Abstract
To know condition of Population of the common Shrimp, Palaemon nipponensis is of primary importance in the management of the fisheries, wherefore the present investigation has been done. Two sets of materials available for the present study were taken by a kind of fixed net from 7 localities situated on the west coast of northern part of the lake Kasumigaura. One of which was captured simultaneously on November 29, 1947, the other on June 3, 1948. The distance between both extreme localities of those 7 ones about 11.5Km. Chi-square-tests were made on body-length of samples of those 7 localities. The probalilities led from the test are given in the Table 4. From the table some local groups of the shrimp-population may be seen. Remarkably enough, the localization appears stronger in case of material obtained in November and that of male.
