AI Article Synopsis
- The study tested the antifungal effects of essential oils from oregano and laurel on Saprolegniasis in rainbow trout eggs during incubation.
- The essential oils were created through water distillation and were added to a growth medium, revealing a minimum inhibitory concentration (MIC) of 250 ppm and a minimum lethal concentration (MLC) of 500 ppm.
- The results showed that treating eggs with 500 ppm of oregano and laurel during water hardening led to the highest larval hatching rates compared to controls, indicating these essential oils are more effective than formalin in combating the disease.
Article Abstract
The present study investigated the antifungal effects of essential oils of oregano (Origanum onites) and laurel (Laurus nobilis) on Saprolegniasis, a disease that occurs in rainbow trout eggs during the incubation period. Oregano and laurel were ground after drying, and essential oils were obtained by water distillation method using a Clevenger apparatus. The essential oils were added to potato dextrose agar (PDA) at the rates of 1-1000 ppm, and the minimum inhibitory concentration (MIC) was determined as 250 ppm whereas the minimum lethal concentration (MLC) was determined to be 500 ppm for both plants. In the in vivo trials, fertilized eggs were treated with predetermined doses either by bathing during water hardening and incubation period or only during incubation period, and death rates were monitored during embryological development. The best larvae hatching rate was determined in 500 ppm oregano and 500 ppm laurel groups treated during water hardening plus daily as 82.11% and 79.87%, respectively. According to the results, it was determined that oregano and laurel essential oils exhibited better results in all doses compared with the negative control group, and 500 ppm dose had a better effect than the positive control group treated with formalin.
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