This study examined the impact of marine fungal fermented feed at various concentrations on the growth and blood profiles of African catfish Clarias sp.. Catfish with an average body weight of 0.74 ± 0.01 g were raised in an aquarium that measured 30 cm x 45 cm x 30 cm and contained 25 L of water. The feed was not fermented in this study (control), and the feed was fermented with marine fungi at various concentrations (using 0.5%, 1%, 2%, and 4% extract marine fungi). At 8:00 am, 12:00 pm, and 16:00 pm, fish were fed three times a day until they were completely satisfied. The results showed that feeding juvenile catfish marine fungal fermented diet resulted in significantly higher growth performance. The larger final biomass, faster growth, and lower feed conversion ratio were used to examine this. The generation of red blood cells in fish fed with fermented diets was higher and better than the control treatment, according to the results of the blood profile of catfish (P 0.05).