Betäubung von Regenbogenforellen (Oncorhynchus mykiss) mit Nelkenöl und BHA – Stressbelastung und Produktqualität

Anesthesia of Rainbow trouts (Oncorhynchus mykiss) with clove oil
and BHA – stress and product quality In the questioned experiment
three different methods of anesthesia were tested on their
influence of product quality and the possibility to minimise stress
on the rainbow trouts to be slaughtered. One group was anesthesized
by clove oil, another by BHA. Those were compared to a group
stunned by a blow on the head. The effect of stress was measured by
screening of HKT and catecholamines in the blood and by
surveillance of behaviour during anesthesia. Product quality was
judged out by sensory tests, optical examination of carcasses and
concentration of anaesthetics in the blood. All three methods of
anesthesia worked within a limited time, with no animal showing
signs of typical behaviour under stress. Blood parameters did give
hints for no or very low stress. In the mean of sensory testing a
few persons were able to detect clove taste. Carcasses showed no
sign of visible damages. All three methods of anesthesia are though
likely to carry out anesthesia of rainbow trouts for slaughter
without negative effects on product quality and in the means of
animal welfare.