Growth performance, body composition, survival and haematological changes in rainbow trout, Oncorhynchus mykiss, juveniles following dietary administration of NEXT Enhance150 (Thymol and Carvacrol)

Subject Areas : New Technologies in Aquaculture Development

Received: 2020-06-24 Accepted : 2020-06-24 Published : 2018-11-22

Keywords: growth, Rainbow trout, Carvacrol, Keywords: Thymol,

Abstract :

Abstract[1] In the present study we determined growth performance, carcass quality and hematological parameters of Oncorhynchus mykiss juvenile (initial weight 8.4±0.1 g) fed diets containing Thymol-Carvacrol powder at the levels of 0, 1.0, 2.0, 3.0 g kg-1. Each diet was fed to triplicate groups of fish at 45 days consecutive. Results showed that fish fed diets containing Thymol-Carvacrol had significantly higher growth than the control group. Survival was not different among all dietary treatments. The number lymphocyte increased when Thymol-Carvacrol used at higher levels. No significance difference in RBC, WBC, MCV, MCH and MCHC was observed. Furthermore, whole body lipid content was higher in fish fed 1.0 and 2.0 g kg-1 Thymol-Carvacrol than the other groups, but body protein in group fed 3.0 g kg-1 was higher than the other groups. Also, body ash in control group was higher than the other groups. Whole body dry matter was not affected by dietary treatments. These results indicated that dietary administration of Thymol-Carvacrol can influence some growth, hematological parameters and tissue composition in rainbow trout juveniles. *Corresponding author; [e-mail]