Effects of commercial herbal oil mixture on some hematological, biochemical and immunological parameters of rainbow trout (Oncorhynchus mykiss) and its preventive efficacy against Yersinia ruckeri infection
Publish place: Iranian Journal of Fisheries Sciences، Vol: 19، Issue: 3
Publish Year: 1399
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JIFRO-19-3_021
تاریخ نمایه سازی: 27 بهمن 1400
Abstract:
This study was conducted to evaluate the effects of different levels of a commercial herbal oil mixture (Mix-oil®) on the hematological, biochemical and immunological responses of rainbow trout as well as the resistance against infection with Yersinia ruckeri. The Mix-oil® includes, Thymus vulgaris, Origanum vulgare and Eucalyptus sp. essential oils. Experimental diets were supplemented with Mix-oil® at ۰ (control group), ۵۰, ۲۰۰ and ۴۰۰ ppm. Fish with an initial weight of ۳۱.۰± ۰.۱ g were divided into four groups and reared for ۵۶ days. The anti-bactericidal activity of Mix-oil® revealed that the minimum inhibitory concentration (MIC) value for Streptococcus iniae, Aeromonas hydrophila and Lactococcus garviae was ۶.۲۵ μl ml-۱ while it was ۱۲.۵ μl ml-۱ for Y. ruckeri. Significant improvements in red blood cell count, hematocrit, immunoglobulin, lysozyme, total protein, complement component C۳ and C۴, and alternative complement pathway (ACH۵۰) in fish fed with ۴۰۰ ppm Mix-oil® were observed compared with the control group (p<۰.۰۵). No significant difference was observed between different treatments in terms of MCV, MCH, MCHC levels and hemoglobin percentage aspartate aminotransferase (AST) and alanine aminotransferase (ALT) levels (p>۰.۰۵). The results suggested that dietary administration of Mix-oil® at the level of ۴۰۰ ppm could enhance hematological parameters and immune function of rainbow trout as well as the resistance against Y. rukeri. Thus, using Mix-oil® as an immunostimulant is recommended for farmed rainbow trout.
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Authors
A. Bababaalian Amiri
Department of Aquatic Animal Health and Diseases, Science and Research Branch, Islamic Azad University, Tehran, Iran
G. Azari Takami
Department of Aquatic Animal Health and Diseases, Science and Research Branch, Islamic Azad University, Tehran, Iran
M. Afsharnasab
Department of Aquatic Animal Health and Diseases, Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research Education and Extension Organization (AREEO), Tehran, I.R. Iran
A. Zargar
Department of Aquatic Animal Health and Diseases, University of Tehran, Tehran, Iran
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