علوم زیستی دریا
Seyed Hashem Beitalavi; Hamid Mohammadiazarm; Milad Maniat
Abstract
In this study, in order to use prebiotics as one of the best solutions to maintain the health of farmed aquatic animals and increase their resistance against pathogenic instead of antibiotics, the effects of different levels of isomaltooligosaccharide (ISO) prebiotics on growth performance, biochemical ...
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In this study, in order to use prebiotics as one of the best solutions to maintain the health of farmed aquatic animals and increase their resistance against pathogenic instead of antibiotics, the effects of different levels of isomaltooligosaccharide (ISO) prebiotics on growth performance, biochemical body composition, and mucosal immunity of red tilapia (Oreochromis mossambicus × Oreochromis niloticus) were investigated. For this purpose, 300 pieces of red tilapia were randomly divided into 15 aquariums with capacity of 100 L in 5 treatments with 3 replications. Experimental treatments as described in the control treatment without ISO, first treatment: the diet containing 2.5 g/kg of ISO, second treatment: the diet containing 5 g/kg of ISO, third treatment: the diet containing 10 g/kg of ISO, and fourth treatment: the diet containing 20 g/kg of ISO. Therefore, the fish were fed ad libitum three times per day for 8 weeks. The result showed that the used prebiotic ISO improves growth and nutritional performance, body biochemical composition, and some biochemical parameters of blood serum in red tilapia. In addition, the mucosal immunity indices of fish were improved under the effect of diets containing prebiotic ISO. Among the experimental treatments, the third treatment had the best performance in terms of final weight (13.4±0.31g), food conversion factor (1.02±0.02), percentage of protein content of body (13.49±0.25), blood serum protein (4.66±0.10 gr/dl), globulin (3.23±0.02 g/dl), and mucus immune indices such as mucus protein (20.29±1.05 mg/ml), immunoglobulin (62.0±0.32 mg/ml) 7), and lysozyme activity (9.14±0.24 u/ml). Therefore, it could be concluded that the use of ISO prebiotics at the level of 1% can have beneficial effects on performance of juveniles red tilapia fish.