The effects of different levels of sodium alginate extracted from macroalgae (Sargassum angustifolium) on growth performance and some indicators of the non-specific immune system of blood serum in rainbow trout (Oncorhynchus mykiss,) fry.

Document Type : scientific research article

Authors

1 Dept. of Aquaculture, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

2 Professor

3 Associate Prof

Abstract

The aim of this study was to investigate the effect of sodium alginate as a natural prebiotic on growth performance and some hematological parameters in rainbow trout . For this purpose, 432 rainbow trout with an average initial weight of 2.47 ± 0.31 were fed diets containing four levels of sodium alginate (0 (control), 0.5, 1, and 2) gr per kg of diet for 8 weeks. At the end of the experiment, growth and hematological indices were evaluated based on standard formulas were analyzed .The results showed that the final weight (FW), weight gain (WG), food conversion ratio (FCR) and condition factor (CF) improved in the treatments fed with sodium alginate and significantly different from those of control treatment (p < 0.05 ). specific growth rate (SGR) in the treatments fed with sodium alginate was the highest but there were no significantly differences between treatments (P>0.05). Based on the results obtained from the hematological indicators, the treatments fed with sodium alginate had the highest level of hemoglobin concentration, hematocrit (%), the number of red blood cells and white blood cells counts and MCHC. however, significant difference in Hematocrit ( %), and the number of white blood cells was observed between treatments fed with 2% sodium alginate and other treatments (P<0.05). No significant difference was observed in the MCH index between the experimental treatments and the control group (P>0.05). There were no significantly differences in MCH, between the experimental treatments and control group (P>0.05). MCV values in the treatments fed with sodium alginate was the lowest and the difference was significant compared to the control (P<0.05). Therefore, it can be concluded that the use of sodium alginate in the diet of rainbow trout leads to the improvement of growth performance and some hematological indices.

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