DETERMINATION OF STANDARD GILL MORPHOLOGY OF PACU (PIARACTUS MESOPOTAMICUS)

Abstract

To pathological assessments or recognition of changes in the morphology of these is necessary knowledge of a normal morphological pattern, being this then the goal of this study. Were collected 20 animals (Piaractus mesopotamicus), from cultivation environments the region of Grande Dourados, with total length of 35 cm and 750 g approximately. During data collection, the animals were anesthetized with benzocaine, euthanized and dissected for macroscopic evaluation of organs "in situ". After, collected the gills, fixed in Bouin solution and stained by the usual method Hematoxylin-eosin and alcian blue technique+ PAS. Macroscopically it was observed that these had brilliant crimson red coloration, located internally, protected by beeswax, with numerous traces spaced, filaments and secondary lamellae. Under light microscopy was possible to identify the branchial artery, cartilaginous structure, cells pillars, respiratory epithelium and mucous cells. We concluded that this species has a branchial structure very similar to that of other freshwater teleosteans, although more studies are necessary to compare this structure in all phases of his life and times of the year.