PROBLEM TO BE SOLVED: To provide an aquarium for live fish and shells, which has an inexpensive structure and can suppress a rise in water temperature for a long time. A water tank (1) is provided with a water storage chamber in which live fish and shellfish are stored, an air supply device (A) for containing air in the water in the water storage chamber, and a cooling device (3) for cooling the water in the water storage chamber. The cooling device 3 includes a cooling chamber 31b in which the cold insulating agent 34 is stored, a water supply pump 6 that feeds the water in the water storage chamber to the cooling chamber 31b, and the water fed to the cooling chamber 31b in the form of a shower or a mist. From the water supply pipe 13 for spraying and contacting the cold storage agent 34, the return flow path 14 for returning the water contacting the cold storage agent 34 to the water storage chamber, the temperature sensor 8 for measuring the water temperature in the water storage chamber, and the temperature sensor 8 When a signal is input and the water temperature in the water storage chamber is lower than a predetermined temperature, the water supply pump 6 is maintained in a drive stopped state, and when the water temperature in the water storage chamber rises to a predetermined temperature, a thermo switch 9 for driving the water supply pump 6 is provided. Prepare [Selection diagram] Fig. 3【課題】安価な構成で長時間にわたって水温が上昇するのを抑えることができる活魚介類用の水槽を提供する。【解決手段】水槽１は、活魚介類が収容される貯水室と、貯水室内の水にエアを含ませるエア供給装置Ａと、貯水室内の水を冷却する冷却装置３とを備える。冷却装置３は、保冷剤３４が収容される冷却室３１ｂと、貯水室内の水を冷却室３１ｂに送給する給水ポンプ６と、冷却室３１ｂに送給された水をシャワー状又は霧状に散布させて保冷剤３４に接触させる給水管１３と、保冷剤３４に接触させた水を貯水室に戻す戻り流路１４と、貯水室内の水温を測定する温度センサ８と、温度センサ８からの信号を入力として、貯水室内の水温が所定温度よりも低いと、給水ポンプ６を駆動停止状態に維持し、貯水室内の水温が所定温度に上昇すると、給水ポンプ６を駆動させるサーモスイッチ９とを備える。【選択図】図３
