Problem to be solved: to provide an oxygen supply apparatus capable of requiring the backup of oxygen supply to the rearing water without taking any cost in an emergency such as when power failure occurs or when dissolved oxygen concentration of the rearing water is reduced due to some trouble.Solution: the oxygen supply apparatus for supplying oxygen to the rearing water 7 in the aquaculture tank 6 in the aquaculture has an oxygen bomb 1 having an original valve 2, and an electromagnetic valve 3 provided at the outlet side of the oxygen bomb 1, and the original valve 2 is always \"open\" and the solenoid valve 3 is energized when it is energized An oxygen supply device which provides an \"open\" oxygen supply when the oxygen supply is kept closed and the oxygen supply is stopped.Diagram【課題】本発明は、停電時や、何らかのトラブルにより飼育水の溶存酸素濃度が低下した時等の緊急時に、コストをかけずに、飼育水に酸素供給のバックアップを要すことができる酸素供給装置を提供することを目的とする。【解決手段】陸上養殖の飼育水槽6中の飼育水7に酸素を供給するための酸素供給装置であって、元弁2を有する酸素ボンベ1と、前記酸素ボンベ1の出口側に設けられた電磁弁3と、を有し、前記元弁2は、常時「開」であり、前記電磁弁3は、通電時は「閉」となって酸素供給を待機させ、非通電時に、「開」となって酸素を供給する酸素供給装置。【選択図】図2
