PROBLEM TO BE SOLVED: To provide a surfacing tank that enables use of the tank in a region without abundant water resources.SOLUTION: A surfacing tank includes: a hatching growing room 10A where a water flow is formed from a lower part toward an upper part in a body frame 10； a water supply flow path 13 having a water inlet 13A for supplying water from the lower part to the hatching growing room 10A； a drainage flow path 12 for draining the water passing the hatching growing room 10A； a circulation reservoir tank 30 for storing the water drained through the drainage flow path 12； and circulation means 40 for circulating the water pumped up from the circulation reservoir tank 30 to the water supply flow path 13. A portion of water drained is discharged from the circulation reservoir tank 30 through the drainage flow path 12, and the raw water of the same flow rate as the flow rate of water discharged from the circulation reservoir tank 30 is added to the water supply flow path 13.SELECTED DRAWING: Figure 1
