Open AccessEffects of Rosemary ( Rosmarinus officinalis ) extract on growth, blood biochemistry, immunity, antioxidant, digestive enzymes and liver histopathology of rainbow trout, Oncorhynchus mykiss
Author(s) -
Karataş Tayfun,
Korkmaz Fatih,
Karataş Arzu,
Yildirim Serkan
Publication year - 2020
Publication title -
aquaculture nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 79
eISSN - 1365-2095
pISSN - 1353-5773
DOI - 10.1111/anu.13100
Subject(s) - rosmarinus , rainbow trout , biology , officinalis , antioxidant , catalase , superoxide dismutase , digestive enzyme , amylase , triglyceride , lysozyme , alanine transaminase , food science , zoology , endocrinology , biochemistry , cholesterol , enzyme , fishery , botany , fish <actinopterygii>
This research was designed to determine the effects of rosemary ( Rosmarinus officinalis ) extract on growth, blood biochemistry, immunity, antioxidant, digestive enzymes and liver histopathology of rainbow trout. In a 40‐day diet experiment, rainbow trout was fed with the experimental diets containing 0.4, 0.7, 1 and 3 g/kg of rosemary. 0.4 and 0.7 g/kg rosemary extracts had no significant effect on all parameters studied ( p > .05). The growth performance (SGR and WG) and feed utilization (FCR and FER) of the fish increased with the increase in the rate of rosemary in the feed ( p < .001). Additionally, only the final weight levels were significant at the linear level ( p < .05). Rosemary's 1 and 3 g/kg doses increased total protein, trypsin, amylase, lipase, superoxide dismutase (SOD), catalase (CAT), lysozyme, total immunoglobulin (IG) and white blood cell (WBC) levels when compared to control group. However, glucose, aspartate aminotransferase (AST), alanine aminotransferase (ALT), total cholesterol and triglyceride levels decreased significantly ( p < .001). Moreover, these doses of rosemary caused a significant reduction in steatosis of liver hepatocytes compared to the control group. In conclusion, the present study showed that rosemary may be useful in reducing the stress effects by increasing the growth, antioxidant, digestive enzymes and immunity levels, as well as reducing the rate of steatosis in the liver of rainbow trout.