We developed an effective aquaculture production management system that can measure the body length, weight, and number of cultured fishes in a tank or cage in a non-contact manner. A threedimensional measuring system that employs two commercialized video cameras was produced to measure the body size of cultured fish, including their fork length, body height, and width. The distance between the video cameras and target fish was less than five meters to reduce the error ratio. In addition, an automatic counting system for cultured fish in a tank was developed to assist in efficient aquaculture management. Finally, an algorithm for fish counting was based on estimating the mobile vectors of individual fish, in which the particle tracking velocimetry （PTV） analytical method was applied. In some experimental cases, estimated numbers by the system were coincident with actual numbers.
