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Global fish production has reached to 179 MMT in which 82 MMT is shared from the aquaculture sector in 2018 (FAO, 2020). Aquaculture plays a substantial role in promoting the socio-economic status of poor people mainly in the developing countries through poverty alleviation and nutritional security (FAO, 2018). Carp culture is the mainstay of south-east Asia where majority of the fish farmers use mostly de-oiled rice bran (DORB) in aquafeed (Meshram et al., 2018) as it is cheap and regularly available (Veerina et al., 1993). Moreover,

A 60 days feeding trial was conducted to study the effects of dietary alginic acid (AA) on growth and haemato-immunological responses in Cirrhinus mrigala fingerlings. One hundred eighty fingerlings were randomly distributed into five treatments in triplicates. Five diets were prepared with graded level of alginic acid and were designated as: control (Basal feed + 0% AA), T1 (Basal feed + 0.2% AA), T2 (Basal feed + 0.4% AA), T3 (Basal feed + 0.6% AA) and T4 (Basal feed + 0.8% AA). Higher weight gain % and specific growth rate (SGR) were observed in T2 group. Feed conversion ratio (FCR) value was found significantly lower in T2 group. Total leucocytes and erythrocytes counts were significantly (P<0.05) increased in T2 group. Highest (P<0.05) haemoglobin content was observed in T2. Higher (P<0.05) serum protein, albumin and globulin were manifested in T2. Albumin/globulin ratio was lowest in T2 group. Higher respiratory burst activity (NBT) was observed in T3. Highest activity of catalase and super oxide dismutase (SOD) were manifested in T2. Lowest lactate dehydrogenase (LDH) and malate dehydrogenase (MDH) activities reported in T2. Overall findings suggested that alginic acid at 0.4% dietary level augments growth and haemato-immunological responses in C. mrigala fingerlings.