钓鱼岛近海的涡旋及其与马面鲀渔场的关系
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A STUDY ON THE EDDY OFF DIADYU ISLAND AND ITS RELATIDNSHIP TD THE FISHING GRDUND DF FILEFISH (NAYODON SEFTEIVTRIONALIS GüNTHER)
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    摘要:

    本文根据1981—1984年各年春季(4月),绿鳍马面鲀产卵场的调查资料及产量统计资料,通过水温、盐度、密度σt比容偏差105δ和地转流等海况要素,对钓鱼岛近海的涡旋特征、强度、位置变化及结合渔况进行分析研究。初步认为钓鱼岛东北海区即黑潮及其分支处附近,存在一气旋型涡旋,涡旋边缘的北侧和西侧流速较小,是马面鲀的过路渔场和产卵场。春季马面鲀的产卵场基本集中在钓鱼岛近海(26°N断面)的涡旋区及其西侧边缘的近底层,水温为17—18℃,盐度为34.6—34.8‰,比容偏差105δ为270-290。若以涡旋底部的比容偏差105δ作为衡量外洋水强弱的指标,则它与上海、舟山渔业公司4—5月份的马面鲀产量之间的相关系数为0.913;与马面鲀年总产量的相关为0.812。故认为该水文要素可提供渔获量预报的一项指标。马面鲀仔鱼基本沿涡旋周围的海流逐步向东北方向漂移。

    Abstract:

    Surveys of filefish spawning ground and in combination with the strength anal the position variation of the eddy off Diavyu Tsland in Spring (April) from 19$1 to 1984 were carried out. Marine conditions such as temperature,salinity, density бt specific volume anomaly 105δ and Geostrophic current, were analysed in order to find out the reason of the formation of spawning ground and the variation of catches,and It is expected to provide a basis for fishing forecast, The principal results are as fellows: 1.There exists a cyclonic eddy in the sea area at the northeast of Diaeyu Island(26°-27°N, 124°-125°E),that is the area of Kuroshio and its branched region.The velocity ef the upwelling in the center of the eddy is in the order of about 10-4cm/s, and around it is downwelling area. Besides rotation, the Eddy moves horizontally towards northeast,and the velocity is about 0.8km a day. On the northern and western edges of the eddy,the velocity is comparatively slow, where is the passing and spawning greunds of filefiish. 2.In spring, the spawning grounds of filefish generally concentrated in the near bottom stratum of the eddy region and its edge off Diaoyu Island (26°N section ),of which the seatva#er temperature was 17-18℃, the salinity was 3.4.6-34.8‰ and the specific volume anomaly 105δ of 270-290. 3.The eddy characteristics off Diaoyu Island in 1982 and 1983 were obviously different that the yield fluctuation of these two years was influenced to a certain extent. 4.The strength and the position of the eddy off Diaoyu Tsland ( 26°N section )have variation each year during 1981-1984. Supposed. the specific volume anomaly 105δ on the bottom of the eddy is taken as an index to n3easure the strength of the ocean water, the correlational coefficient between it and the filefish production of Shanghai a ud Zhoushan Marine Fishing Compaxiies in April and May could reach 0.9i3,and that between the index and the total annual production was 0.812. So this hydrographio factor can be offered as an index for fishing prealiction. 5.Tha larvae ef filefish basically drift along the current around the eddy towards northeast gradually.

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方瑞生,郑元甲.钓鱼岛近海的涡旋及其与马面鲀渔场的关系[J].水产学报,1986,10(2):161~176

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