Fish count calculation method, fish count calculation program, and fish count calculation device

A non-transitory computer-readable storage medium storing a program for causing a computer to:

• construct an estimator for estimating a number of fish present in a pen through machine learning using, as training data, a plurality of training data sets, each of which includes a training echo image based on sound waves received upon being reflected by the fish when sound waves are transmitted in the pen in which the fish travel within the pen, and the number of fish present in the pen in the training echo image;
• and
• calculate an unknown number of fish present in a real pen by using the estimator on a real echo image generated based on sound waves that are transmitted in the real pen and received upon being reflected by the unknown number of fish present in the real pen,
• wherein a plurality of training echo images included in the plurality of training datasets include a simulated echo image generated using numerical simulation of fish behavior, the numerical simulation generating sound waves reflected from a predetermined number of fish traveling in a school within the pen.

A fish count calculation apparatus, comprising:

• a processor configured to:
• construct an estimator for estimating a number of fish present in a pen through machine learning using, as training data, a plurality of training data sets, each of which includes a training echo image based on sound waves received upon being reflected by the fish when sound waves are transmitted in the pen in which the fish travel within the pen, and the number of fish present in the pen in the training echo image;
• and
• calculate an unknown number of fish present in a real pen by using the estimator on a real echo image generated based on sound waves that are transmitted in the real pen and received upon being reflected by the unknown number of fish present in the real pen,
• wherein a plurality of training echo images included in the plurality of training datasets include a simulated echo image generated using numerical simulation of fish behavior, the numerical simulation generating sound waves reflected from a predetermined number of fish traveling in a school within the pen.