The passive electrosense is a primitive sense in the sturgeon and paddlefish. These fishes can sense environments by detecting the weak electric fields of bioelectric and non-bioelectric origins. Nevertheless, the electrosensory function of sturgeon has always been controversial and, in the past year, has been poorly investigated. To quickly and non-invasively assess sturgeon electroreception, the behavioral responses of cultured Siberian sturgeons to underwater aluminum rods, insulated aluminum rods, and plastic rods were assessed using behavioral methods. The aluminum rod produces a weak corrosion electric field with an amplitude of 90 μV under water, whereas the insulated aluminum rod and plastic rod do not. There was no significant difference in the frequencies of rod circling for the aluminum rod, insulated aluminum rod, and plastic rod (P＞0.05). However, the sturgeon exhibited more snaps to the aluminum rod than the insulated aluminum rod and plastic rod (P＜0.01). The feeding preference intensity of the sturgeon for the aluminum rod was 2, while for the insulated aluminum rods and plastic rods it was 0.96 and 0.28, respectively. This indicates that the corrosion electric field underwater evoked a feeding response from the Siberian sturgeon. The electrosense of sturgeons may play a role in prey discrimination at the last stage of striking behavior in feeding. The results also indicate that the reaction to the corrosion electric field of metals can be used as a behavioral model to verify the electroreception in sturgeons; they also provide a new concept that may help in the conservation of sturgeons as a resource.