A practical system of fish size measurement

This paper proposes a practical system of the fish size measurement which is effective and simple. Because the fry we measured is very small, the main technical problem when we measure the fish size is to measure accurately without hurting them. Although the live fish can be measured directly or after anesthesia, the fry will be damaged. So we present the system of fish size measurement without any contact to them. The portable system consists of a USB camera fixed on a rod with a adjustable height and the camera will be connected to a computer for image capturing, two lights with adjustable intensity that will be used for illumination, and an image processing software we developed that will be used to calibrate and calculate the fish length and width. Finally, the actual length and width data will be recorded in an excel. Experiment and analysis are presented in this paper, which will verify the practicability and effectiveness of the system.