The present study investigates the efficiency of graded levels (0, 0.25, 0.5, 1 and 2%) of sodium propionate
(SP) on Caspian white fish (Rutilus frisii kutum) fry growth performance, skin mucus immune response as
well as humoral immune parameters. Fish were divided into 5 groups repeated in triplicates and each
group were fed on experimental diets for 7 weeks. Growth performance parameters, skin mucus total
immunoglobulin (Ig) level, lysozyme, protease and alkaline phosphatase (ALP) activity as well as the
non-specific humoral immune response (total Ig, lysozyme, alternative haemolytic complement activity
(ACH50) were determined at the end of feeding trial. The results showed that supplementation of diet
with 0.25% SP significantly improved growth performance compared control group (P < 0.05). Evaluation
of skin mucus immune parameters revealed significant elevation in fish fed SP supplemented diet
(P < 0.05). Variation in the levels of responses was evident among different SP level and more pronounced
in 0.25% and 0.5% treatments. Regarding non-specific humoral response, remarkably increased
lysozyme and ACH50 activities were observed in 0.25% and 0.5% groups compared other treatments
(P < 0.05); highest level in 0.25% SP fed fish. No significant change was noticed for serum total Ig
compared control group (P > 0.05), except 0.25% SP treatment which was significantly higher than those
in other groups (P < 0.05). These results revealed that inclusion of administration of 0.25% and 0.5% SP in
early stage of the Caspian white fish culture could improve mucosal and non-specific immune responses
as well as performance.