Abstract
The cockles, Fulvia mutica, caught in Miyazu Bay, Kunda Bay and Maizuru
Bay, Kyoto prefecture, grow up nearly 10 cm of shell height that is about 1.5 times
as big as cockles caught in other sea area. Individual numbers of the cockles caught
in Kyoto prefecture, however, have fluctuated from 0 to 60,000 and in recent years
the number is less than 10,000.
In order to increase the yield of cockle, we have established the methods for
seed production and cultivation of cockle. Furthermore, we tried to develop the
breeding technique of cockle. In the present study, it was cleared that the shell
length and weight of whole body of Fl hybrid were significantly larger than those
of inbred parents.
