Broadband target strength measurements of juvenile walleye pollock (Theragra chalcogramma)

Walleye pollock (Theragra chalcogramma) is one of very important fisheries resources in Japan. The acoustic-net surveys have been conducted around Hokkaido since 1995. To improve the present resource management, the estimation of the standing stock of juvenile walleye pollock is necessary. The target strengths of juvenile walleye pollock at 38 kHz have been well-studied through measurement. However, there are little knowledge of the target...