Provided is a fish quality determination system that allows even a non-expert to easily determine fish quality. A fish quality determination system includes a first machine learning unit that analyzes a relationship between image data obtained by imaging a cross-section of a fish tail and an area of the fish body in the image data by machine learning, A first estimation unit that receives image data of the tail cross-section of the fish to be determined acquired by the data acquisition unit as input on the basis of the relationship analyzed by the first machine learning unit, estimates a region of the fish to be determined, and outputs an estimation result; and a second machine learning unit that, A generation unit that generates trimming image data in which an area other than the fish's body is trimmed from the image data of the cross-section of the tail of the fish...

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