Dietary Myrtle (Myrtus communis L.) improved non-specific immune parameters and bactericidal activity of skin mucus in rainbow trout (Oncorhynchus mykiss) fingerlings

Mansouri Taei, Hadis and Hajimoradloo, Abdolmajid and Hoseinifar, Seyed Hossein and Ahmadvand, Hassan (2017) Dietary Myrtle (Myrtus communis L.) improved non-specific immune parameters and bactericidal activity of skin mucus in rainbow trout (Oncorhynchus mykiss) fingerlings. Fish and Shellfish Immunology, 64. pp. 320-324.

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Abstract

Summary 24 The present study examined the effects of dietary Myrtle (Myrtus communis L.) on non-specific 25 immune parameters and bactericidal activity of skin mucus in rainbow trout (Oncorhynchus 26 mykiss) fingerlings. Three hundred and sixty fingerlings (6.50 ± 0.55 g) were distributed in 27 twelve cages (65 × 65 × 65 cm) with a metal framework. The study included four treatments 28 repeated in triplicates. The treatments were feeding trouts with experimental diets containing 29 different levels (0, 0.5, 1 and 1.5%) of Myrtle powder. The fingerlings were fed on experimental 30 diet for sixty days and then skin mucus non-specific immune parameters as well as bactericidal 31 activity were measured. At the end of the trial, the highest skin mucus soluble protein level was 32 observed in group fed with 1.5% Myrtle (P < 0.05). The alkaline phosphatase (ALP) activity was 33 significantly increased in fish groups fed 1 and 1.5% Myrtle compared with the control group (P 34 < 0.05). However, evaluation of skin mucus lysozyme activity showed no significant difference 35 between treatments and control group (P > 0.05). Also, no antibacterial activity was detected 36 against Escherichia coli, Staphylococcus aureus and Salmonella enterica in all treatments and 37 control group. Whereas skin mucus of rainbow trout showed antimicrobial activity against fish 38 pathogens (Aeromonas hydrophila and Yersinia ruckeri) in 1 and 1.5% Myrtle treatments. These 39 results indicated beneficial effects of dietary Myrtle on mucosal immune parameters of fingerling 40 rainbow trout.

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