Assessment of the sedative effect of various anesthetics in Coregonus Peled (Gmelin, 1789) in aquaculture

¹ Irkutsk GAU, Molodezhny settlement, Irkutsk district, Irkutsk region, Russia
² Shelekhovsky Veterinary Diagnostic Center, Shelekhov, Irkutsk region, Russia
³ FGBUN Limnological Institute SB RAS, Irkutsk, Irkutsk region, Russia

^* Corresponding author: tjul78@mail.ru

Abstract

The sedative effect of four anesthetic agents in whitefish was studied. It is shown that the effect of anesthetics causes a number of consistent behavioral and physiological reactions in fish, reflecting the change in the state of their body. For most technological fish-breeding processes, it is necessary for fish to stay in a state of muscle relaxation while maintaining respiratory rhythm. These requirements are met by the sedation stage, which is observed with all types of anesthesia in peled. It has been established that the use of some of the tested drugs is incorrect in anesthesia in general in whitefish and in pelage in particular. Thus, the use of sodium thiopental is unacceptable, due to the uncontrolled suppression of the respiratory function of fish under the action of this agent. The use of lidocaine is characterized by prolonged induction, which does not correspond to the temporary norms of fish anesthesia. Among the tested drugs, propofol has sufficient anesthetic efficacy, which is confirmed by the temporary indicators of induction/ recovery, the depth and manageability of anesthesia, and low indicators of respiratory depression. Eugenol can serve as an alternative to propofol, which is cost-effective when working with mass material that requires large financial costs. In general, the choice of anesthetic and the adjustment of its doses depend on the specific task facing the fish breeder-ichthyopathologist.