Corrientes, Argentina
Corrientes, Argentina

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Domitrovic H.A.,Institute Ictiologia del Nordeste | Gonzalez A.O.,Institute Ictiologia del Nordeste | Flores Quintana C.I.,Institute Ictiologia del Nordeste | Rosciani S.A.,Institute Ictiologia del Nordeste | Hernandez D.R.,Institute Ictiologia del Nordeste
Revista Veterinaria | Year: 2015

Ovarian neoplasia is scarcely mentioned in teleosts, being specimens from ornamental species the most frequently reported. This paper describes for the first time the characteristics of a spontaneous ovarian tumor from an adult specimen of boga (Leporinus obtusidens) obtained from the Paranaacute; River (Argentina). Macroscopically, in the abdominal cavity and in correspondence to the posterior third of ovarian, an irregular firm deformation with encapsulated cystic appearance was observed, presenting adherences between the ovarian membrane and the dorsal peritoneum. Samples of tumor and ovarian tissues were fixed in formalin and embedded in paraffin. Sections of 3 micron thickness were stained with routine, histochemistry and immunohistochemistry techniques. Histopathological observation of tumoral tissue revealed cystic structures and proliferating tumoral tissue. An amorphous material was found inside the cystic structures and was defined by a cellular coating of epithelioid appearance. The proliferating tumoral tissue showed procea pleomorphic aspect, being found areas of myxoid connective tissue with fusiform cells and abundant capillaries, mucoid tissue areas and polygonal cells placed isolated or forming islets near to the capillaries. The polygonal cells showed eosinophilic cytoplasm and large nuclei with loose chromatin and evident nucleoli, being observed some mitotic figures. These cells proliferated to form an epithelioid appearance tissue with intercalated capillaries, taking a spongy aspect on the periphery of some capillaries with a significant reticular fibers density. Also, thin collagen fibers and inflammatory infiltrate in the outermost zone of the tissue was observed. By analogy with the types described in mammals, it can be established that the lesion observed in this fish ovary corresponds to a mesenchymal origin tumor, with a morphology that resembles the perivascular epithelioid tumor (PEComa).


Almiron A.,National University of La Plata | Casciotta J.,National University of La Plata | Casciotta J.,National University of Central Buenos Aires | Pialek L.,University of South Bohemia | And 2 more authors.
Check List | Year: 2014

Rineloricaria reisi, R. stellata, and R. zaina are registered for the first time in freshwaters of Argentina. These three species were found in the Río Uruguay basin in Misiones Province. As a result of these findings, five species of Rineloricaria are found in the Río Uruguay basin in Argentina. A key of Rineloricaria species from that basin is also provided. © 2014 Check List and Authors.


Almiron A.,Paseo del Bosque | Casciotta J.,Paseo del Bosque | Ciotek L.,Parque Nacional Pre Delta | Giorgis P.,Parque Nacional Pre Delta | And 2 more authors.
Check List | Year: 2010

Brachyhypopomus bombilla, B. draco and B. gauderio are recorded for the first time in freshwaters of Argentina. These species were collected in the Río Paraná basin at the Iberá Wetlands and Pre-Delta National Park. Brachyhypopomus bombilla, B. draco and B. gauderio can be sympatric and syntopic in Pre-Delta National Park, whereas B. bombilla and B. gauderio occupy the same environments in the Iberá Wetlands. Some records of B. brevirostris for Argentina are misidentifications of B. gauderio, whereas others could correspond to one of these three species. © 2010 Check List and Authors.


Della Rosa P.,Institute Ictiologia del Nordeste | Roux J.P.,Institute Ictiologia del Nordeste | Sanchez S.,Institute Ictiologia del Nordeste | Ortiz J.C.,Institute Ictiologia del Nordeste | Domitrovic H.A.,Institute Ictiologia del Nordeste
Revista Veterinaria | Year: 2014

In Argentina, "sábalo" (Prochilodus lineatus) is the most important commercial fishing and subsistence species. However, in the past years the species reached a risk point, which motivated the captive culture driven by various public and private sectors interested in environmental conservation. This fish has a rapid growth, high fertility and rustiness. The aim of this study was to compare culture ponds for P. lineatus with two types of bottoms (concrete vs soil), in order to identify any condition that influence the productivity of the species. Four hundred offspring, 60 days-old and 26 g of body average weight, fed with balanced food representing 2% of the biomass, were used. Both water and biometric quality variables were recorded periodically, to adjust feed to fish growth. The experiment lasted 340 days. Water physical and chemical quality parameters remained within appropriate values for the species. Analyzed productive variables were specific growth coefficient, total biomass (with significant differences, p<0.05), and survival rate (with no significant differences between treatments, p>0.05). Results show that the concrete bottom ponds do not allow "sábalo" development as well as soil ponds do. However, concrete bottom ponds are an alternative for the production of the species which needs further evaluation in order to achieve the maintenance of an adequate amount of organic material that meet the needs of the species.


Rosa P.D.,Institute Ictiologia del Nordeste | Hernandez D.R.,Institute Ictiologia del Nordeste | Roux J.P.,Institute Ictiologia del Nordeste | Santinon J.J.,Institute Ictiologia del Nordeste | Sanchez S.,Institute Ictiologia del Nordeste
Revista Veterinaria | Year: 2012

The aim of this study was to evaluate the recovery from injuries in broodstocks of pacu (Piaractus mesopotamicus) using commercial flavonoids added to the food before or after hormonal manipulations (induction of final oocyte maturation and spawning). Thirty nine adults of pacu were randomized into three groups according to the type of food offered: (G1) commercial diet, (G2) commercial diet until reproductive manipulations and then changing to commercial diet plus 2 g/kg of Flavoxin®, and (G3) commercial diet supplemented with 2 g/kg of Flavoxin® throughout the experimental period. The experiment lasted 69 days and during this period of time ovarian biopsies were performed to follow up gonadal maturation. Prior to hypophysation, the broodstocks showed good general condition. However, immediately after reproductive procedures, it was observed a high number of injuries in tegument and fins in all the fish from G1 and G2, and low number of injuries in G3, which was statistically different (p<0.05). In G3, nine days after reproductive procedures no lesions were observed, whereas in G1 and G2, injuries were still present until the end of the experiment. The lowest survival rate was observed in G2 (60%), differing from G1 and G3 (p<0.05). These results demonstrate that the use of 2 g/ kg Flavoxin® added to the ration for P. mesopotamicus broodstocks prior to reproductive procedures allows a quick recovery from post-spawning injuries, thus improving health status.


Santinon J.J.,Institute Ictiologia del Nordeste | Hernandez D.R.,Institute Ictiologia del Nordeste | Sanchez S.,Institute Ictiologia del Nordeste | Domitrovic H.A.,Institute Ictiologia del Nordeste
Revista Veterinaria | Year: 2012

This study was conducted to assess the effect of stock density on growth and survival of juvenile Rhamdia quelen reared in a semi-intensive culture system. A total of 147 R. quelen with initial weight of 1.27 ± 0.45 g were placed at densities of 5, 10 and 20 fish/ m3(DI, DII and DIII, respectively) in nine experimental units. During a 47 days trial, fish were fed with a diet containing 35% of crude protein. Fish from DI showed a significant increase in weight gain compared to fish from DIII (p<0.05), while fish from Dll did not differ statistically from the other treatments (p>0.05). By contrast, the highest final biomass was obtained in DI 11, differing significantly from DI, while individuals from DII did not differ significantly with the other groups. Survival rate was higher than 90% in all groups, showing no significant differences between treatments (p>0.05). These results indicate that the middle density would be the most appropriate to obtain acceptable growth parameters and high survival rates.


Soneira P.,Institute Ictiologia del Nordeste | Casciotta J.,National University of La Plata | Almiron A.,National University of La Plata | Ciotek L.,Administracion de Parques Nacionales | Giorgis P.,Administracion de Parques Nacionales
Neotropical Ichthyology | Year: 2010

Astyanax erythropterus (Holmberg, 1891) originally described on the basis of one juvenile, is redescribed herein based on juveniles and adults from the type-localiy. The species differs from its congeners by the combination of 11-13 transverse rows scales above lateral line and 8-10 rows below lateral line; 49-54 perforated scales in the lateral series; iii-v,38-42 anal-fin rays, and dorsal, anal and caudal fins vermilion red in juveniles. The vermilion red coloration of unpaired fins in juveniles of Astyanax is only known in A. correntinus. © 2010 Sociedade Brasileira de Ictiologia.


Casciotta J.,National University of La Plata | Almiron A.,National University of La Plata | Sanchez S.,Institute Ictiologia del Nordeste | Iwaszkiw J.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia | Bruno M.C.,Centro Regional Of Estudios Genomicos
Journal of Applied Ichthyology | Year: 2013

Four species of the genus Gymnotus are present in Argentina: G. inaequilabiatus, G. omarorum, G. pantanal, and G. sylvius, the last three species being recorded for the first time in freshwater courses. Gymnotus omarorum, G. pantanal, and G. sylvius together with others of the genus Brachyhypopomus are the group of fishes that bear the greatest impact in the trade as live bait for sport fishing in the northeastern region of Argentina. Within this large area, only the provinces of Chaco, Corrientes, and Formosa have regulations for the catch, trade, and sale of species as live bait. Unfortunately, the species covered by legal regulations are Gymnotus carapo and Brachyhypopomus brevirostris, neither of which occurs in freshwater habitats of Argentina. Comments are included as to how this bad taxonomy affects the regulations and conservation status of these species. © 2012 Blackwell Verlag GmbH.

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