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The gut contents of rose bitterling consist mainly of diatoms, with a smaller proportion of crustaceans and green algae. Although flagellates are found in the gut together with diatoms, crustaceans, and green algae, they are not considered to be an important food item. Seasona lvariation in the gut composition takes place so that in October and November diatoms make 83-88% of the composition while green algae and crustaceans are found in small percentages. No difference was found in the food compositions of larval and older fish guts examined. A high percentage of empty guts were observed in fish after hours of darkness, and it is assumed that the fish is a day-active feeder that looks for food using visual cues.The compositions of the gut contents and that of the river plankton are more or less similar and it is not clear whether or not the fish show preference for any particular type of food organism.

The feeding habits of rose bitterling in the Shin Tone River.