicity of formalin on var. and its anti-parasite effects against (Monogenea) in in vitro tests is analyzed. Specimens of were submitted to eight concentrations of formalin: 50, 75, 100, 125, 150, 175, 200, 250 mg L, in triplicate.

Neobenedenia melleni (Monogenea: Capsalidae) in ornamental reef fish imported to Brazil.

The capsalid monogenean Neobenedenia melleni is known as a lethal pathogen for captured marine teleost ornamental fish, if left untreated. This study reports the occurrence of N. melleni parasitizing four species of ornamental reef fish imported into Brazil and maintained in quarantine: Arabian angelfish (Pomacanthus asfur ), yellowbar angelfish (Pomacanthus maculosus), regal angelfish (Pygoplites diacanthus), and bluecheek butterflyfish (Chaetodon semilarvatus).

Development and health status of Centropomus undecimalisparasitized by Rhabdosynochus rhabdosynochus (Monogenea) under different salinity and temperature conditions.

This study evaluated the correlation of hematological parameters with the mean abundance of the monogenean helminth Rhabdosynochus rhabdosynochus in Centropomus undecimalis reared at different temperatures and salinities. The experimental conditions were: 28 °C/0 ppt (parts per thousand); 28 °C/15 ppt; 28 °C/32 ppt; 25 °C/0 ppt; 25 °C/15 ppt; and 25 °C/32 ppt. The prevalence was 100.

Hemato-immunological and biochemical parameters of silver catfish Rhamdia quelen immunized with live theronts of Ichthyophthirius multifiliis.

This study investigated the immunization by intraperitoneal injection (i.p.) (assay I) and immersion bath (assay II) with live theronts of Ichthyophthirius multifillis in Rhamdia quelen and its influence on the hemato-immunological and biochemical parameters.

Haematological and parasitological assessment of silver catfish Rhamdia quelen farmed in Southern Brazil.

This study evaluated for two years the haematological parameters and the occurrence of gill parasites in silver catfish Rhamdia quelen, farmed in the state of Santa Catarina, southern Brazil. Between March 2010 and January 2012, a total of 137 fish were caught in a fish farm to compare the haematological and parasitological analysis, during hot and cold seasons. Simultaneously, water quality parameters were measured in the pond to analyze the relationship between environmental conditions and haematology and parasitism.