Effects of antifungal activity of Daenensis thyme (Thymus daenensis)and Mentha (Mentha longifolia)essential oils on rainbow trout(Oncorhynchus mykiss) eggs hatchability

n this study, rainbow trout (Oncorhynchus mykiss) eggs were treated with effective doses of Daenensis thyme, Thymus daenensis (20, 10 and 5 mgL-1) and Mentha, Mentha longifolia (10, 5 and 2.5 mgL-1), during incubation period (20 days) until hatching for 30 minutes per every other day as constant flow bath treatment method. The mortality level in normal control (without any treatment) was significantly higher than other groups (p < 0.05). Level of mortality in egg treated with Daenensis thyme at 20 mgL- 1 (12.01±0.357%) was significantly lower than both normal control (33.35±0.889%) and Mentha groups until the eyed-egg stage (p < 0.05). No significant different was seen between Mentha at 10 and 5 mgL-1mortality untileyed-egg stage(p > 0.05).