DEVICE, MOVEMENT SPEED ESTIMATION SYSTEM, FEEDING CONTROL SYSTEM, MOVEMENT SPEED ESTIMATION METHOD, AND RECORDING MEDIUM IN WHICH MOVEMENT SPEED ESTIMATION PROGRAM IS STORED

A movement speed estimation device comprises: a body length calculation unit for calculating, from a video obtained by imaging an aquatic organism with a monocular camera, an apparent body length in the video of a specific portion of the aquatic organism; a movement amount calculation unit for calculating an apparent movement amount in the video of the aquatic organism in a predetermined period of the video; and an estimation unit for estimating the movement speed of the aquatic organism on the basis of the apparent body length and the apparent movement amount.