Abstract
Anesthesia is generally defined as the loss of sensation caused by a pharmacological agent resulting from the suppression of the nervous system. Anesthetic agents are used to reduce stress, facilitate surgical operations requiring prolonged immobilization, in transportation, classification, handling, sorting, tagging, grading, weighing, measuring, or vaccination in fish. In order to talk about an adequate level of anesthesia, signs such as loss of balance, relaxation in muscle tone, decreased respiration, and inability to respond to stimuli must be observed in the fish. A good anesthetic agent must not have toxic side effects, be able to be eliminated from the body in a short time, not have permanent physiological, immunological, or behavioral effects. In order to determine the optimal anesthesia dose, exposure time, and maximize the drug’s efficacy in fish, the size of the fish and the characteristics of the water it is in need to be determined beforehand. There are two types of commercial anesthetics, natural and synthetic. Although chemical anesthetics are commonly used for fish, there has been a recent trend towards the use of natural anesthetics due to safety, residue problems, accumulation in the fish body, and side effects. These new herbal anesthetics have more favorable properties for the health of both fish species and the people who consume them.