Abstract: A breeding apparatus comprises a main water tank 10 in which deep-sea organisms are housed along with seawater; a hot water supplying device 20; and a hot water discharging device 30. A hot water pipe 22 extends from a hot water tank 21 to the bottom of the main water tank 10, an end configuring a spouting hole 22a which emits hot water upwardly. The hot water discharging unit 30 is positioned above the spouting hole 22a and circulates the hot water ascended from the spouting hole 22a back to the warm water tank 23, which is outside of the main water tank 10, via a hot water discharging pipe 31. The hot water emitted from the spouting hole 22a forms a cold water zone 12 and a localized hot water zone 11, while the interface between this hot water zone 11 and the cold water zone 12 is formed in a rapidly ascending fashion in respect to the vertical cross section of the seawater in the main water tank 10.