PROBLEM TO BE SOLVED: To provide a pressurized water tank apparatus for rearing of deep-sea organisms, capable of easily controlling and maintaining water-pressure in the pressurized water tank to a prescribed water pressure, and enabling easy exchange of sea water in the pressurized water tank and use of the sea water by circulation.SOLUTION: The pressurized water tank apparatus for rearing deep-sea organisms has the following construction. Pressure-regulating valves 4, 9 are installed at water-feeding side and water-discharging side of the pressurized water tank 1, respectively. The pressure-regulating valve 4 at the water-feeding side is set to a level slightly higher than a predetermined water-pressure in the water tank, and the pressure-regulating valve 9 at the water-discharging side is set to a level equal to the predetermined water-pressure in the water tank. Materials precipitating in the water tank such as feces of the deep-sea organisms and residues, etc., of feeds supplied from a feeder 13 are discharged from the water tank together with a part of the sea water in the water tank taking advantage of the pressure difference generated by the pressure-regulating valves 4, 9 at the water-feeding side and the water-discharging side. The sea water discharged from the pressurized water tank is sent to a water-receiving tank 3 composed of a filter tank 11 and a cooling tank 12, the clean sea water in the water-receiving tank is pumped up by a pressurizing pump 2, and the pressurized sea water is supplied to the pressurized water tank.【課題】加圧水槽内の水圧を所定水圧に簡便に調整維持することができる共に加圧水槽内の海水交換も容易にできさらに海水を循環使用できるようにした深海性生物の飼育用加圧水槽装置を提供する。【解決手段】加圧水槽１の給水側と排水側にそれぞれ圧力調整弁４，９を設け、給水側の圧力調整弁４を水槽内の所定水圧より若干高めに設定し、排水側の圧力調整弁９は水槽内の所定水圧と同圧に設定して、給水側と排水側の圧力調整弁４，９による圧力差を利用することにより、水槽内に沈降する深海性生物の糞や給餌器１３から供給された餌等の残渣などを水槽内の海水の一部と共に水槽外に排水し、加圧水槽外に排水された海水はろ過槽１１と冷却槽か１２らなる受水槽３に送られびこの受水槽内の清浄な海水を加圧ポンプ２で汲み上げて加圧水槽内に高圧の海水を供給する深海性生物の飼育用加圧水槽装置。【選択図】図１
