Sodium fluoride induced histopathological changes in oesophagus and intestine of freshwater fisk, Tilapia mossambica (Oreochromis mossambicus).
Fluoride is considered to be a pollutant if it exceeds beyond the normal permissible limits. It occurs naturally in all forms of the life including the aquatic ecosystem.This study was performed to investigate the toxicity effect of sodium fluoride on freshwater fish, Tilapia (Oreochromis) mossambicus .Acute toxicity for 24,48,72 and 96hrs exposure of LC0 value was 30.0ppm and LC 50 value was 54.0ppm for 96hrsThe oesophagus and intestine revealed significant morphological alterations such as atrophy in the submucosa,flattening of the intestinal villi and swelling in the submucosa.The physiological and histological changes indicate sodium fluoride is very hazardous pollutant the fish.