To provide an anesthetization method of fish and shellfish capable of expressing earlier an anesthetic effect to the fish and shellfish； and to provide a production method of anesthetic water.SOLUTION: Anesthetic water is produced by a step for adjusting a salinity concentration corresponding to an anesthetic object, to water, and further adjusting it to a carbon dioxide concentration showing an anesthetic effect. As a sample of an adjustment method of the salinity concentration, there is a method for adjusting so as to be brought close to an osmotic pressure of a body fluid of the anesthetic object.SELECTED DRAWING: None【課題】魚介類に対し、麻酔効果をより早期に発現可能な、魚介類の麻酔方法および麻酔水の製造方法の提供。【解決手段】水に対し、麻酔対象に応じた塩分の濃度調整を行うとともに、さらに麻酔効果を奏する二酸化炭素濃度へ調整する工程によって麻酔水を製造する。塩分濃度の調整方法の一例としては、麻酔対象の体液の浸透圧に近づけるように調整する方法がある。【選択図】なし
