Abstract
The research was conducted between 1982 and 1985 in large and small bays stretching alongthe coast of Sanriku that had their entrances on the East side. The set-nets for salmon weremainly constructed in those bays. The behaviour of the salmon schools was investigated using ascanning sonar around the four set-nets which were located in different areas of defferent bays.
Salmon schools came into the bay from the North side and moved around the bay in an anti-clockwise direction, then went out of the bay from the South side. The route of fish school wasregarded to correspond with the flow of water in the bay. The set-nets were constructed in the North and South coast of the bay, the fish route blocked by leader-nets. Salmon schools werecaught in the set-nets having been induced to enter by the leader-net.
