To illustrate the characteristics of marine environment in coastal waters of stationary fisheries, field observations were carried out in August and November, 2001. Water temperatures in Jindong Bay compared with those in Masan Bay were about higher in August and about in November. Salinities were lowest in the western part of Jindong Bay. It was found that salinity increased gradually from the western part of Jindong Bay to Masan Bay. Sea water in Masan Bay can be characterised as lower temperature and higher salinity, compared with those in Jindong Bay. Concentrations of suspended solids in the inner parts of Jindong Bay were higher than 15mg/L in August. Suspended solids in both regions of Jindong Bay and Masan Bay showed contrastive distributions, especially in November. That is, higher concentrations of suspended solids were found in the inner parts of Jindong Bay and off Masan Bay. Concentration of chemical oxygen demand in Masan Bay was highest, 7mg/L.
This study described relationships between fluctuation of fishing conditions for common squid and oceanic conditions in the East Sea from 1990 to 1999. Annual catches of common squid have been higher since the late 1980s compared to the period of the late 1970s to the mid-1980s. These catches fluctuations might be related to the effect of regime shifts. Monthly catches of common squid appear the timing of a large catch from September to December and a poor catch from March to May. The monthly catches are also the highest in October and are the lowest in April. Annual stable fishing grounds for coefficient of variation below 1.0 are formed in waters around Guryongpo and Ullung Island Based on optimum water temperature for catch, , optimum water depth for catch shallow going north. It indicates that the optimum water depth of fishing work different of each area Fishing ground formation and horizontal water temperature appear the minimum in April, the maximum in October. If seem, that seasonal fluctuation of fishing ground is related to the extension of the Tsushima warm current in the East Sea.
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