Abstract
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.
