The effect of Streptomyces ambofaciens KF792054 on growth indices, intestinal digestive enzymes and blood indices in juvenile grass carp (Ctenopharyngodon idella)

Articles in Press

Document Type : scientific research article

Authors

1 Department of Aquatic Reproduction and Breeding, Faculty of Fisheries and Environment, University of Agriculture and Natural Resources, Gorgan, Iran

2 University of Agriculture and Natural Resources, Gorgan, Iran

Abstract

The aim of this research is to use Streptomyces ambofaciens as a probiotic in the diet on growth indicators, intestinal digestive enzymes and blood indicators of grass carp juvenile (Ctenopharyngodon idella). During this research, 120 of grass carp juvenile with an average weight of 23.37 ±0.96 grams were kept for two weeks in the laboratory of the Fisheries Department of Zabol University to adapt to the nutritional and rearing conditions in 12 aquariums, 4 treatments and 3 replications. they were fed during 8 weeks with different levels (control, 105, 106 and 107 CFU/g) of Streptomyces ambofaciens. At the end of the experiment, the amount of growth and some indicators of nutrition were calculated, and the intestinal enzymes were measured by taking samples from the intestines of the fish. Results showed that Streptomyces ambofaciens had a positive effect on growth indicators so that weight gain (WG) and specific growth rate (SGR) in S2 and S3 treatments significantly increased and food conversion ratio (FCR) decreased compared to the control group. (P < 0.05).Also, the activity of intestinal protease and amylase increased significantly in the S2 and S3 treatments, while the lipase activity in the different treatments did not differ significantly. The number of white blood cells was significantly different between the control treatment and the treatment containing probiotics (P < 0.05). However, the number of red blood cells, hemoglobin and hematocrit was not significantly different between the control treatment and the treatments containing the probiotic Streptomyces ambophacines. In general, the results of this research showed that Streptomyces ambofacines bacterium improves the growth and feeding indicators of grass carp juvenile by increasing the activity of intestinal protease and amylase digestive enzymes, as well as increasing the number of white blood cells and thus improving non-specific immunity.

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Journal of Utilization and Cultivation of Aquatics

Articles in Press, Accepted Manuscript
Available Online from 19 February 2025

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