Histopathological analysis of tilapia gills (Oreochromis niloticus Linnaeus, 1758) exposed to sugarcane vinasse

摘要: Abstract Sugarcane vinasse is one of the main residues generated by transformation cane into ethanol. Because high organic content (COD), biochemical oxygen demand (BOD), low pH, large amount that this residue (15 l for every liter ethanol produced) and their use as fertilizer on sugarcane crop, potentially polluting to soil ecossystem percolation water too. Thus, study aimed assess toxicity analyzing Oreochromis niloticus gills exposed different dilutions (1%, 2.5%, 5% 10%) in two bioassays. The were collected, fixed analyzed using ultra morphological, histological, histochemical techniques. After exposure vinasse, a statistically significant reduction ridges present surface pavimentous cells was observed bioassays; such structures are responsible mucus retention, which helps protect tissue. In addition, an intumescence treatments with well increase chloridric cells. Some striking tissue changes detected epithelial detachment loss integrity secondary lamellae, causing rupture consequent hemorrhage. first bioassay, these at dilution, focus hemorrhage all dilution ratios. second disorganization only 2.5% vinasse. Moreover, both bioassays performed, mucous when compared control. Our results demonstrate toxic action caused histopathological animals four tested. This highlights need caution disposal soil, especially due its capacity being leached or percolated resources, could seriously damage aquatic fauna.