A study of the anesthetic effect of Zataria multiflora Boiss (Labiatae) essence on Oncorhynchus mykiss and cultured Salmo trutta caspius

For the first time in the world, the effect of Zataria multiflora essence in concentrations of 50 and 100 ppm on Oncorhynchus mykiss fry weighing on average 15~c2 g and cultured Salmo trutta caspius weighing on average 40~c4 g was studied. The water temperature was 16-17 degree C, dissolved oxygen was 7~c0.2 and pH was 8 during the investigation. O. mykiss and S. trutta caspius reached complete sedation during an average time of 3 and 2 minutes respectively in the two concentrations. The mean balance and recovery time were 2 and 3 minutes respectively. Results showed that the sedation and recovery time are significantly different in the two species and with the two concentrations of the sedative (P0.05). The research also showed that Z. multiflora essence has an anesthetic effect on the two species, but because of the unwanted severe irreparable breathing side effects and the accompanied body deformation of the two species, the essence is not suggested as an anesthetic for the fish. Th.....