Abstract
The drilling work of the ear-hanging scallop culture (Patinopecten yessonsis, Jay) makes many mechanical
injuries of the mantle.
In order to reveal the relationships between the drilling positions and the mechanical injuries, the investigation
of the mantle shape at the workshop and the drilling test to the eight positions on the ear part of juvenile
scallop (shell hight : 62 -76mm) was conducted. And then the scar on the mantle was exanined by dissecting the
sample shells.
The results have been shown as the following: 1) Most of the scallops was expanding the mantle to the drilling area 2) the scars were divided into four types of mechanical injury 3) the frequency of the injury-types
largely differed depending on the drilling positions.
