Investigation of growth and nutritional indices, histopathology of the intestine, and hematological parameters of rainbow trout (Oncorhynchus mykiss) fry fed with different levels of hydroalcoholic extract of Savory (Satureja hortensis)

Document Type : Research Paper

Authors

1 M.Sc. student, Department of Fisheries, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

2 Professor, Department of Fisheries s, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

3 PhD graduate, Department of Fisheries, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

4 PhD graduate, Department of Fisheries, Faculty of marine science and technology, university of Hormozgan, Bandar Abbas, Iran

10.22059/jfisheries.2024.374222.1421

Abstract

Using herbal extracts as nutritional additives in aquaculture industry increases the resistance of fish to infectious agents while also providing a substitute for traditional antibiotics, enhancing the immune system, and promoting the growth of fish. The present experiments were designed to investigate the effects of a diet containing hydroalcoholic extract of savory (Satureja hortensis) on the growth performance, hematological parameters, and histopathology of the intestine in rainbow trout (Oncorhynchus mykiss) fry. For this purpose, 240 rainbow trout fry with an average weight of 2.02 ± 0.02 grs were randomly distributed into 4 experimental groups with three replicates and fed diets containing concentrations of 0 (control), 0.1%, 0.5%, and 1% hydroalcoholic extract of savory for 6 weeks. The results showed that growth performance indices including final weight, body weight gain, and specific growth rate significantly increased in the group fed with a diet containing 1% extract compared to the control group. Additionally, the number of white and red blood cells, and hematocrit levels increased in the groups fed with savory extract (P<0.05). The use of hydroalcoholic extract of savory in the diet of rainbow trout fry had no negative effect on the distal intestine tissue of the fish in all groups. Overall, the results indicated that feeding with 1% hydroalcoholic extract of savory in the diet could improve the health and better growth of rainbow trout fry.

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References

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Journal of Fisheries
Volume 77, Issue 2
June 2024
Pages 135-146

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