Ali Parsa - Department of health and aquatic diseases, Faculty of veterinary medicine, Islamic Azad University, Sannadaj branch, Sanandaj, Iran
Kiarash Ghanfili - Faculty of veterinary medicine, Islamic Azad University, Sanandaj branch, Sanandaj, Iran
Reza Fathi - Department of physiology, faculty of medicine, Halij University, Istanbul, Turkey

Today using herbal drug in animal husbandry has been extended. It’s obvious that the rainbow trout is one of the most important fishes for breeding. The Aloe vera plant in traditional medicine in the world has many beneficial effects. The purpose of this study is to determine the effects of oral usage of Aloe vera raw gel in intestinal microbial flora and some blood and liver parameters of The Rainbow Trout. For this purpose, 90 healthy fishes with approximate weight of 107±3/5 were chosen. They were put in 2 groups with 45 members and 3 repeated fishes for each one. The physical and chemical conditions of water chosen carefully. The raw gel of Aloe vera at a rate of 0.5% was added to daily meal. The research period lasted 3 months. Food conversion ratio, liver sampling, blood parameters and intestinal contents were estimated. The research showed that between the rate of feed conversion ratio in treatment group and control group was a meaningful relevance (p<0.05). Liver of control group had more Glycogen in dedicated coloring. Enzymes of Liver, crude protein, Albumin, Uric acid showed no changes (p>0.05). The rate of intestinal bacteria had no specific changes, but Lactobacilli increased and coliforms decreased significantly (p<0.05).The result showed that using Aloe vera raw gel can produce positive effects on feed conversion rate and population of microflora of intestine and also hepatic reserve of Rainbow Trout

Rainbow trout, Aloe vera, liver tissue, Intestine microflora, Blood parameters