The main characteristic of the Bobal Sea southern coastal water (short for: coastal water) is low- er salinity, so in this paper, the salinity observed at the Peng-Lai ocean-staion is taken as an index to judge the effect of the coastal water to the Changdao Island sea area. When the effect of the coastal water is stronger, the nutrient salt content is higher, the number of plankton and the food of cultivat- ing scallops are rich in this sea area, so the scallops are growing well; the per mu yield of the scallops is higher and vice versa.
day serial near-bottom currents (at 20cm over Sea bottom) were measured in the northwest suitable breeding area near Lingshan Dao Island in order to study the potentials for the breeding environment. Statistical analysis is made for current speed frequency distribution besides harmonic analysis for these current data. The results show that the near-bottom current speeds mainly concentrate on the range of 6- 15 cm/s at frequency of 47 percent, the cumulative frequency at 25 cm/s reaches 86 percent, and maximum speed measured is 48 cm/s.
