A method of effectively promoting the growth of rainbow trout using ordinary seawater that is not deep ocean water, and providing a method of culturing and shipping at low cost. It also provides fresh rainbow trout that is cultured and shipped by this method. A method for cultivating rainbow trout, which has not been subjected to sterilization treatment, in freshwater and seawater and shipping the rainbow trout, wherein a first freshwater culture step A1 for culturing a predetermined number of rainbow trout in freshwater for two years, A first seawater aquaculture step B1 for acclimating the rainbow trout grown in the aquaculture step A1 to seawater for aquaculture, a first shipping step C1 for sequentially shipping rainbow trout grown to a size that can be shipped in the first seawater aquaculture step B1, A second freshwater aquaculture step A2 for returning the rainbow trout that has not been shipped in one shipping step C1 to freshwater for aquaculture, and a second shipping step C2 for shipping the rainbow trout grown in the second freshwater aquaculture step A2 are performed in this order. . [Selection diagram] Fig. 1
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