Study of synergistic effects of potassium-sorbate and Lactobacillus casei on the digestive enzyme activity, intestinal histomorphology, and resistance against pathogenic bacteria (Yersinia ruckeri) in rainbow trout fry Oncorhynchus mykiss (Walbaum, 1792)

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Jafar nodeh a.; TUKMECHI A.; Najd Grami e.h.; HAJIMORADLOO A.M.; NOORI F.

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Journal: JOURNAL OF APPLIED ICHTHYOLOGICAL RESEARCH Year:2020 | Volume:8 | Issue:2 Page(s): 51-59

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Title

Study of synergistic effects of potassium-sorbate and Lactobacillus casei on the digestive enzyme activity, intestinal histomorphology, and resistance against pathogenic bacteria (Yersinia ruckeri) in rainbow trout fry Oncorhynchus mykiss (Walbaum, 1792)

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Keywords

O.mykissQ1

Organic acidsQ2

ProbioticQ1

Digestive enzymesQ1

HistomorphologyQ1

Abstract

To prevent the negative impacts of antibiotics, it is recommended to use other alternatives such as Probiotics, prebiotics, and Organic acids, which can have positive effects on the physiology of aquatic animals. This present study aimed to investigate the synergistic effects of organic acid (potassium sorbate) and Probiotic (Lactobacillus casei) on rainbow trout fry (O. mykiss). Three hundred and sixty rainbow trout fry (mean weight ± SE: 2. 45 ± 0. 05g) were provided and randomly distributed in six treatments with three replications for each treatment including commercial diet (control, treatment 1), 10 7 CFU/g Probiotic (L. casei) (treatment 2), a diet containing 0. 5% of potassium sorbate (treatment 3), a diet containing 1% potassium sorbate (treatment 4), a diet containing 0. 5% potassium sorbate and 10 7 CFU/g Probiotic (L. casei) (treatment 5), a diet containing %1 potassium sorbate, and 10 7 CFU/g Probiotic (L. casei) (treatment 6). The feeding trial was applied in two stages for a period of 60 days. At the end of the experiment, digestive enzyme activity, intestinal Histomorphology, and the resistance of fry fish against pathogenic bacteria (Yersinia ruckeri) were investigated. The highest alkaline phosphatase and protease enzyme were observed in treatment 5 and the lowest in the control group. Intestinal Histomorphology showed the highest length of Vili and its diameter in treatment 5 and 6 and the lowest was observed in the control group. After the resistance test against Y. ruckeri pathogen bacteria, the highest mortality rate was observed in the control group and the lowest observed in treatment 5 and 6. Based on the results of this study, it seems the use of combination Probiotic and organic acid in the diet can increase the production of rainbow trout

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APA: Copy

Jafar nodeh, a., TUKMECHI, A., Najd Grami, e.h., HAJIMORADLOO, A.M., & NOORI, F.. (2020). Study of synergistic effects of potassium-sorbate and Lactobacillus casei on the digestive enzyme activity, intestinal histomorphology, and resistance against pathogenic bacteria (Yersinia ruckeri) in rainbow trout fry Oncorhynchus mykiss (Walbaum, 1792). JOURNAL OF APPLIED ICHTHYOLOGICAL RESEARCH, 8(2 ), 51-59. SID. https://sid.ir/paper/401113/en

Vancouver: Copy

Jafar nodeh a., TUKMECHI A., Najd Grami e.h., HAJIMORADLOO A.M., NOORI F.. Study of synergistic effects of potassium-sorbate and Lactobacillus casei on the digestive enzyme activity, intestinal histomorphology, and resistance against pathogenic bacteria (Yersinia ruckeri) in rainbow trout fry Oncorhynchus mykiss (Walbaum, 1792). JOURNAL OF APPLIED ICHTHYOLOGICAL RESEARCH[Internet]. 2020;8(2 ):51-59. Available from: https://sid.ir/paper/401113/en

IEEE: Copy

a. Jafar nodeh, A. TUKMECHI, e.h. Najd Grami, A.M. HAJIMORADLOO, and F. NOORI, “Study of synergistic effects of potassium-sorbate and Lactobacillus casei on the digestive enzyme activity, intestinal histomorphology, and resistance against pathogenic bacteria (Yersinia ruckeri) in rainbow trout fry Oncorhynchus mykiss (Walbaum, 1792),” JOURNAL OF APPLIED ICHTHYOLOGICAL RESEARCH, vol. 8, no. 2 , pp. 51–59, 2020, [Online]. Available: https://sid.ir/paper/401113/en

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