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Fluconazole (FLZ) is a new azole antifungal drug having no earlier record of its utilization for the treatment of fish diseases. A 55-days experiment was carried out to delineate the role of FLZ based medicated feed on haemato-immunological responses and prevention of fungal infection in Labeo rohita fingerlings. Three hundred and sixty fingerlings were randomly distributed into four experimental groups in triplicates. Four iso-caloric and iso-nitrogenous purified medicated feeds were prepared with 0, 100, 200 and 300 mg FLZ 100 g−1 feed. Haemato-immunological parameters like erythrocyte counts (EC), haemoglobulin (Hb), leucocyte counts (LC), packed cell volume (PCV), mean corpuscular haemoglobin (MCH), mean corpuscular volume (MCV), mean corpuscular haemoglobin concentration (MCHC), nitro-blue tetrazolium (NBT), albumin, globulin, total plasma protein were studied. The present study revealed that the continuous feeding of FLZ based feed for 15–30 days significantly (P < 0.05) increases the erythropoiesis, heme-synthesis, as well as the leucocytosis in rohu. However, all the doses exhibited equal protection from the infectious S. parasitica after 45 days of continuous feeding.Fluconazole improves blood quality in fish.Fluconazole at provide protection to Labeo rohita against Saprolegnia parasitica.Continuous feeding of fluconazole does not exhibit any observable adverse effect on fish health.