Сравнение на анестезиращото действие на етерично масло от лавандула върху двугодишен шаран (Cyprinus carpio, Linnaeus, 1758).

The purpose of the present study is to examine the efficacy of lavender oil (Lavandula angustifolia) by establishing the time needed for induction and recovery from anesthesia of two year old common carp (Cyprinus carpio, Linnaeus 1758). The fish have an average body weight (BW, kg) of 1.38±0.26 kg and an average total length (TL, cm) of 43.58±3.42 cm. Eight treatments are conducted with eight experimental concentrations: 0.08 ml/l^-1, 0.10 ml/l^-1, 0.12 ml/l^-1, 0.14 ml/l^-1, 0.16 ml/l^-1, 0.18 ml/l^-1, 0.20 ml/l^-1 and 0.30 ml/l^-1. For each concentration, 10 fish (five treatments with two fish) are used, a total of 80 fish for the whole experiment. Based on the results it can be concluded that at concentration of 0.30 ml/l^-1 the induction of anesthesia is the fastest (2.10±0.36 min), thus the recovery time at this concentration is the longest (5.01±0.62 min) with significant difference (P≤0.05). The lowest concentration 0.08 ml/l has no anesthetic effect on two-year old carp, the fish only reach phase 2 of uncoordinated movements. From all tested concentrations the recovery time is the shortest at concentration 0.10 ml/l^-1 – 2.61±0.42 min (P≤0.001). During the experiment, it has been established that lavender oil at concentration 0.30 ml/l-1 is most effective as anesthetic agent for two-year old common carp, which makes itl applicable in the fish farming practice. [ABSTRACT FROM AUTHOR]