PARASITES OF JENYNSIA MULTIDENTATA (CYPRINODONTIFORMES: ANABLEPIDAE) FROM TWO ESTUARIAL ENVIROMENTS OF BUENOS AIRES PROVINCE, ARGENTINA

MONTES MARTIN MIGUEL; MARTORELLI S.R

Valencia

Simposio; 9th International Symposium on Fish Parasites Valencia 2015,; 2015

The aim of this work was to describe and compare the parasites of Jenynsia multidentata collected in two estuarialenvironments of the Buenos Aires Province, Argentina. The Salado River Channel (Samborombón Bay) and the SauceChico River near the Bahía Blanca estuary. Fishes were grouped together according to their sex and age. Parasites werestudied alive and fixed with heat without pressure under slides and cover slips, then conserved in 10% formalin, stainedand mounted in Canada balsam. We calculated the prevalence, median intensity and abundance. Sixteen species ofparasites were found: one adult digeneans (Lecithaster confusus ); eigth metacercariae (Ascocotyle (P.) diminuta,Ascocotyle (P.) angeloi, Ascocotyle (P.) felippei, Ascocotyle (P.) hadra, Pygidiopsis macrostomum, Hemiuridae gen. sp.,Thylodelphys sp., Echinostomatidae gen. sp.); one metacestod ( Cyclophyllidea) , two larval nematods (L4 OrderSpirurida and Contracecum sp.), one monogenean (Gyrodactylus sp), two copepods (Ergasilus sieboldii and Lernaeacyprinacea) and one acanthocephalan (Wolffhugelia matercula). The high number of larval stages is in relation with therole of this fish as a link with the plankton species and upper stages in the food chain. The species number andabundance of parasites was bigger in Sauce Chico, this was probably for an increase in the ratio of encounter betweenparasite and fish due to the smaller size of this water body. We observed niche differentiation (or differentialsusceptibility) between males and females depending on the environment and the parasite considered.