The effect of chlorpyrifos pesticide on tilapia (Oreochromis niloticus) resistant to mushroom (Pleurotus ostreaus) probiotic

Contaminants in aquatic ecosystems cause tissue damage in fish. In some cases, the effects of pesticide degradation on non-target organisms (aquatic) are greater than on target organisms (pests), which in turn causes faster and more aquatic deaths. The use of safety stimuli seems to be essential. The aim of this study was to investigate the effect of different prebiotic levels of Pleurotus ostreatus on histological characteristics of tilapia (Oreochromis niloticus) exposed to chlorpyrifos. This research was conducted in the fall of 2019. For this purpose, 120 tilapia fry were divided into 4 treatments for 42 days. Then, 0.5 ppm concentration of chlorpyrifos was added to each group for 16 days. At the end of the period, the fish were anesthetized with clove anesthetic solution (220 mg / l) and their liver tissue and gills were isolated for histological studies.  The results showed that the treatments exposed to 0.5 ppm chlorpyrifos (poisoned control without prebiotics) had the most destructive effect on liver and gill tissue. However, combined prebiotic treatments of Pleurotus ostreatus and chlorpyrifos improved tissue damage, indicating detoxification, and a concentration of 0.2 ppt Pleurotus ostreatus had the best performance against tissue damage to the liver and gills of tilapia, indicating improved resistance.