A fish species estimating system (1) may include an acquiring module (13) and a reasoning module (13). The acquiring module (13) may acquire a data set at least including echo data generated from a reflected wave of an ultrasonic wave emitted underwater. The reasoning module (13) may estimate a fish species of a fish image included in the echo data of the data set acquired by the acquiring module (13), by using a learned model created by machine learning where the data set is used as input data and the fish species is used as teacher data.
