抄録
In 1996, the Japanese government enacted “The law for the preservation and management of marine
fisheries resources” and introduced a Total Allowable Catch （TAC） management system for walleye
pollock, Japanese common squid, Pacific saury, and other species. This will require more accurate
estimates of stock abundance and better management methods. Acoustic techniques using scientific
echosounders are one way to estimate the distribution and abundance of fish. Such techniques are
commonly used, especially in Northern Europe and North America, because they can survey large areas
of ocean relatively quickly. However, before such surveys can be conducted, the acoustic characteristics
of the target species must be known. In Japan, acoustic techniques are not often used because there are
many species in the waters around Japan. Many studies have examined the acoustic characteristics of
commercial aquatic organisms. However, it is difficult to estimate their abundance using only the acoustic
characteristics of those organisms because many non-commercial aquatic organisms also live in the sea.
Therefore, in this study, I determine the acoustic characteristics of non-commercial aquatic organisms to
facilitate the use of acoustic techniques in the waters around Japan. This paper is a representative study.
