Investigations of anaesthetic effect of Eugenol ("Aqui-S") and chemical similar structured compounds on eel (Anguilla anguilla).

Investigations of anaesthetic effect of Eugenol ("Aqui-S") and chemical sim ilar structured compounds on eel (Anguilla anguilla). A comparison of the a naesthetic effect on eels (Anguilla anguilla) between the commercially avai lable eugenol (4-allyl-2-methoxyphenole or 2-methoxy-4-propylphenole respec tively; "Aqui-S") and the chemically similar structured antioxidants BHA (2 -tert.-butyl-4-methoxyphenole) and BHT (2,6-di-tert.-butyl-p-cresole) showe d, that BHA exerted the strongest effect. Eugenol ("Aqui-S") and BHA are bo th useful for breakdown of stress during transportation or keeping in tanks of eels, but not suitable for industrial stunning/slaughtering of eels. De slimin process of eels was optimal, when a special mixing and rotating mach ine (tumbler construction or mixer principe) with the following parameters were used: addition of 3 % of a saturated chalk milk solution (Ca(OH)(2)), 10 % soda or 0,3 % ammonia solution (ratio of alkaline solutions : eels = 3 : 97); 10 r. p. m.; desliming time 10 minutes. The use of the desliming ag ent chalk milk has ecological and economical advantages. The desliming toss was between 5 and 6 %.