The Monthly And Interannual Variability In Distribution Of Fishing Grounds Of The Spanish Mackerel. Scomberomorus Niphonius (Cuvier Et Valenciennes) In Bohai Sea, Yellow Sea And East China Sea

Based on the Spanish mackerel's monthly catch and the catch per unit effort(CPUE) data in Bohai Sea,Yellow Sea and East China Sea in1979～1982,the law of the Spanish mackerel in the spawning,reproduction and feeding different life stages of resource distribution and migratory movements in Bohai Sea,Yellow Sea and East China Sea was understand and grasped,and the characteristics on the distribution of fishing ground and interannual variability of the Spanish mackerel was discussed,the relationship in the catches of the Spanish mackerel in Bohai Sea,Yellow Sea and East China Sea and sea surface temperature(SST),sea surface salinity(SSS),and the relationship in the catch per unit effort(CPUE) and SST,SSS were analyzed,combined with the temperature and salinity data derived by the ROMS which was the three～dimensional and Non～linear baroclinic primitive equation model.The impact on the distribution in the fishing ground of Spanish mackerel by SST and SSS,and the forming reasons in the monthly and interannual variability of the the group distribution of the Spanish mackerel were explored,to provide the theoretical basis on the fishery production and the related researches of the Spanish mackerel and played a rule in the arrangements for the production of marine fish and the protection of resources of the Spanish mackerel.The distribution of catch and CPUE in the 1973～1982 decade reflected the migratory trend in the winner of the Spanish mackerel.Before and after in early September,the fish began to go away Bohai Sea for temperature migratory,and some fish had entered the northern of the Yellow Sea,feeding in the 20～30m depth of the waters;in early October and mid～October,the main group of the Spanish mackerel began to move to south,and mainly located in the north～central of Yellow Sea and feeded in the 30～40m depth of the waters;In November,the fish had moved to south and mainly distributed in central and southern of Yellow Sea in the 40m depth, followed by the water temperature of Yellow Sea dropped.There was little or no fish in the northern of Bohai Sea and Yellow Sea at the same time.In the mid～December and late December,the fish returned successively to the winter games in the open sea of the southern Yellow Sea or the open sea of East China Sea,moving after Changjiangkou fishing ground and the Dasha fishing ground.The distribution of catch and CPUE in the 1973～1982 decade showed that,the distribution in the Spanish mackerel's fishing grounds had close relation in the variation of SST,SSS in Bohai Sea,Yellow Sea and East China Sea.In April,1973,there were strong forces in the Taiwan Warm Current and Southeast winds over large frequency (37%),the location of center for fishing grounds of Spanish mackerel biased northwest in this year;in 1976,1979 and 1982,affected by El Nino,the Sea surface temperature of Bohai Sea and Yellow Sea was higher than the previous years,the water temperature dropped down,following the speed of the Southward winter migration of the Spanish mackerel slow down,the location of center for fishing grounds biased north; In December,1979,the salinity gradient of the central coast of Yellow Sea was larger than the other years,the Spanish mackerel had high CPUE near the HaiZhou Bay fishing ground.Understanding of Spanish mackerel's distribution and the law of the movement of fishing grounds in Bohai Sea,Yellow Sea and East China Sea had positive and practical significance in the protection of the Spanish mackerel resources,the maintainment of its production scale,the stability of its fishing production and the rational development and utilization of the Spanish mackerel's resources.