PROBLEM TO BE SOLVED: To be able to produce healthy fries and perform control for consuming little energy by reducing the required capacity of a device in the temperature control of fry-producing water for application of a statolith temperature-labeling, growth inhibition, or growth promotion.SOLUTION: The method for controlling the temperature of fry-producing water includes branching a supplying flow passage 10 to which stock water is supplied, into two, making one of the supplying flow passages 10A communicate with the evaporator 21 side of a heat pump 20, also making the other supplying flow passage 10B communicate with the condenser 22 side of the heat pump 20, cooling the temperature-controlling water passing through the evaporator 21 side by a set temperature difference &Deltat1 from the temperature of the stock water, heating the temperature-controlling water passing through the condenser 22 side by a set temperature difference &Deltat2 from the temperature of the stock water by the heat exchanging action of the heat pump 20 to obtain a necessary temperature difference for the statolith temperature-labeling by the sum of the absolute values of the set temperature differences &Deltat1 and &Deltat2, and outputting the temperature-controlling water passing through the evaporator 21 side and the temperature-controlling water passing through the condenser 22 side by switching at an each set time interval.COPYRIGHT: (C)2010,JPO&INPIT【課題】耳石温度標識の付与,成長抑制,成長促進のための稚魚生産水の温度制御において、健全な稚魚を生産することができ、装置の所要能力を低くしてエネルギー消費の少ない制御を行うことができる。【解決手段】原水の供給される供給流路10を2つに分岐し、その一つの供給流路10Aをヒートポンプ20の蒸発器21側に連通する共に、他の供給流路10Bをヒートポンプ20の凝縮器22側に連通し、ヒートポンプ20の熱交換作用によって、蒸発器21側を通過した調温水を原水の温度より設定温度差Δt1だけ冷却し、凝縮器22側を通過した調温水を原水の温度より設定温度差Δt2だけ加熱し、設定温度差Δt1とΔt2の絶対値の和によって耳石温度標識に必要な温度差を得て、蒸発器21側を通過した調温水と凝縮器22側を通過した調温水とを設定時間隔毎に切り替えて出力する。【選択図】図1
